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1
Tripathi, Anshul, Sahil Thakur, and Tushar Aggarwal. "Modal and Static Analysis of Vortex Bladeless Wind Turbines with Different Geometries." E3S Web of Conferences 430 (2023): 01254. http://dx.doi.org/10.1051/e3sconf/202343001254.
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The renewable energy industry has undergone remarkable growth in recent times, with wind energy assuming a preeminent role as a source of clean energy. Five distinctive geometries were analyzed, including a traditional circular form, a decagonal form, and three sinusoidal forms to evaluate the modal and structural characteristics of vortex bladeless wind turbines. The ANSYS software was employed to carry out both the modal and structural analysis. The vortex bladeless rod was firmly fixed and the mast was exposed to a wind pressure of 15 Pa during modal analysis. The structural analysis was executed to compute the deflection of the vortex bladeless wind turbine under the same wind pressure. The results demonstrated that the sinusoidal forms exhibited the greatest deflection at a wind speed of 5m/s. These findings possess the potential to optimize and augment the design of vortex bladeless wind turbines, provide guidance for future design decisions, and boost the efficiency and dependability of these wind turbines. It is therefore posited that the consideration of diverse geometries in the design of vortex bladeless wind turbines is of paramount importance, and the findings of this study are expected to be of great use to engineers and designers in the wind energy field, thereby catalyzing the progression of this thriving renewable energy source.
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Sudarshan, TA, P. Bhavya, B. C. Manjesh, et al. "A renovative design and fabrication of vortex bladeless windmill." Journal of Physics: Conference Series 2426, no. 1 (2023): 012059. http://dx.doi.org/10.1088/1742-6596/2426/1/012059.
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Abstract The issues produced withinside the traditional windmills instigate the development of vortex bladeless windmills. Vortex Bladeless is a vortex caused vibrations resonant wind generator. It harnesses wind strength from a phenomenon of vorticity referred to as Vortex Shedding. Basically, Bladeless era consists of a cylinder regular vertically with an elastic rod. The cylinder oscillates on a wind range, which then generates electricity through a trade system. In exclusive words, its wind generators which is not genuinely a turbine. In other words, wind turbines are not real turbines. In this current paper we have tried to upgrade the Vortex windmill which is more comparable to solar panels in terms of functionality and cost-effectiveness compared to everyday wind turbines and entire project uses less planetary area. Through the improvised model we look forward to produce 238.60Wh of power. The work is designed in such a manner that it can be portable i.e., can be carried from one place to another.
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Prafull, Navkar *1 Rushikesh Sable 2. Mayur Satputale. "VORTEX BLADELESS TURBINE GYRO E-GENERATOR." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 7, no. 2 (2018): 189–92. https://doi.org/10.5281/zenodo.1165914.
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Vortex-Bladeless is a Spanish SME whose objective is to develop a new concept of wind turbine without blades called Vortex or vorticity wind turbine. This design represents a new paradigm in wind energy and aims to eliminate or reduce many of the existing problems in conventional generators. The bladeless vortex turbine is one such concept that uses the principle of aero-elasticity and thereby the variations produced by it to generate electricity. Project work will include the design and development of a vortex wind bladeless turbine and a gyro-action based e-generator to be coupled to it to generate the electricity. Prototype development will be done using 3-D printing for the vortex turbine and the e-generator to make a scaled working model that will demonstrate electricity generation and testing will be done on the same to determine the effect of wind speed on , turbine speed , voltage , current and power generated by the model.
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Badri, Nithin, Vamshi Peddolla, Hutchinson Gottumukkala, Jyothi U.S., and Aparna S. "Design and Analysis of Bladeless Wind Turbine." E3S Web of Conferences 391 (2023): 01040. http://dx.doi.org/10.1051/e3sconf/202339101040.
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The idea of bladeless windmills is based on the vortex shedding effect hypothesis. A wind-powered generator with the fewest moving elements is the vortex bladeless windmill. The oscillation or vibration caused by the wind is used to generate the electric current. As a result, piezoelectric material or a linear alternator are used to generate electricity. In this project effort, we attempted to increase the vortex-induced vibrations of the turbine built of Epoxy Carbon UD (230GPa) by altering the design of the mast and base. The maximum deflection is 0.22775m (condition 7) at 10 m/s2 acceleration.
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Onkar, D. Kshirsagar, and B. Gaikwad Amol. "Design and Analysis of Vortex Bladeless Windmill for Composite Material." Journal of Industrial Mechanics 4, no. 2 (2019): 15–24. https://doi.org/10.5281/zenodo.3355094.
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Nowadays, the non-renewable energy sources are gone to depth of the earth, so we obviously need to produce energy by using renewable energy sources. The traditional blade wind turbines are used to produce energy but its cost is very high and it have many disadvantages like as capital cost, maintenance cost, running cost, friction loss and it is also dangerous to birds and is noisy as well. Hence, there is a need to find low-priced and safe replacement to conventional windmills. The concept of bladeless windmill works on the theory of vortex shedding effect. Vortex bladeless windmills are a wind powered generator that generates electricity with minimum moving parts. It generates the electric current by using the oscillation or vibrations produced due to the wind. It’s working principle of vortex-induced vibrations (VIV). Hence, the electricity is generated by using linear alternator or piezoelectric material. Generally, structures are designed to minimize vortex-induced vibrations (VIV) in order to minimize mechanical failures. But in this project work, we try to increase the vortex-induced vibrations (VIV) with maximum deflection of bladeless windmills which is used to produce electricity with experimental and geometrical approach.
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Kumar, K. Sunil. "Design and Fabrication of Vortex Bladeless Windmill." International Journal for Research in Applied Science and Engineering Technology 6, no. 3 (2018): 2407–10. http://dx.doi.org/10.22214/ijraset.2018.3386.
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Paul Austin Sylvanus ert al.,, Paul Austin Sylvanus ert al ,. "Design and Optimization of Vortex Bladeless Turbine." International Journal of Industrial Engineering & Technology 9, no. 1 (2019): 63–68. http://dx.doi.org/10.24247/ijietjun20196.
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Vishal, Digambar Bodkhe. "Design and Development of Vortex Blade less Wind Turbine." International Journal of Trend in Scientific Research and Development 2, no. 3 (2018): 2460–62. https://doi.org/10.31142/ijtsrd12804.
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Vortex Bladeless is a Spanish SME whose objective is to develop a new concept of wind turbine without blades called Vortex or vorticity wind turbine. This design represents a new paradigm in wind energy and aims to eliminate or reduce many of the existing problems in conventional generators. Due to the significant difference in the project concept, its scope is different from conventional wind turbines. It is particularly suitable for offshore configuration and it could be exploited in wind farms and in environments usually closed to existing ones due to the presence of high intensity winds. The main objective of this SHAPE project is to develop the needed tools to simulate Fluid Structure Interaction FSI problems and to reproduce the experimental results for scaled models of the Vortex Bladeless device. In order to do so the Alya code, developed at the Barcelona Supercomputing Center, is adapted to perform the Fluid Structure Interaction FSI problem simulation. Vishal Digambar Bodkhe "Design and Development of Vortex Blade less Wind Turbine" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-3 , April 2018, URL: https://www.ijtsrd.com/papers/ijtsrd12804.pdf
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Bahadur, Issam. "Dynamic Modeling and Investigation of a Tunable Vortex Bladeless Wind Turbine." Energies 15, no. 18 (2022): 6773. http://dx.doi.org/10.3390/en15186773.
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This paper investigates the dynamics of an electromagnetic vortex bladeless wind turbine (VBWT) with a tunable mechanism. The tunable mechanism comprises a progressive-rate spring that is attached to an oscillating magnet inside an electromagnetic coil. The spring stiffness is progressively adjusted as the wind speed changes to tune the turbine fundamental frequency to match the shedding frequency of the vortex-induced vibration (VIV) due to the wind flow crossing over the oscillating mast. Coupled nonlinear equations of motion of the tunable turbine are developed using the lumped-mass representation and Lagrange formulation. Numerical results show that the tunable turbine performs effectively beyond a threshold wind speed. An analytical expression of the threshold speed is derived based on the mechanical fundamental frequency of the turbine. The analytical results are in reasonable agreement with the numerical evaluations. At a given wind speed past the threshold, the tunable turbine has an optimum spring stiffness at which the output power is maximum. Numerical studies also show that the output power of the 2 m long tunable turbine is tens of times larger in comparison to a conventional bladeless turbine. For example, at a wind speed of 4.22 m/s, the output rms power of the tunable turbine is around 1105 mW versus 17 mW of the conventional VBWT. The power can be further maximized at an optimum external load. This research work demonstrated the feasibility and merits of the proposed tunable mechanism to enhance the overall performance of the bladeless wind turbine.
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Gauri, Sanket. "Hybrid Vortex Piezoelectric Bladeless Wind and Solar Power Generation." International Journal for Research in Applied Science and Engineering Technology 13, no. 4 (2025): 5063–66. https://doi.org/10.22214/ijraset.2025.69288.
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This project investigates an innovative hybrid system for electrical power generation, combining bladeless wind turbine technology with piezoelectric materials and solar power. The bladeless wind turbine harnesses vibrations and oscillations, rather than traditional rotational motion, to generate electricity through integrated piezoelectric components. This method eliminates the need for wind input power, making it highly adaptable to low-wind environments. The system further incorporates solar panels, which store energy in batteries, ensuring a consistent and reliable power supply regardless of weather conditions. The integration of these two renewable energy sources piezoelectricity and solar power creates a robust, non- conventional energy generation system. This hybrid approach not only maximizes energy capture but also enhances overall efficiency by leveraging both wind and solar resources. The primary goal of this project is to advance the sustainability, economic viability, and environmental benefits of non- conventional energy solutions. By utilizing cutting-edge technologies, the system aims to reduce dependence on traditional energy sources, minimize environmental impact, and contribute to the global transition toward renewable energy.
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Mohammadi, N., M. Mohammadi, and A. A. Jafari. "Vortex-Induced Vibrations Analysis of FGM Bladeless Wind Turbines." Journal of Applied Nonlinear Dynamics 13, no. 03 (2024): 475–89. http://dx.doi.org/10.5890/jand.2024.09.005.
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Kang, Heeyun, Jinho Kook, Jaeyoung Lee, and Young-Keun Kim. "A Novel Small-Scale Bladeless Wind Turbine Using Vortex-Induced Vibration and a Discrete Resonance-Shifting Module." Applied Sciences 14, no. 18 (2024): 8217. http://dx.doi.org/10.3390/app14188217.
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The bladeless wind turbine (BWT) using vortex-induced vibration is a new class of wind turbine that does not have traditional rotating blades and converts wind energy into vibration energy and into electrical energy based on vortex-shedding principles. Since conventional BWTs are only efficient for a small range of wind speeds near the structural resonant frequency, this study proposes a novel bladeless wind turbine that can tune the resonant frequency for a wider range of wind speeds to improve the effective power generation region. This study designed a discrete on–off resonance-shifting module based on a smart material with variable stiffness that can easily tune the structural frequency of the BWT to two different wind speed classes to enhance power generation efficiency. Experiments were conducted to confirm that the designed BWT can shift the resonant frequency of the structure by 60% and can operate in the ranges of light breezes and gentle breezes. Furthermore, a series of experiments present the power generation effectiveness of the proposed BWT under these different wind speed conditions.
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Eldawy, Reham S., Ashraf A. Ghorab, and Moustafa M. ,. Sayed. "A State-of-the-Art Review on Vortex Induced Vibrations Phenomenon Bladeless Wind Turbine Technology." Journal of Scientific Research and Reports 30, no. 11 (2024): 1045–56. http://dx.doi.org/10.9734/jsrr/2024/v30i112631.
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Vortex bladeless wind turbine (VBWT) is a new wind power extraction technology that is dependent on the Aero-elasticity phenomenon that is called vortex induced vibrations – VIV – which is derived from the study of flow induced vibrations, it is the phenomenon that arises from the interaction of inertial, structural and aerodynamic forces over a bluff body. it has been found that when Air – ideal gas - flows around a body an induced oscillatory motion can be established by vortex shedding. By leveraging the induced oscillatory motion resulting from VIV, Vortex Bladeless aims to generate power in a novel way. The absence of traditional blades sets this technology apart from conventional wind turbines and introduces different dynamics in the extraction of wind energy. VBWT devices are particularly advantageous in low to moderate wind situations, where traditional turbines may prove inefficient or unfeasible. Moreover, their reduced noise levels and compact size render them suitable for urban or ecologically sensitive regions. The selection of this new technology to be investigated and studied will play an important role in wind energy field of study opening a new chapter in the development of this kind of renewable energy, leading to generate power with a lesser cost than that produced by the conventional wind turbines by 40 %. Nonetheless, the efficacy of VBWT may be constrained in high-wind conditions where conventional turbines thrive, and their performance is significantly influenced by certain design and resonance attributes.
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A, Nivedhitha. "A Review of Vortex Bladeless Wind Turbine and Vorticity Effects." International Journal for Research in Applied Science and Engineering Technology 8, no. 11 (2020): 198–201. http://dx.doi.org/10.22214/ijraset.2020.32113.
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Cann, Matthew, Ryley McConkey, Fue-Sang Lien, William Melek, and Eugene Yee. "Mode classification for vortex shedding from an oscillating wind turbine using machine learning." Journal of Physics: Conference Series 2141, no. 1 (2021): 012009. http://dx.doi.org/10.1088/1742-6596/2141/1/012009.
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Abstract This study presents an effective strategy that applies machine learning methods to classify vortex shedding modes produced by the oscillating cylinder of a bladeless wind turbine. A 2-dimensional computational fluid dynamic (CFD) simulation using OpenFOAMv2006 was developed to simulate a bladeless wind turbines vortex shedding behavior. The simulations were conducted at two wake modes (2S, 2P) and a transition mode (2PO). The local flow measurements were recorded using four sensors: vorticity, flow speed, stream-wise and transverse stream-wise velocity components. The time-series data was transformed into the frequency domain to generate a reduced feature vector. A variety of supervised machine learning models were quantitatively compared based on classification accuracy. The best performing models were then reevaluated based on the effects of artificial noisy experimental data on the models’ performance. The velocity sensors orientated transverse to the pre-dominant flow (u y ) achieved improved testing accuracy of 15% compared to the next best sensor. The random forest and k-nearest neighbor models, using u y , achieved 99.3% and 99.8% classification accuracy, respectively. The feature noise analysis conducted reduced classification accuracy by 11.7% and 21.2% at the highest noise level for the respective models. The random forest algorithm trained using the transverse stream-wise component of the velocity vector provided the best balance of testing accuracy and robustness to data corruption. The results highlight the proposed methods’ ability to accurately identify vortex structures in the wake of an oscillating cylinder using feature extraction.
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Rusianto, Toto, Sudarsono, Samuel Kristiyana, and Yuli Purwanto. "Performance Characteristics of Vortex Wind Turbines with The Computational Fluid Dynamics (CFD) Aided Simulation." E3S Web of Conferences 605 (2025): 01004. https://doi.org/10.1051/e3sconf/202560501004.
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The purpose of this paper present research on vortex wind turbines that is referred to as wind turbines without propellers or bladeless. The innovation of the vortex lies in its unique shape and the way it harnesses energy through oscillating motion. The mast column oscillates with the wind, harnessing the von Karman vortices generated as the fluid passes through the column structure. This paper presents the results of computational fluid dynamics (CFD) simulations of a vortex wind turbine with 6 and 7 inch diameter cylinders at various wind speeds. The voltage generated by a vortex wind turbine with a cylinder diameter of 6 inches was measured under realistic conditions to evaluate the wind turbine’s performance in terms of output power generator due to vortex generation. The result of the research show wind speeds as low as 5 m/s that the vortex wind turbines may already exhibit generator-induced oscillations. Vibrations can be obtained using either CFD simulations or measurement results in actual conditions that the vibrations can generate a generator to produce electric voltage.
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Yazdi, E. Azadi. "Nonlinear model predictive control of a vortex-induced vibrations bladeless wind turbine." Smart Materials and Structures 27, no. 7 (2018): 075005. http://dx.doi.org/10.1088/1361-665x/aac0b6.
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González-González, Enrique, David J. Yáñez, Arturo Hidalgo, Susana Del Pozo, and Susana Lagüela. "3D-Printed SMC Core Alternators: Enhancing the Efficiency of Vortex-Induced Vibration (VIV) Bladeless Wind Turbines." Applied Sciences 14, no. 13 (2024): 5512. http://dx.doi.org/10.3390/app14135512.
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This study investigates the application of soft magnetic composite (SMC) materials in alternator core manufacturing for bladeless wind turbines operating under the principle of vortex-induced vibration (VIV), employing additive manufacturing (AM) technologies. Through a comparative analysis of alternator prototypes featuring air, SMC, and iron cores, the investigation aims to evaluate the performance of SMC materials as an alternative to the most commonly used material (iron) in VIV BWT, by assessing damping, resonance frequency, magnetic hysteresis, and energy generation. Results indicate that while alternators with iron cores exhibit superior energy generation (peaking at 3830 mV and an RMS voltage of 1019 mV), those with SMC cores offer a promising compromise with a peak voltage of 1150 mV and RMS voltage of 316 mV, mitigating eddy current losses attributed to magnetic hysteresis. Notably, SMC cores achieve a damping rate of 60%, compared to 67% for air cores and 59% for iron cores, showcasing their potential to enhance the efficiency and sustainability of bladeless wind turbines (BWTs). Furthermore, the adaptability of AM in optimizing designs and accommodating intricate shapes presents significant advantages for future advancements. This study underscores the pivotal role of innovative materials and manufacturing processes in driving progress towards more efficient and sustainable renewable energy solutions.
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Ordoñez, Orlando, and A. Reyes Duke. "Wind Resource Assessment: Analysis of the Vortex Bladeless Characteristics in Puerto Cortés, Honduras." IOP Conference Series: Earth and Environmental Science 801, no. 1 (2021): 012019. http://dx.doi.org/10.1088/1755-1315/801/1/012019.
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Saengsaen, Sirada, Chawin Chantharasenawong, and Tsung-Liang Wu. "A 2–D Mathematical Model of Vortex Induced Vibration Driven Bladeless Wind Turbine." MATEC Web of Conferences 291 (2019): 02007. http://dx.doi.org/10.1051/matecconf/201929102007.
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Bladeless wind turbine (BWT) is a flexible cylindrical structure that extracts energy from wind by utilising vortex-induced vibration (VIV) - aerodynamic forces and the resulting structural vibration. This work focuses on taking possible advantage of the increase in lift forces in the similar fashion to birds flying in a V-formation. The purposes of the present study are 1) to study the flow pattern and characteristic around two BWTs which are cylindrical structures in the same flow field and 2) to study the extra lift force generation of the system. 2–D CFD models are used to simulate flow of stationary cylinder of BWTs at Re = 105. The two different turbulent models, Reynolds Averaged Navier-Stokes shear-stress transport k(RANS–SST k) and Detached Eddy Simulation shear-stress transport k(DES–SST k) are investigated. The results show that only DES–SST kgives converged results, therefore, DES–SST kis selected for the additional studies of two cylindrical structures. From 2–D CFD simulation, the one BWT in flow field case produces lift coefficient 0.851. In the case of two BTWs in same flow field (BWT no.2 is located at x = 3D, y = 0D, directly downstream of two cylinders), BTW no.1 and BWT no.2 show greater lift coefficients of 0.893 and 1.841, respectively. This result indicates that the kinetic energy generation of the downstream BWT in the two BWTs system in this study is greater than the baseline BWT with an increase of 116% of lift. Further work is needed to determine the optimum location of the behind wind turbine for greater lift and result to increasing of energy produce of the system.
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Dehghan Manshadi, Mahsa, Majid Ghassemi, Seyed Milad Mousavi, Amir H. Mosavi, and Levente Kovacs. "Predicting the Parameters of Vortex Bladeless Wind Turbine Using Deep Learning Method of Long Short-Term Memory." Energies 14, no. 16 (2021): 4867. http://dx.doi.org/10.3390/en14164867.
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From conventional turbines to cutting-edge bladeless turbines, energy harvesting from wind has been well explored by researchers for more than a century. The vortex bladeless wind turbine (VBT) is considered an advanced design that alternatively harvests energy from oscillation. This research investigates enhancing the output electrical power of VBT through simulation of the fluid–solid interactions (FSI), leading to a comprehensive dataset for predicting procedure and optimal design. Hence, the long short-term memory (LSTM) method, due to its time-series prediction accuracy, is proposed to model the power of VBT from the collected data. To find the relationship between the parameters and the variables used in this research, a correlation matrix is further presented. According to the value of 0.3 for the root mean square error (RMSE), a comparative analysis between the simulation results and their predictions indicates that the LSTM method is suitable for modeling. Furthermore, the LSTM method has significantly reduced the computation time so that the prediction time of desired values has been reduced from an average of two and a half hours to two minutes. In addition, one of the most important achievements of this study is to suggest a mathematical relation of output power, which helps to extend it in different sizes of VBT with a high range of parameter variations.
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AZAM, Md Taurhedul, Donghyuk KANG, Hiroyuki HIRAHARA, Kazuhisa MURATA, and Yasufumi SHIMOTSUKASA. "Enhancement of rotating jet by spirally structured vortex tube in centrifugal bladeless mixer flow." Journal of Fluid Science and Technology 14, no. 2 (2019): JFST0010. http://dx.doi.org/10.1299/jfst.2019jfst0010.
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Lim, Dong-hyeon, Jong-hyeok Lim, Roque Sando Vilanculo, Won-kyeong Kang, and Sunghoon Ahn. "A Bladeless Wind Generator with Deployable Boom." Academic Society for Appropriate Technology 10, no. 3 (2024): 178–87. https://doi.org/10.37675/jat.2024.00514.
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Energy is the key factor for improving the quality of life and it serves as the backbone of various sectors including health, sanitation, education and many other sectors related to human development. As the demand for energy increases in the cities, there is still scarcity of energy specially in remote villages, refugee camps and other disaster-stricken regions. The biggest problem with current Conventional Renewable energy sources such as wind and solar is limitation in terms of portability and high susceptibility to weather conditions. To address these issues, in this paper we introduce a Deployable Bladeless Wind Power Generator (DBWPG), this is a compact size portable wind generator whose boom can be deployed to different heights and thus respond to the various weather conditions. We developed a device that uses the vibrations induced on its boom due to the vortex shedding causes by wind flow, to produce electricity. The device is easy to care and easy to deploy to different heights when needed. With this innovation we aim to introduce a low cost, low maintenance, environmentally clean and easy to operate wind power source that can be benefit residents of rural areas, NGOs and other relief organizations.
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González-González, Enrique, David J. Yáñez, Susana Del Pozo, and Susana Lagüela. "Optimizing Bladeless Wind Turbines: Morphological Analysis and Lock-In Range Variations." Applied Sciences 14, no. 7 (2024): 2815. http://dx.doi.org/10.3390/app14072815.
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This study presents a comprehensive exploration centred on the morphology and surface structure of bladeless wind turbines (BWTs) aimed at optimizing their wind energy harvesting capability. Unlike conventional wind technology where vortex-induced vibration (VIV) is seen as problematic due to aeroelastic resonance, this effect becomes advantageous in BWT energy harvesters, devoid of frictional contact or gears. The primary objective of this study is to develop an optimal BWT design for maximizing energy output. Specifically, this study delves into optimizing the energy performance of these VIV wind energy harvesters, investigating how the geometry (shape and roughness) influences their operating range, known as Lock-In range. The results demonstrate how variations in geometry (convergent, straight, or divergent) can shift the Lock-In range to different Reynolds numbers (Re), modelled by the equation: Re (max Lock-In) = 0.30 α + 4.06. Furthermore, this study highlights the minimal impact of roughness within the considered test conditions.
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Cristian, Andrade-Terán. "Numerical simulation of fluid-structure interaction to predict the response of bladeless wind turbines to wind-induced vibrations in compact cities." Enfoque UTE 13, no. 2 (2022): 1–16. https://doi.org/10.29019/enfoqueute.796.
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This article presents an analysis of the Fluid-Structure response of bladeless wind turbines that work by induced aeroelastic resonance, which can be used in cities or small towns to form part of sustainable urban planning. In it, numerical simulations of the behavior of the wind and the effect called Von Karman Vortices that it produces when surrounding the structure of the wind turbine are carried out, taking as input data the wind speeds measured by the Mariscal Sucre Meteorological Station in Quito. CFD simulations determine the excitation signal caused by the different existing wind flows, the effects that these oscillations cause on the structure are simulated through a modal study and harmonic response to resonance. The results obtained show a proportional increase in the frequency and amplitude of the vortex shedding to the increase in wind speed, causing different excitation signals that cause the wind turbine to oscillate with amplitudes between 6 and 11 cm. Finally, the transient simulations show that the presence of houses and buildings in the vicinity where the wind turbine is installed causes the direction of the vortex street to vary, as well as alterations in the frequency and amplitude of the excitation.
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Ghabuzyan, Levon, Christopher Luengas, and Jim Kuo. "Urban Wind Harvesting Using Flow-Induced Vibrations." American Journal of Undergraduate Research 16, no. 4 (2020): 71–79. http://dx.doi.org/10.33697/ajur.2020.008.
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The growing global interest in sustainable energy has paved the way to the rapid development of large-scale wind farms, consisting of dozens to hundreds of wind turbines. Although these large wind farms can generate enormous amount of power, they are also costly and require large areas of land or water, and thus are not suitable for urban environments. Smaller urban wind turbines have been developed for urban environments, but there are significant challenges to their widespread deployment. One of these challenges are their urban wind flows as they are strongly affected by complex building structures, producing highly turbulent flows. Any urban wind turbine would need to be designed to function efficiently and safely under these flow conditions; however, these unpredictable and turbulent winds can induce undesirable vibrations and cause early failures. Recently, bladeless wind turbines are gaining interest due to their reduced costs compared with conventional wind turbines such as the vertical-axis wind turbine and horizontal-axis wind turbine. These bladeless turbines convert flow wind energy into vibration energy, then converts the vibration energy into electricity. This paper examines the effects of force-induced vibrations on a cantilever beam system through wind tunnel experimentation. When fluid flows around a bluff body, periodic shedding of vortices may occur under the right conditions. The vortex shedding process creates an asymmetric pressure distribution on the body which causes the body to oscillate, known as vortex-induced vibrations. The purpose of the paper is to understand the factors affecting flow-induced vibrations and to improve wind energy harvesting from these vibrations. The first part of the paper focuses on wind tunnel experiments, by utilizing a cantilever beam configuration, conceptualized by previous research. Then, the experimental model was tested in different configurations, to determine the best setup for maximizing vibrations induced on the model. The long-term goal of the project was utilizing the model to optimize the system to improve efficiency of wind energy harvesting. The experimental results showed that the presence of an upstream cylinder will significantly improve the amplitude of vibration for energy harvesting, furthermore, the experiments showed that spacing in different directions also affect the amplitude of the vibrations. A two tandem cylinder system was used in this work, including a fixed rigid upstream cylinder and a downstream cylinder supported by a cantilever beam. Various configurations of these two cylinders in terms of spanwise and streamwise separation distances were studied and their maximum and root mean square displacements are reported for different wind speeds. Results showed that the presence of an upstream cylinder will significantly improve the amplitude of vibrations. This work verified that a wind energy harvester needs to consider the effects of wind speed and separation configuration of the cylinders in order to maximize the harvester’s performance in urban environments. KEYWORDS: Sustainable Energy; Energy Harvesting; Urban Environments; Bladeless Wind Turbines; Flow-Induced Vibrations; Cantilever Beam System; Wind Tunnel; Wake
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Štefan, David, Ondřej Urban, and Pavel Rudolf. "Influence of swirl ratio on the onset of columnar vortices in the mixing part of swirl generator." IOP Conference Series: Earth and Environmental Science 1483, no. 1 (2025): 012032. https://doi.org/10.1088/1755-1315/1483/1/012032.
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Abstract The study presents analysis of conditions for the onset of columnar vortices in the mixing part of swirl generator. The simplified geometry, used for this analysis, is based on the physical model of the bladeless swirl generator developed by the research group from Brno University of Technology. This swirl generator was previously used for several studies of the spiral vortex structures generated in the diffuser part. The main aim for the current study is the mixing mechanism, which is realized in the part where the axial inflow meets the tangential one. Since there are no guide vanes or other driving geometry features, the mixing mechanism is realized randomly, is strongly time-dependent and its behavior is linked to the swirl ratio between the axial and tangential inflows. From previous studies, the appearance of vortical structures with columnar-like shape was identified. For the better understanding of this mixing mechanism, which may influence the flow downstream and consequently the generated vortex, the several swirl ratios of axial and tangential inflow were studied. The dynamic of vortices are extracted using A-f analysis and proper orthogonal decomposition. The results are based on the CFD simulation employing a hybrid RANS+LES turbulence models.
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Graciano, Dulce M., Fernando Z. Sierra-Espinosa, and Juan C. García. "Numerical simulation of vortex-induced vibration in a bladeless turbine: Effects of separation distance between tandem harvesters." Metascience in Aerospace 1, no. 3 (2024): 309–28. http://dx.doi.org/10.3934/mina.2024014.
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<p>Bladeless wind turbines are attracting attention as energy harvesters due to several conveniences like the ease of construction and suitability for operating under small wind speed. As a grouped energy generation system, it is likely the simplest configuration compared to wind farms. However, the characterization of tandem harvesters requires a deep understanding of the effects produced by the interaction of the two. Therefore, this work considered a set of two conical cylinders representing tandem harvesters, which lie on the bottom of a wind tunnel and were subjected to resonance conditions. The attention focused on evaluating the effects of separation distance between conical cylinders by three distances: $\ell$ = 0.25<italic>h</italic>, 0.5<italic>h,</italic> and 0.75<italic>h</italic>, where <italic>h</italic> is the cylinder's total height. Oscillation due to vortex shedding was numerically predicted. The analysis centered on the fluid-structure interaction in pairs of wind generators subjected to wind-induced resonance, and how the distance between them affects their oscillation. Experimental data of cylinder vibration measured in a wind tunnel served to validate the numerical results. The results showed strong effects of the wake on the second cylinder placed downstream from the first one for a distance $\ell$ = 0.25<italic>h</italic>. In contrast, minimum effects were observed for ℓ = 0.5<italic>h</italic> and ℓ = 0.75<italic>h</italic>.</p>
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PRADEEP, A., Raman KUMAR, P. S. SATHEESH KUMAR, et al. "Structural and dynamic analysis of tapered mast bladeless wind turbines using FEA and CFD for renewable energy generation." Journal of Metals, Materials and Minerals 35, no. 1 (2025): e2195. https://doi.org/10.55713/jmmm.v35i1.2195.
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The present analysis investigates the possibility of using a tapered mast profile for bladeless wind turbines (BWTs) to enhance the function of extracting wind energy through the phenomenon of vortex-induced vibrations. Conventional HAWTs which remain the most efficient are however, costly in maintenance, mechanically complicated and rather unfavourable to the environment. To overcome these challenges a prototype BWT with a 0.6 m tapered mast was developed for the currents using mild steel and hollow square steel sections. Wind tunnels were also used to compare stress distribution, structural deformation and vane vortex shedding for the building at different wind speeds. The maximum calculated equivalent stress on the mast was 1.63 ´ 105 Pa with the total deformation achieving 1.732 ´ 10‒6 m at a wind speed of 4 m∙s‒1. The tests have represented an independent check on mast dynamics using recorded wind at an average of 7 m∙s‒1 and have quantified the observed oscillations marking validity of the dynamic behavior observed through simulations. Piezoelectric sensors deployed to measure mechanical stress produced voltage responses of 7.68 mV, 28.865 mV and 44.915 mV at wind velocities of 5.5 m∙s‒1, 6.1 m∙s‒1 and 7.8 m∙s‒1 respectively. Findings show that wave amplitude of the oscillations increases with wind velocity and concomitantly voltage generated. The study highlights the potential of tapered mast geometries in improving structural efficiency and energy output.
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Онгар, Булбул, Ерлан Сарсенбаев та Айтумар Аманбаев. "АЭРОДИНАМИЧЕСКИЕ ХАРАКТЕРИСТИКИ БЕЗЛОПАСТНОГО ВЕТРЯКА VORTEX". Вестник КазАТК 128, № 5 (2023): 463–73. http://dx.doi.org/10.52167/1609-1817-2023-128-5-463-473.
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Производство электроэнергии от ветряных генераторов получило широкое распространение. Он занимает большую долю на мировом рынке производства электроэнергии в качестве ветряной турбины. Существует несколько типов ветряных турбин: ветряные турбины с горизонтальной осью, ветряные турбины с вертикальной осью и безлопастные ветряные турбины. Вихревой безлопастный ветродвигатель представляет собой резонансную ветряную турбину, вызванную вихревой вибрацией, которая считается наиболее экологически чистой ветряной турбиной. Что касается стартапа в Испании, Vortex Bladeless Ltd экспериментирует с тем, как добиться максимальной эффективности преобразования энергии безлопастной ветряной турбины, поскольку это еще не полностью завершено с нулевой коммерциализацией. Следовательно, Целью исследования является анализ нескольких форм и конфигураций вихревой безлопастной ветровой турбины с использованием вычислительной гидродинамики, а затем определение значения аэродинамических характеристик безлопастной ветровой турбины для определения оптимальной формы вихревой безлопастной ветряной турбины. Метод, использованный в этом исследовании, заключается в запуске 2D и 3D модели вихревой безлопастной ветряной турбины, разработанной в SolidWorks, в моделировании вычислительной гидродинамики с использованием программного обеспечения Ansys-Fluent. Две основные конструкции 3D-модели вихревой безлопастной ветряной турбины представлены пятью различными конфигурациями каждая. Данные моделирования интерпретируются несколькими способами, один из которых основан на средней скорости вершины и графике, извлеченном из процесса быстрого преобразования Фурье (БПФ). Получена наиболее оптимальная конфигурация вихревого безлопастного ветродвигателя – конструкция А4, имеющая наибольшее значение fv/fn, равное 0,62, а также аэродинамическую характеристику и параметры, влияющие на выбор конфигурации. Предложение для будущей работы состоит в том, чтобы детализировать массовую часть формы безлопастного ветряного двигателя и использовать усовершенствованный способ получения данных из БПФ.
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Hamdan, Hasan, Sharul Sham Dol, Abdelrahman Hosny Gomaa, et al. "Experimental and Numerical Study of Novel Vortex Bladeless Wind Turbine with an Economic Feasibility Analysis and Investigation of Environmental Benefits." Energies 17, no. 1 (2023): 214. http://dx.doi.org/10.3390/en17010214.
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This study combines experimental and numerical evaluations of Vortex Bladeless Wind Turbines (VBWTs) to understand their potential in renewable energy generation. The methodology employs Two-Way Fluid–Solid Interface (FSI) simulations, alongside real-world data, providing important insights into the turbine’s vibration dynamics and flow interactions during operation. Key findings include identifying optimal vibration frequencies and amplitudes that enhance energy harvesting and a clear advantage in power-generation estimations shown by one of the models used. The study reveals possible applications of VBWT in various settings like airport runways, highways, and buildings, indicating a promising avenue for incorporating such renewable-energy solutions. Discussions on the economic feasibility and environmental benefits of VBWT deployment are also presented, suggesting a need for further research and optimization in this area. A conceptual generator design and business model are introduced as part of a broader discussion on technology integration and energy storage. The research in this study encompasses experimental and numerical analysis, to achieve a broader understanding of the workings of a VBWT, realizing the feasibility of using such systems in lower-wind-speed conditions and upscaling to higher-wind-speed cases.
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Jia, Lu, Yongzhong Zeng, Xiaobing Liu, Wanting Huang, and Wenzhuo Xiao. "Testing and Numerical Analysis of Abnormal Pressure Pulsations in Francis Turbines." Energies 17, no. 1 (2024): 237. http://dx.doi.org/10.3390/en17010237.
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During the flood season, Francis turbines often operate under low-head and full-load conditions, frequently experiencing significant pressure pulsations, posing potential threats to the safe and stable operation of the units. However, the factors contributing to substantial pressure pulsations in Francis turbines are multifaceted. This paper focuses on a mixed-flow hydroelectric generating unit at a specific hydropower station. Field tests were conducted to investigate abnormal vibrations and hydraulic pressure pulsations under low-head and full-load conditions. Utilizing the Navier–Stokes equations and the RNG k-ε turbulence model, the unsteady flow field within the turbine under these conditions was calculated. The results indicate that the abnormal pressure pulsations detected in the bladeless zone between the wicket gates and the turbine inlet are due to operational points deviating from the normal operating range of the turbine. When water flows at a large inflow angle, striking the turbine blade heads, it leads to significant flow separation and vortex formation at the back of the blade inlet edges, causing severe vibrations in the hydroelectric generating unit. These findings provide a basis and assurance for the safe and stable operation of the power station.
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Younis, Adel, Zuomin Dong, Mohamed ElBadawy, Abeer AlAnazi, Hayder Salem, and Abdullah AlAwadhi. "Design and Development of Bladeless Vibration-Based Piezoelectric Energy–Harvesting Wind Turbine." Applied Sciences 12, no. 15 (2022): 7769. http://dx.doi.org/10.3390/app12157769.
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To meet the growing energy demand and increasing environmental concerns, clean and renewable fluid energy, such as wind and ocean energy, has received considerable attention. This study proposes a bladeless wind energy–harvesting device based vortex-induced vibrations (VIV). The proposed design is mainly composed of a base, a hollow mast, and an elastic rod. The proposed design takes advantage of vortices generated when the airflow interacts with the mast, and the flow splits and then separates and generates vortices that eventually make the elastic rod oscillate, and out of these oscillations, energy can be harvested. Different airflow disruption geometries are studied and tested numerically and experimentally to identify the most effective shape and orientation for converting wind energy to electric energy. Computational fluid dynamics (CFD) modeling and simulations were performed on the elastic mast, a VIV device’s core wind energy–collecting component, to guide the device’s design. These simulations examined the mast-produced lift coefficient, velocity, pressure, and vorticity contours of different mast geometries. The mast’s vibration energy under different wind intensities was also experimentally tested using a scaled model in the wind tunnel. The level of converted electric power was measured and monitored using piezoelectric sensors mounted at different locations on the mast. The experimental study identified the ideal orientation angle of the mast and the best location for the piezoelectric sensors for harnessing more energy. The experiments confirmed the CFD simulation results that a complex cylinder design produces more power. The combined numerical and experimental studies led to an environmentally friendly, new VIV design with much improved power generation capabilities.
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Štefan, David, Jan Klement, Ondřej Urban, and Pavel Rudolf. "Assessment of the distributor layout influence on the vortical flow within the hydraulic turbine." IOP Conference Series: Earth and Environmental Science 1411, no. 1 (2024): 012069. https://doi.org/10.1088/1755-1315/1411/1/012069.
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Abstract The study presents analysis of conditions for the onset of vortices in the simplified geometry of the turbine domain. The simplified geometry, used for this analysis, is based on the physical model of the bladeless swirl generator developed by the research group from Brno University of Technology. This swirl generator was previously used for several studies of the spiral vortex structures generated in the diffuser part. In original geometry there are no guide vanes or other driving geometry features, thus the mixing mechanism is realized randomly, is strongly time-dependent and its behavior is linked to the swirl ratio between the axial and tangential inflows. From previous studies, the appearance of vortical structures with columnar-like shape was identified. Thus, the main aim for the current study is to assess the influence of distributor blade cascade on the onset and behavior of such vortical structures which resembles the ones observed in hydraulic turbines at low load conditions. For selected swirl ratio the distributor blades are designed specifically to influence flow with minimal effect. The distributor layouts with different number of blades are tested. The dynamics of vortices, their spatial shape and extend are examined through several post-processing tools. The results are mainly based on the CFD simulation employing a hybrid RANS+LES turbulence model.
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DAVANG, SHUBHAM S., and SUNIL K. MANADE. "BLADELESS WIND TURBINE." IJIERT - International Journal of Innovations in Engineering Research and Technology 5, no. 4 (2018): 36–39. https://doi.org/10.5281/zenodo.1453973.
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<strong><strong> </strong>It uses a radically new approach to capturing wind energy. The device captures the energy of vortices,an aerodynamic effect that has plagued structural engineers and architects for ages (vortex shedding effect). As the wind bypasses a fixed structure,its flow changes and generates a cyclical pattern of vortices. Once these forces are strong enough,the fixed structure starts oscillating,may enter into resonance with the lateral forces of the wind,and even collapse. There is a classic academic example of the Tacoma Narrows Bridge,which collapsed three months after its inauguration because of the Vortex shedding effect as well as effects of flattering and galloping.</strong> <strong>https://www.ijiert.org/paper-details?paper_id=141167</strong>
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Yang, Chunxia, Jiawei Wu, Dinge Xu, Yuan Zheng, Xueyuan Hu, and Zhe Long. "Analysis of Flow Field Characteristics and Pressure Pulsation in Horizontal Axis Double-Runner Francis Turbine." Water 13, no. 19 (2021): 2671. http://dx.doi.org/10.3390/w13192671.
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Horizontal axis double-runner Francis turbines have great advantages in the development of small hydropower plants, but the arrangement of double runners aggravates the complexity of the water flow between runners, and the mutual influence of the two runners cannot be ignored. In order to explore the relationship between the performance and the internal flow field and investigate the pressure pulsation characteristics of the double-runner Francis turbine, the steady and unsteady numerical analysis of the full flow channel of a prototype turbine was carried out based on the Realizable k-epsilon model and the polyhedral mesh method. The results show that the relationship between the average efficiency of the two runners and the flow difference between the runners is negatively correlated. As the flow rate difference between the runners on both sides increases, the average efficiency of the runners decreases. The draft tube flow of a horizontal-axis turbine has a profound effect on the flow field characteristics in the runner. When the working conditions change, the turning and converging timing of the mainstream at the outlet of the two runners will change. The movement of the mainstream promotes the change in location of the dead water zone. The existence of the vortex zone makes the pressure distribution at the outlet of the runner uneven, which is an important reason for the asymmetry of the flow in the runner. The analysis of pressure pulsation and its frequency spectrum shows that when the working conditions change, the low-frequency, strong pressure pulsation area on the surface of the guide vane will regularly migrate between the two runners, while the high-frequency pressure pulsation that occurs in the bladeless zone will dissipate in the runner. The doubling of the blade frequency on the pressure surface and back surface of the blades gradually attenuates with the increase of frequency. The pressure pulsation attenuation on the surface of the high-position blade conforms to the linear law, and the attenuation of the pressure pulsation on the surface of the low-position blade conforms to the exponential law. The research in this paper provides a certain reference value for revealing the flow field mechanism and pressure pulsation characteristics of the double-runner Francis turbine.
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Shraddha S Magar, Archana S Sugandhi, Shweta H Pawar, Suhas B Khadake, and H. M. Mallad. "Harnessing Wind Vibration, a Novel Approach towards Electric Energy Generation - Review." International Journal of Advanced Research in Science, Communication and Technology, October 10, 2024, 73–82. http://dx.doi.org/10.48175/ijarsct-19811.
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Vortex-Bladeless is a Spanish SME whose objective is to develop a new concept of wind turbine without blades called Vortex or vorticity wind turbine. This design represents a new paradigm in wind energy and aims to eliminate or reduce many of the existing problems in conventional generators. The bladeless vortex turbine is one such concept that uses the principle of aero-elasticity and thereby the variations produced by it to generate electricity. Project work will include the design and development of a vortex wind bladeless turbine and a gyro action based e-generator to be coupled to it to generate the electricity. Prototype development will be done using 3-D printing for the vortex turbine and the e-generator to make a scaled working model that will demonstrate electricity generation and testing will be done on the same to determine the effect of wind speed on , turbine speed , voltage , current and power generated by the model
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Samsudin, Mohd Izzat Syahmi, and Sofian Mohd. "Development of A Small-Scale Vortex-Induced Wind Turbine." Progress in Aerospace and Aviation Technology 2, no. 1 (2022). http://dx.doi.org/10.30880/paat.2022.02.01.002.
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Over the last several years, there has been a significant and encouraging interest in the generation of power from wind. However, a massive wind turbine can only operate in a high wind speed condition. The vortex bladeless wind turbine is a completely new idea in wind turbines with a different mode of operation. It is designed to operate in low wind conditions, making it an ideal choice for areas with such conditions, such as Malaysia. This study aims to develop and evaluate a functional prototype of a vortex bladeless wind turbine that can be used to harvest wind energy in a low wind speed condition. A vortexbladeless wind turbine is fabricated based on existing research on the principle of the vortex shedding phenomenon. It is built in a cylindrical shape with an approximately 2 m height measuring from the base to the top of the mast and 0.2 m in diameter. The structure of a bladeless wind turbine is a flexible cylindrical mast over the setup that captures potential forms of energy from moving airstreams and uses a vortex induced vibration (VIV) mechanism to produce vibration in the structure. The testing wasdone by using a wind tunnel’s exhaust that produced 1 m/s to 10 m/s of air flow, which simulates a low-to-medium wind speed condition. The vibration is turned into electrical energy, using a power generating system like an electromagnetic induction mechanism. The analysis of the results is based on numerous data points gathered during the testing, including the frequency of oscillation, vortex shedding, natural frequency, and resonance parameter. Through the investigation, the results show that the phenomena of induced vibration were working at even critically low speeds, which starts at 3.3 m/s, where standard and conventional wind turbines may fail to produce the desired outcomes as they are outside of their operating windspeed. The frequency of vortex shedding increases with windspeed, from 0.94 Hz at 1 m/s to 9.39 Hz at 10 m/s. On this basis, it is confirmed that the prototype of the vortex bladeless wind turbine is working properly in harvesting wind energy, though several improvements need to be made.
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Raghuwanshi, Satish. "Design and Fabrication of Vortex Bladeless Turbine." SSRN Electronic Journal, 2020. http://dx.doi.org/10.2139/ssrn.3608544.
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He, Deng-Hui, Ge Wang, Zheng Liu, and Rui Huang. "Bubble breakage and aggregation characteristics in a vortex pump under bubble inflow." Physics of Fluids 35, no. 9 (2023). http://dx.doi.org/10.1063/5.0168639.
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The behaviors of bubbles in a vortex pump play a crucial role in its performance when handling gas–liquid flows. However, not much research has been done on the distribution of the gas–liquid phases and the characteristics of bubble breakage and aggregation in vortex pumps. This lack of understanding hinders the improvement of pump performance in gas–liquid flow transport. This study aims to investigate the bubble characteristics in a vortex pump using the population balance model, focusing on the variation of bubble size and the influence of the inlet gas volume fraction (IGVF) on bubble breakage and aggregation. The results show that as the IGVF increases, the gas volume fraction in the impeller becomes larger than that in the bladeless chamber. The majority of bubbles in the impeller are concentrated near the hub, while they also remain in the circulating-flow zone of the bladeless chamber. Under low IGVF conditions, the average diameter of bubbles decreases from the pump inlet to the outlet. The bladeless chamber has a larger average bubble diameter and a higher percentage of large bubbles compared to other parts of the pump. Moreover, the bubble number density at the pump outlet increases with the IGVF, indicating the production of more bubbles, while the increase in IGVF also results in an increase in the percentage of large bubbles. The study also discusses the mechanism of bubble breakage and aggregation in vortex pumps. It suggests that the effective breakage frequency and effective aggregation frequency are responsible for bubble breakage and aggregation in the vortex pump. The gas volume fraction and turbulent dissipation rate are identified as important parameters affecting the effective breakage and aggregation frequency. These findings provide new insights into understanding the characteristics of bubble breakage and aggregation in vortex pumps.
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Francis, Sigil, V. Umesh, and S. Shivakumar. "Design and Analysis of Vortex Bladeless Wind Turbine." Materials Today: Proceedings, April 2021. http://dx.doi.org/10.1016/j.matpr.2021.03.469.
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"Approach of Current Generation from Vortex Bladeless Windmill." Journal of Xidian University 14, no. 5 (2020). http://dx.doi.org/10.37896/jxu14.5/487.
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Wulandana, Rachmadian, David Foote, Bong Jae Chung, and Ashwin Vaidya. "Vortex-induced autorotation potentials of bladeless turbine models." International Journal of Green Energy, July 10, 2021, 1–11. http://dx.doi.org/10.1080/15435075.2021.1941044.
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Raghuwanshi, Satish, Chandrashekhar singh Mourya, AYUSH PANDEY, akriti shrivastava, amol sonanis, and mayank banwariya. "Design and Fabrication of Vortex Bladeless Wind Turbine." SSRN Electronic Journal, 2020. http://dx.doi.org/10.2139/ssrn.3609291.
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Maftouni, Negin, Mahsa Dehghan Manshadi, and Seyed Milad Mousavi. "The effect of drag force on the body frequencies and the power spectrum of a bladeless wind turbine." Transactions of the Canadian Society for Mechanical Engineering, April 13, 2021, 1–8. http://dx.doi.org/10.1139/tcsme-2020-0194.
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New types of bladeless wind turbines and electricity generation are currently one of the most interesting topics in engineering. Electricity generation using structural vibration due to the resonance phenomenon is the concept behind a vortex bladeless turbine. The present study numerically investigated the effects of the drag force on the body frequency of an oscillating bladeless wind turbine. A two-dimensional numerical simulation was performed for a cylinder with a semi-circular cross-flow cross-section in two different cases. This research was conducted for both uncontrolled and controlled oscillating cylinders. The controlling process was performed using a pair of ring magnets as springs with a variable coefficient. The flow field, vibration, vortex shedding, structural frequencies, and resonance phenomena were studied in this research. Finally, the controlled and uncontrolled frequencies of the cylinder are explored, and the power spectra for various velocities are analyzed in two different states, namely, with and without a tuning system. From the results, it can be concluded that the usage of the controlling system in these turbines can significantly regulate the oscillations and increase the frequency value by limiting the vibration amplitude. According to this principle, it can be inferred that increasing the frequency of fluctuations greatly increases the production capacity of these turbines.
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Elsayed, Ahmed M., and Mohamed B. Farghaly. "Theoretical and numerical analysis of vortex bladeless wind turbines." Wind Engineering, February 18, 2022, 0309524X2210804. http://dx.doi.org/10.1177/0309524x221080468.
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Wind energy is one of the most abundant renewable energy resources that have been used to generate electricity. A new used method called Vortex Bladeless Wind Turbines which is basically a rod oscillating and vibrating in response to the vortices originating from the wind passing by the rod. This paper presents a mathematical model used in analysis the work of the VBWT. A prototype design was be created using solidwork to calculate the physical properties. In addition, a numerical study was carried out using Ansys software to calculate the forces affecting the VBWT. Finally, the safety of VBWT structure is studied. The results indicated that, the obtained model can be applied practically in studying the performance of general VBWT with low wind speed, as VBWT use less space, low maintenance and hence economical. The mathematical formula of VBWT power is function of air velocity, aerodynamic coefficients, and prototype physical properties.
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Adeyanju, A. Anthony, and D. Boucher. "Theoretical Analysis of the Bladeless Wind Turbine Performance." Journal of Scientific Research and Reports, December 31, 2020, 93–106. http://dx.doi.org/10.9734/jsrr/2020/v26i1030325.
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A bladeless wind turbine utilizes vortex formation to extract energy from the wind. Vortex formation are small swirls of air which occur as a result of the geometric shape of the device. This study designed a bladeless wind turbine which incorporates a structural support at a distance offset from the center axis of the cylindrical mast. Springs were added to the final design as means to provide the stiffness required to obtain resonance with the vortex shedding frequency and to also assist in supporting the structure. The analysis was conducted at wind speeds 1m/s, 4m/s and 7m/s, where the geometrical properties of the device remained constant. MATLAB was used to analyze the equation of motion derived for the device. The variables of interest in the studies were mainly the angular acceleration, power coefficient and the resonant frequency. The results obtained showed that for wind speeds above and below the designed wind speed of 4m/s the angular velocity remained the same. Results of this model showed that high amplitudes occur only at resonance. Results showed that with the current power generating mechanism, the average efficiency attainable is approximately 2% at steady state. This is the theoretical efficiency which could be achieved based on the current model. It was discovered that for linearly tapered cylinders, increased oscillations occurred during the ‘lock-in range’ for a range of reduced velocities. The reduced velocity of the designed wind speed is approximately Vr = 5m/s. This value lies within the theoretical range lock in range where increased oscillations are expected to occur between reduced velocities of 4.75m/s and 8m/s [1].
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Duwairi, Hamzeh, Thamer Al-Halaybeh, and Mohammad Alrbai. "The effect of dusty wind hydrodynamics on bladeless wind turbines." Wind Engineering, March 25, 2025. https://doi.org/10.1177/0309524x251329727.
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The use of bladeless wind turbines (BWTs) for power generation has grown, but their performance under various environmental conditions, particularly dust accumulation, requires further study. This research develops a theoretical mathematical model based on continuity, momentum, and vortex equations to analyze the vibration behavior of the BWT mast, focusing on vortex-induced vibrations. Numerical simulations explore the relationships between dusty wind velocity, vortex shedding frequency, elasticity constant, converted power, and efficiency. The effects of mast height and diameter on oscillation frequency and power conversion efficiency are also examined. Results show that oscillation frequency remains constant along the mast, while power efficiency is inversely proportional to diameter and directly proportional to mast height. The highest power efficiency (16.99%) occurs at 2.75 m, decreasing over time. At 12 m, efficiency peaks at 26.61%. Additionally, increasing dust levels improve efficiency, offering insights for optimizing BWT design in dusty conditions.
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Mahmoud, Gamal M. "Design and fabrication of linear generator for vortex bladeless wind turbine." Pharos Engineering Science Journal, September 15, 2024, 12–15. http://dx.doi.org/10.21608/pesj.2024.320716.1001.
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Prasad, Avagaddi, Proddutur Nagateja, and Vivekanandan Subburaj. "Solar coupled Vortex Bladeless Wind Turbine System With BESS in Rural Electrification." International Journal of Ambient Energy, May 19, 2022, 1–19. http://dx.doi.org/10.1080/01430750.2022.2078881.
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