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Journal articles on the topic 'Turbines Aerodynamics'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Shen, Xin, Ping Hu, Jinge Chen, Xiaocheng Zhu, and Zhaohui Du. "The unsteady aerodynamics of floating wind turbine under platform pitch motion." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 232, no. 8 (2018): 1019–36. http://dx.doi.org/10.1177/0957650918766606.

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The aerodynamic performance of floating platform wind turbines is much more complex than fixed-base wind turbines because of the flexibility of the floating platform. Due to the extra six degrees-of-freedom of the floating platform, the inflow of the wind turbine rotors is highly influenced by the motions of the floating platform. It is therefore of interest to study the unsteady aerodynamics of the wind turbine rotors involved with the interaction of the floating platform induced motions. In the present work, a lifting surface method with a free wake model is developed for analysis of the uns

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2

Barkat, Ibtissem, Abdelouahab Benretem, Fawaz Massouh, Issam Meghlaoui, and Ahlem Chebel. "Modeling and simulation of forces applied to the horizontal axis wind turbine rotors by the vortex method coupled with the method of the blade element." International Journal of Power Electronics and Drive Systems (IJPEDS) 12, no. 1 (2021): 413. http://dx.doi.org/10.11591/ijpeds.v12.i1.pp413-420.

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This article aims to study the forces applied to the rotors of horizontal axis wind turbines. The aerodynamics of a turbine are controlled by the flow around the rotor, or estimate of air charges on the rotor blades under various operating conditions and their relation to the structural dynamics of the rotor are critical for design. One of the major challenges in wind turbine aerodynamics is to predict the forces on the blade as various methods, including blade element moment theory (BEM), the approach that is naturally adapted to the simulation of the aerodynamics of wind turbines and the dyn

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3

Macháček, Michael, Stanislav Pospíšil, and Hrvoje Kozmar. "Scaling of wind turbine aerodynamics: wind tunnel experiments." MATEC Web of Conferences 313 (2020): 00053. http://dx.doi.org/10.1051/matecconf/202031300053.

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A small-scale wind turbine model was designed and manufactured to study its aerodynamic thrust force and the harvested flow energy. To provide a good understanding of the aerodynamics of the small-scale wind turbine at the low Reynolds number, the performance of three different types of blade airfoils was studied. The main motivation for the design of a new miniature wind turbine model was to achieve realistic values of the thrust force and the power coefficient on the model scale. A new blade profile with a thickness of 10% was designed and employed to reach the high tip-speed ratio, which is

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4

Qi, Liangwen, Liming Zheng, Xingzhi Bai, Qin Chen, Jiyao Chen, and Yan Chen. "Nonlinear Maximum Power Point Tracking Control Method for Wind Turbines Considering Dynamics." Applied Sciences 10, no. 3 (2020): 811. http://dx.doi.org/10.3390/app10030811.

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A combined strategy of torque error feed-forward control and blade-pitch angle servo control is proposed to improve the dynamic power capture for wind turbine maximum power point tracking (MPPT). Aerodynamic torque is estimated using the unscented Kalman filter (UKF). Wind speed and tip speed ratio (TSR) are estimated using the Newton–Raphson method. The error between the estimated aerodynamic torque and the steady optimal torque is used as the feed-forward signal to control the generator torque. The gain parameters in the feed-forward path are nonlinearly regulated by the estimated generator

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5

Yang, Xiaolei, Daniel Foti, Christopher Kelley, David Maniaci, and Fotis Sotiropoulos. "Wake Statistics of Different-Scale Wind Turbines under Turbulent Boundary Layer Inflow." Energies 13, no. 11 (2020): 3004. http://dx.doi.org/10.3390/en13113004.

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Subscale wind turbines can be installed in the field for the development of wind technologies, for which the blade aerodynamics can be designed in a way similar to that of a full-scale wind turbine. However, it is not clear whether the wake of a subscale turbine, which is located closer to the ground and faces different incoming turbulence, is also similar to that of a full-scale wind turbine. In this work we investigate the wakes from a full-scale wind turbine of rotor diameter 80 m and a subscale wind turbine of rotor diameter of 27 m using large-eddy simulation with the turbine blades and n

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6

He, Yi Ming, and Xian Yi Qian. "Design of Wind Power Turbine's Main Components and Computation of its Output Power." Applied Mechanics and Materials 195-196 (August 2012): 23–28. http://dx.doi.org/10.4028/www.scientific.net/amm.195-196.23.

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We have mainly studied the main structure of wind power turbines components in accordance with the principle aerodynamics. We also have taken horizontal axis wind power turbine for example and studied the basic structure and producing technology about wheel, base and other equipments. We have computed the wind power turbines output power and efficiency, and compared with some kinds of different wind power turbines output power and efficiency. All what have studied is important to design wind power turbine.

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7

Littik, Y. Fredrika, Y. Heru Irawan, and M. Agung Bramantya. "Flow-driven simulation on variation diameter of counter rotating wind turbines rotor." MATEC Web of Conferences 154 (2018): 01111. http://dx.doi.org/10.1051/matecconf/201815401111.

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Wind turbines model in this paper developed from horizontal axis wind turbine propeller with single rotor (HAWT). This research aims to investigating the influence of front rotor diameter variation (D1) with rear rotor (D2) to the angular velocity optimal (ω) and tip speed ratio (TSR) on counter rotating wind turbines (CRWT). The method used transient 3D simulation with computational fluid dynamics (CFD) to perform the aerodynamics characteristic of rotor wind turbines. The counter rotating wind turbines (CRWT) is designed with front rotor diameter of 0.23 m and rear rotor diameter of 0.40 m.

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8

MERAD, Asmae BOUANANI, and Mama BOUCHAOUR. "MODELING AND SIMULATION OF THE VERTICAL AXIS WIND TURBINE BY QBLADE SOFTWARE." Algerian Journal of Renewable Energy and Sustainable Development 2, no. 02 (2020): 181–88. http://dx.doi.org/10.46657/ajresd.2020.2.2.11.

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The use of wind energy has no harmful effects on the environment. This makes it a clean energy that is a real alternative to the problem of nuclear waste management and greenhouse gas emissions. Vertical axis wind turbines have prospective advantages in the field of domestic applications, because they have proven effectual in urban areas where wind flow conditions are intermittent, omnidirectional, unsteady and turbulent. The wind cannot ensure a regular energy supply without optimising the aerodynamics of the blades. This article presents a reminder about wind energy and wind turbines, especi

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9

Dunn, Michael G. "Convective Heat Transfer and Aerodynamics in Axial Flow Turbines." Journal of Turbomachinery 123, no. 4 (2001): 637–86. http://dx.doi.org/10.1115/1.1397776.

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The primary focus of this paper is convective heat transfer in axial flow turbines. Research activity involving heat transfer generally separates into two related areas: predictions and measurements. The problems associated with predicting heat transfer are coupled with turbine aerodynamics because proper prediction of vane and blade surface-pressure distribution is essential for predicting the corresponding heat transfer distribution. The experimental community has advanced to the point where time-averaged and time-resolved three-dimensional heat transfer data for the vanes and blades are obt

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10

Schreck, Scott J., Michael C. Robinson, M. Maureen Hand, and David A. Simms. "Blade Dynamic Stall Vortex Kinematics for a Horizontal Axis Wind Turbine in Yawed Conditions*." Journal of Solar Energy Engineering 123, no. 4 (2001): 272–81. http://dx.doi.org/10.1115/1.1408307.

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Horizontal axis wind turbines routinely suffer significant time varying aerodynamic loads that adversely impact structures, mechanical components, and power production. As lighter and more flexible wind turbines are designed to reduce overall cost of energy, greater accuracy and reliability will become even more crucial in future aerodynamics models. However, to render calculations tractable, current modeling approaches admit various approximations that can degrade model predictive accuracy. To help understand the impact of these modeling approximations and improve future models, the current e

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11

Hoeijmakers, H. W. M., A. van Garrel, and C. H. Venner. "Analysis aerodynamics diffuser-augmented wind turbines." Journal of Physics: Conference Series 1618 (September 2020): 042008. http://dx.doi.org/10.1088/1742-6596/1618/4/042008.

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12

Hansen, A. C., and C. P. Butterfield. "Aerodynamics of Horizontal-Axis Wind Turbines." Annual Review of Fluid Mechanics 25, no. 1 (1993): 115–49. http://dx.doi.org/10.1146/annurev.fl.25.010193.000555.

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13

Snel, Herman. "Review of Aerodynamics for Wind Turbines." Wind Energy 6, no. 3 (2003): 203–11. http://dx.doi.org/10.1002/we.97.

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14

Fontanella, Alessandro, Ilmas Bayati, Robert Mikkelsen, Marco Belloli, and Alberto Zasso. "UNAFLOW: a holistic wind tunnel experiment about the aerodynamic response of floating wind turbines under imposed surge motion." Wind Energy Science 6, no. 5 (2021): 1169–90. http://dx.doi.org/10.5194/wes-6-1169-2021.

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Abstract. Floating offshore wind turbines are subjected to large motions due to the additional degrees of freedom of the floating foundation. The turbine rotor often operates in highly dynamic inflow conditions, and this has a significant effect on the overall aerodynamic response and turbine wake. Experiments are needed to get a deeper understanding of unsteady aerodynamics and hence leverage this knowledge to develop better models and to produce data for the validation and calibration of existing numerical tools. In this context, this paper presents a wind tunnel experiment about the unstead

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15

Du, Longhuan, Grant Ingram, and Robert G. Dominy. "A review of H-Darrieus wind turbine aerodynamic research." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 23-24 (2019): 7590–616. http://dx.doi.org/10.1177/0954406219885962.

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The H-Darrieus vertical axis turbine is one of the most promising wind energy converters for locations where there are rapid variations of wind direction, such as in the built environment. The most challenging considerations when employing one of these usually small machines are to ensure that they self-start and to maintain and improve their efficiency. However, due to the turbine's rotation about a vertical axis, the aerodynamics of the turbine are more complex than a comparable horizontal axis wind turbine and our knowledge and understanding of these turbines falls remains far from complete

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16

Abo-Khalil, Ahmed G., Saeed Alyami, Khairy Sayed, and Ayman Alhejji. "Dynamic Modeling of Wind Turbines Based on Estimated Wind Speed under Turbulent Conditions." Energies 12, no. 10 (2019): 1907. http://dx.doi.org/10.3390/en12101907.

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Large-scale wind turbines with a large blade radius rotates under fluctuating conditions depending on the blade position. The wind speed is maximum in the highest point when the blade in the upward position and minimum in the lowest point when the blade in the downward position. The spatial distribution of wind speed, which is known as the wind shear, leads to periodic fluctuations in the turbine rotor, which causes fluctuations in the generator output voltage and power. In addition, the turbine torque is affected by other factors such as tower shadow and turbine inertia. The space between the

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17

Zhang, Ling, Hui Xia Sheng, and Da Fei Guo. "Effect of Wind Shear to Horizontal Axis Wind Turbine Aerodynamic." Applied Mechanics and Materials 521 (February 2014): 99–103. http://dx.doi.org/10.4028/www.scientific.net/amm.521.99.

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A three-dimensional unsteady numerical study of the streaming flow field of the1.2 MW horizontal axis wind turbines which operation in the 11.26 m/s under the uniform wind and the shear wind have been carried out in this paper. according to the simulation results to understand the effect of uniform flow and the dynamic wind shear flow to the output power of wind turbine and the aerodynamics. results showed that: Under the uniform wind,Wind turbine power calculation values are in good agreement with the design value ,Wind turbines under the influence of wind shear can lead to change in load and

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18

Tiseira Izaguirre, Andrés Omar, Roberto Navarro García, Lukas Benjamin Inhestern, and Natalia Hervás Gómez. "Design and Numerical Analysis of Flow Characteristics in a Scaled Volute and Vaned Nozzle of Radial Turbocharger Turbines." Energies 13, no. 11 (2020): 2930. http://dx.doi.org/10.3390/en13112930.

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Over the past few decades, the aerodynamic improvements of turbocharger turbines contributed significantly to the overall efficiency augmentation and the advancements in downsizing of internal combustion engines. Due to the compact size of automotive turbochargers, the experimental measurement of the complex internal aerodynamics has been insufficiently studied. Hence, turbine designs mostly rely on the results of numerical simulations and the validation of zero-dimensional parameters as efficiency and reduced mass flow. To push the aerodynamic development even further, a precise validation of

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19

Manwaring, S. R., and D. C. Wisler. "Unsteady Aerodynamics and Gust Response in Compressors and Turbines." Journal of Turbomachinery 115, no. 4 (1993): 724–40. http://dx.doi.org/10.1115/1.2929308.

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A comprehensive series of experiments and analyses was performed on compressor and turbine blading to evaluate the ability of current, practical, engineering/analysis models to predict unsteady aerodynamic loading of modern gas turbine blading. This is part of an ongoing effort to improve methods for preventing blading failure. The experiments were conducted in low-speed research facilities capable of simulating the relevant aerodynamic features of turbomachinery. Unsteady loading on compressor and turbine blading was generated by upstream wakes and, additionally for compressors, by a rotating

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20

Ilieva Ilieva, Galina. "A Deep Insight to Secondary Flows." Defect and Diffusion Forum 379 (November 2017): 83–107. http://dx.doi.org/10.4028/www.scientific.net/ddf.379.83.

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Flow through turbine stages is three-dimensional and highly complex due to secondary flows, axial and tip clearances, 3D blades, rotational effects, varying fluid properties, turbulence effects, boundary layer development, etc. Secondary flows presence in turbines is identified as one of the main reason for losses and less efficiency performance. Hence in turbines, the need for understanding of secondary flows mechanisms and application of methods for their reduction is significant. This study is targeted to the discussion of secondary flows, аs follows: analysis of reasons for their developme

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21

Tchakoua, Pierre, René Wamkeue, Mohand Ouhrouche, Ernesto Benini, and Gabriel Ekemb. "Electric Circuit Model for the Aerodynamic Performance Analysis of a Three-Blade Darrieus-Type Vertical Axis Wind Turbine: The Tchakoua Model." Energies 9, no. 10 (2016): 820. http://dx.doi.org/10.3390/en9100820.

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The complex and unsteady aerodynamics of vertical axis wind turbines (VAWTs) pose significant challenges for simulation tools. Recently, significant research efforts have focused on the development of new methods for analysing and optimising the aerodynamic performance of VAWTs. This paper presents an electric circuit model for Darrieus-type vertical axis wind turbine (DT-VAWT) rotors. The novel Tchakoua model is based on the mechanical description given by the Paraschivoiu double-multiple streamtube model using a mechanical‑electrical analogy. Model simulations were conducted using MATLAB for

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22

Díaz, Otoniel, and Luis E. Suárez. "Seismic Analysis of Wind Turbines." Earthquake Spectra 30, no. 2 (2014): 743–65. http://dx.doi.org/10.1193/123011eqs316m.

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An analytical model of an operating wind turbine to obtain the seismic response due to three base accelerations is presented. The model considers the flexibility of the blades in the flapping direction and the flexibility of the tower in bending and twisting. Blade aerodynamics and gyroscopic moments are included. A Vestas-V82 turbine is selected to demonstrate the methodology. The results show that only the first two tower modes in each direction (fore-aft and lateral) are mostly excited. It is found that the lateral motion of the wind turbine is more susceptible to experiencing large displac

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23

KOROBENKO, A., M. C. HSU, I. AKKERMAN, J. TIPPMANN, and Y. BAZILEVS. "STRUCTURAL MECHANICS MODELING AND FSI SIMULATION OF WIND TURBINES." Mathematical Models and Methods in Applied Sciences 23, no. 02 (2013): 249–72. http://dx.doi.org/10.1142/s0218202513400034.

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A fluid–structure interaction (FSI) validation study of the Micon 65/13M wind turbine with Sandia CX-100 composite blades is presented. A rotation-free isogeometric shell formulation is used to model the blade structure, while the aerodynamics formulation makes use of the FEM-based ALE-VMS method. The structural mechanics formulation is validated by means of eigenfrequency analysis of the CX-100 blade. For the coupling between the fluid and structural mechanics domains, a nonmatching discretization approach is adopted. The simulations are done at realistic wind conditions and rotor speeds. The

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24

Manolas, Dimitris I., Vasilis A. Riziotis, George P. Papadakis, and Spyros G. Voutsinas. "Hydro-Servo-Aero-Elastic Analysis of Floating Offshore Wind Turbines." Fluids 5, no. 4 (2020): 200. http://dx.doi.org/10.3390/fluids5040200.

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A fully coupled hydro-servo-aero-elastic simulator for the analysis of floating offshore wind turbines (FOWTs) is presented. All physical aspects are addressed, and the corresponding equations are concurrently solved within the same computational framework, taking into account the wind and wave excitations, the aerodynamic response of the rotor, the hydrodynamic response of the floater, the structural dynamics of the turbine-floater-mooring lines assembly and finally the control system of the wind turbine. The components of the complex multi-physics system of a FOWT interact with each other in

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Cao, Jiufa, Weijun Zhu, Xinbo Wu, Tongguang Wang, and Haoran Xu. "An Aero-acoustic Noise Distribution Prediction Methodology for Offshore Wind Farms." Energies 12, no. 1 (2018): 18. http://dx.doi.org/10.3390/en12010018.

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Recently attention has been paid to wind farm noise due to its negative health impact, not only on human beings, but also to marine and terrestrial organisms. The current work proposes a numerical methodology to generate a numerical noise map for a given wind farm. Noise generation from single wind turbines as well as wind farms has its basis in the nature of aerodynamics, caused by the interactions between the incoming turbulent flow and the wind turbine blades. Hence, understanding the mechanisms of airfoil noise generation, demands access to sophisticated numerical tools. The processes of m

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Wang, Hanwei, Yue Chao, Tian Tang, Kai Luo, and Kan Qin. "A Comparison of Partial Admission Axial and Radial Inflow Turbines for Underwater Vehicles." Energies 14, no. 5 (2021): 1514. http://dx.doi.org/10.3390/en14051514.

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The metal fueled steam Rankine cycle has been successfully applied to Unmanned Underwater Vehicles. However, the suitable turbine configuration is yet to be determined for this particular application. In this paper, the mean-line design approach based on the existing empirical correlations is first described. The corresponding partial admission axial and radial inflow turbines are then preliminarily designed. To assess the performance of designed turbines, the three-dimensional Computational Fluid Dynamics (CFD) simulations and steady-state structural analysis are performed. The results show t

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Pierce, K., and A. C. Hansen. "Prediction of Wind Turbine Rotor Loads Using the Beddoes-Leishman Model for Dynamic Stall." Journal of Solar Energy Engineering 117, no. 3 (1995): 200–204. http://dx.doi.org/10.1115/1.2847783.

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The Beddoes-Leishman model for unsteady aerodynamics and dynamic stall has recently been implemented in YawDyn, a rotor analysis code developed at the University of Utah for the study of yaw loads and motions of horizontal axis wind turbines. This paper presents results obtained from validation efforts for the Beddoes model. Comparisons of predicted aerodynamic force coefficients with wind tunnel data and data from the combined experiment rotor are presented. Also, yaw motion comparisons with the combined experiment rotor are presented. In general the comparisons with the measured data are goo

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28

Pham, Thanh-Dam, Minh-Chau Dinh, Hak-Man Kim, and Thai-Thanh Nguyen. "Simplified Floating Wind Turbine for Real-Time Simulation of Large-Scale Floating Offshore Wind Farms." Energies 14, no. 15 (2021): 4571. http://dx.doi.org/10.3390/en14154571.

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Floating offshore wind has received more attention due to its advantage of access to incredible wind resources over deep waters. Modeling of floating offshore wind farms is essential to evaluate their impacts on the electric power system, in which the floating offshore wind turbine should be adequately modeled for real-time simulation studies. This study proposes a simplified floating offshore wind turbine model, which is applicable for the real-time simulation of large-scale floating offshore wind farms. Two types of floating wind turbines are evaluated in this paper: the semi-submersible and

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Blinov, Vitalii L., Oleg V. Komarov, and Egor A. Zaslavskiy. "Estimation of the driven gas turbine unit technical performance using the standard measuring systems." E3S Web of Conferences 178 (2020): 01044. http://dx.doi.org/10.1051/e3sconf/202017801044.

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In large pipeline gas transport systems the operation and maintenance of gas pumping units are carried according to the current number of equivalent working hours of centrifugal gas compressors and gas turbines. Modern terms of lean production require the maintenance procedure to be done according to the current technical performance of equipment. The paper presents a designed and verified methodology of technical performance estimation of gas turbine units using the standard measuring systems. This method includes a verified high-order mathematical model based on the gas dynamic function for

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Saryazdi, Seyed Mohammad E., and Mehrdad Boroushaki. "2D Numerical Simulation and Sensitive Analysis of H-Darrieus Wind Turbine." International Journal of Renewable Energy Development 7, no. 1 (2018): 23. http://dx.doi.org/10.14710/ijred.7.1.23-34.

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Recently, a lot of attention has been devoted to the use of Darrieus wind turbines in urban areas. The aerodynamics of a Darrieus turbine are very complex due to dynamic stall and changing forces on the turbine triggered by changing horizontal angles. In this study, the aerodynamics of H-rotor vertical axis wind turbine (VAWT) has been studied using computational fluid dynamics via two different turbulence models. Shear stress transport (SST) k-ω turbulence model was used to simulate a 2D unsteady model of the H-Darrieus turbine. In order to complete this simulation, sensitivity analysis of th

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31

Maniaci, David C., and Ye Li. "Investigating the Influence of the Added Mass Effect to Marine Hydrokinetic Horizontal-Axis Turbines Using a General Dynamic Wake Wind Turbine Code." Marine Technology Society Journal 46, no. 4 (2012): 71–78. http://dx.doi.org/10.4031/mtsj.46.4.4.

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AbstractThis paper describes a recent study to investigate the applicability of a horizontal-axis wind turbine structural dynamics and unsteady aerodynamics analysis program (FAST and AeroDyn, respectively) for modeling the forces on marine hydrokinetic turbines. This paper summarizes the added mass model that has been added to AeroDyn. The added mass model only includes flow acceleration perpendicular to the rotor disc and ignores added mass forces caused by blade deflection. A model of the National Renewable Energy Laboratory’s Unsteady Aerodynamics Experiment Phase VI wind turbine was analy

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Krivoy, Sergey Aleksandrovich, Nikolay Sergeevich Bolshakov, and Xeniya Mikhailovna Rakova. "Increasing the Wind Turbine Power Using Aerodynamics Shape of the Building." Applied Mechanics and Materials 725-726 (January 2015): 1456–62. http://dx.doi.org/10.4028/www.scientific.net/amm.725-726.1456.

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Energy saving techniques including the use of alternative energy sources become more and more popular. One of the alternative energy sources is wind. Wind turbines are highly relevant in the areas of wind (such as coasts). This paper proposes a method of increasing the power of wind turbine due to architectural solutions such as streamlining facade by the example of the school. The calculations of the real increase in wind speed and power of the selected wind turbine have been promoted. The payback period graphs of the unit have been discovered in two variants (with changing the façade and wi

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33

Bayati, I., M. Belloli, L. Bernini, et al. "UNAFLOW project: UNsteady Aerodynamics of FLOating Wind turbines." Journal of Physics: Conference Series 1037 (June 2018): 072037. http://dx.doi.org/10.1088/1742-6596/1037/7/072037.

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34

Ngoc, Hoang Thi Bich. "Calculating the aerodynamics of vertical axis wind turbines." Vietnam Journal of Mechanics 34, no. 3 (2012): 169–84. http://dx.doi.org/10.15625/0866-7136/34/3/2358.

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Vertical axis wind turbine technology has been applied last years, very long after horizontal axis wind turbine technology. Aerodynamic problems of vertical axis wind machines are discussible. An important problem is the determination of the incidence law in the interaction between wind and rotor blades. The focus of the work is to establish equations of the incidence depending on the blade azimuth, and to solve them. From these results, aerodynamic torques and power can be calculated. The incidence angle is a parameter of velocity triangle, and both the factors depend not only on the blade az

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Paraschivoiu, Ion, and Philippe Desy. "Aerodynamics of small-scale vertical-axis wind turbines." Journal of Propulsion and Power 2, no. 3 (1986): 282–88. http://dx.doi.org/10.2514/3.22882.

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Rajaram Narayanan, M., S. Nallusamy, and M. Ragesh Sathiyan. "Design and Analysis of a Wind Turbine Blade with Dimples to Enhance the Efficiency through CFD with ANSYS R16.0." MATEC Web of Conferences 207 (2018): 02004. http://dx.doi.org/10.1051/matecconf/201820702004.

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In the global scenario, wind turbines and their aerodynamics are always subjected to constant research for increasing their efficiency which converts the abundant wind energy into usable electrical energy. In this research, an attempt is made to increase the efficiency through the changes in surface topology of wind turbines through computational fluid dynamics. Dimples on the other hand are very efficient in reducing air drag as is it evident from the reduction of drag and increase in lift in golf balls. The predominant factors influencing the efficiency of the wind turbines are lift and drag

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Kądrowski, Damian, Michał Kulak, Michał Lipian, et al. "Challenging low Reynolds - SWT blade aerodynamics." MATEC Web of Conferences 234 (2018): 01004. http://dx.doi.org/10.1051/matecconf/201823401004.

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One of the main issues related to the design and development of small wind turbines (SWTs) is the low Reynolds number. Operation in the transitory regime makes the rotor aerodynamic analysis a challenging task. Project GUST (Generative Urban Small Turbine) realized currently at the Institute of Turbomachinery (Lodz University of Technology, Poland) is devoted to the development of SWT (D = 1.6 m) for low-Reynolds number (low wind speed) flow conditions. The emphasis is on the blade design, aiming at improving the rotor aerodynamic efficiency. The paper will highlight the rotor design process,

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Rubio, Francisco, and Carlos Llopis-Albert. "Viability of using wind turbines for electricity generation in electric vehicles." Multidisciplinary Journal for Education, Social and Technological Sciences 6, no. 1 (2019): 115. http://dx.doi.org/10.4995/muse.2019.11743.

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<p class="Textoindependiente21">This paper presents a feasibility study of applying a fluid energy recovery system by means of wind turbines for charging batteries of electric vehicles. This is because the main disadvantage of electric vehicles with regard to conventional fuel automobiles is the scarce capacity of storing sufficient energy to run long distances. This can be carried out by recovering a percentage of the energy used to overcome the aerodynamic drag of the vehicle. This work analysis different case studies, with different driving modes, to quantify the theoretical energy re

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Shen, Xin, Xiaocheng Zhu, and Zhaohui Du. "Load control and unsteady aerodynamics for floating wind turbines." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 235, no. 6 (2021): 1501–26. http://dx.doi.org/10.1177/0957650921993255.

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Unlike fixed-base offshore wind turbine, the soft floating platform introduces 6 more degrees of freedom of motions to the floating offshore wind turbine. This may cause much more complex inflow environment to the wind turbine rotors compared with fixed-base wind turbine. The wind seen locally on the blade changes due to the motions of the floating wind turbine platform which has a direct impact on the aerodynamic condition on the blade such as the angle of attack and the inflow velocity. Such unsteady aerodynamic effects may lead to high fluctuation of the loads and power output. The present

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Torres-Madroñero, José Luis, Joham Alvarez-Montoya, Daniel Restrepo-Montoya, Jorge Mario Tamayo-Avendaño, César Nieto-Londoño, and Julián Sierra-Pérez. "Technological and Operational Aspects That Limit Small Wind Turbines Performance." Energies 13, no. 22 (2020): 6123. http://dx.doi.org/10.3390/en13226123.

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Small Wind Turbines (SWTs) are promissory for distributed generation using renewable energy sources; however, their deployment in a broad sense requires to address topics related to their cost-efficiency. This paper aims to survey recent developments about SWTs holistically, focusing on multidisciplinary aspects such as wind resource assessment, rotor aerodynamics, rotor manufacturing, control systems, and hybrid micro-grid integration. Wind resource produces inputs for the rotor’s aerodynamic design that, in turn, defines a blade shape that needs to be achieved by a manufacturing technique wh

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Chen, T. Y., C. W. Hung, and Y. T. Liao. "Experimental Study on Aerodynamics of Micro-Wind Turbines with Large-Tip non-Twisted Blades." Journal of Mechanics 29, no. 3 (2013): N15—N20. http://dx.doi.org/10.1017/jmech.2013.35.

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AbstractThis research experimentally investigates the rotor aerodynamics of horizontal-axis, micro-wind turbines. Specifically, the aerodynamic characteristics of large-tip, non-twisted blades are studied. The study is conducted in a wind tunnel system to obtain the relations between the power coefficient (CP) and tip speed ratio (TSR), the torque coefficient (CT) and TSR. Effects of rotor position inside a flanged diffuser, rotor solidity and blade number on rotor performance are investigated. The blade cross-section is NACA4415 airfoil. The pitch angle of the blades is fixed at 30°, and the

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Berchiolli, Guarda, Walsh, and Pesyridis. "Turbocharger Axial Turbines for High Transient Response, Part 2: Genetic Algorithm Development for Axial Turbine Optimisation." Applied Sciences 9, no. 13 (2019): 2679. http://dx.doi.org/10.3390/app9132679.

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In a previous paper [1], a preliminary design methodology was proposed for the design of an axial turbine, replacing a conventional radial turbine used in automotive turbochargers, to achieve improved transient response, due to the intrinsically lower moment of inertia. In this second part of the work, the focus is on the optimisation of this preliminary design to improve on the axial turbine efficiency using a genetic algorithm in order to make the axial turbine a more viable proposition for turbocharger turbine application. The implementation of multidisciplinary design optimisation is essen

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Vladimir, CARDOS. "Small Vertical Axis Wind Turbines: aerodynamics and starting behavior." INCAS BULLETIN 5, no. 4 (2013): 45–53. http://dx.doi.org/10.13111/2066-8201.2013.5.4.5.

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Leishman, J. Gordon. "Challenges in modelling the unsteady aerodynamics of wind turbines." Wind Energy 5, no. 2-3 (2002): 85–132. http://dx.doi.org/10.1002/we.62.

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Shen, Xin, Jinge Chen, Ping Hu, Xiaocheng Zhu, and Zhaohui Du. "Study of the unsteady aerodynamics of floating wind turbines." Energy 145 (February 2018): 793–809. http://dx.doi.org/10.1016/j.energy.2017.12.100.

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Mitchell, Samuel, Iheanyichukwu Ogbonna, and Konstantin Volkov. "Aerodynamic Characteristics of a Single Airfoil for Vertical Axis Wind Turbine Blades and Performance Prediction of Wind Turbines." Fluids 6, no. 7 (2021): 257. http://dx.doi.org/10.3390/fluids6070257.

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The design of wind turbines requires a deep insight into their complex aerodynamics, such as dynamic stall of a single airfoil and flow vortices. The calculation of the aerodynamic forces on the wind turbine blade at different angles of attack (AOAs) is a fundamental task in the design of the blades. The accurate and efficient calculation of aerodynamic forces (lift and drag) and the prediction of stall of an airfoil are challenging tasks. Computational fluid dynamics (CFD) is able to provide a better understanding of complex flows induced by the rotation of wind turbine blades. A numerical si

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Chen, Jin, Jiang Tao Cheng, and Wen Zhong Shen. "Research on Design Methods and Aerodynamics Performance of CQU-DTU-B21 Airfoil." Advanced Materials Research 455-456 (January 2012): 1486–90. http://dx.doi.org/10.4028/www.scientific.net/amr.455-456.1486.

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This paper presents the design methods of CQU-DTU-B21 airfoil for wind turbine. Compared with the traditional method of inverse design, the new method is described directly by a compound objective function to balance several conflicting requirements for design wind turbine airfoils, which based on design theory of airfoil profiles, blade element momentum (BEM) theory and airfoil Self-Noise prediction model. And then an optimization model with the target of maximum power performance on a 2D airfoil and low noise emission of design ranges for angle of attack has been developed for designing CQU-

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Mancini, Simone, Koen Boorsma, Marco Caboni, et al. "Characterization of the unsteady aerodynamic response of a floating offshore wind turbine to surge motion." Wind Energy Science 5, no. 4 (2020): 1713–30. http://dx.doi.org/10.5194/wes-5-1713-2020.

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Abstract. The disruptive potential of floating wind turbines has attracted the interest of both the industry and the scientific community. Lacking a rigid foundation, such machines are subject to large displacements whose impact on aerodynamic performance is not yet fully explored. In this work, the unsteady aerodynamic response to harmonic-surge motion of a scaled version of the DTU 10 MW turbine is investigated in detail. The imposed displacements have been chosen representative of typical platform motion. The results of different numerical models are validated against high-fidelity wind tun

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Eggleston, D. M., and K. Starcher. "A Comparative Study of the Aerodynamics of Several Wind Turbines Using Flow Visualization." Journal of Solar Energy Engineering 112, no. 4 (1990): 301–9. http://dx.doi.org/10.1115/1.2929938.

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Flow visualization techniques were used to study the flows over the Enertech 21-5, Carter 25, and Enertech 44-50. Despite centrifugal effects superimposed on the aerodynamics, tufting (gross aerodynamic behavior) and oil flow (average boundary layer behavior), tests reveal the nature and many of the details of the flows involved. Results were compared to expected flow patterns based on angles of attack calculated from the PROPPC code. Chord Reynolds numbers ranged between 75,000 (Enertech 21-5) to 1,340,000 (Enertech 44-50). The typical low Reynolds number flow characteristics of these airfoil

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Horb, S., R. Fuchs, A. Immas, F. Silvert, and P. Deglaire. "Variable pitch control for vertical-axis wind turbines." Wind Engineering 42, no. 2 (2018): 128–35. http://dx.doi.org/10.1177/0309524x18756972.

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NENUPHAR aims at developing the next generation of large-scale floating offshore vertical-axis wind turbine. To challenge the horizontal-axis wind turbine, the variable blade pitch control appears to be a promising solution. This article focuses on blade pitch law optimization and resulting power and thrust gain depending on the operational conditions. The aerodynamics resulting from the implementation of a variable blade pitch control are studied through numerical simulations, either with a three-dimensional vortex code or with two-dimensional Navier-stokes simulations (two-dimensional comput

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