Journal articles: 'Darrieus wind turbine'

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Hakim, Luthfi, Achmad Rijano, and Mochamad Muzaki. "Analisis Regresi Kecepatan Angin Terhadap Daya Turbin Angin Jenis VAWT Tipe Darrieus-Savonius." Jurnal Energi dan Teknologi Manufaktur (JETM) 1, no. 02 (2018): 15–20. http://dx.doi.org/10.33795/jetm.v1i02.16.

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The Darrieus-Savonius (DS) wind turbine has been widely developed with the aim of improving turbine performance that has been designed. DS wind turbine is a combination of two type of wind turbines, that is Darrieus and Savonius turbine, both turbines are intentionally developed In order to get self-starting on turbine Savonius with low wind speed and able to extract the speed of engine into energy well at high wind speed through Cherrie Darrieus. This study was conducted to analyze the performance of the DS turbine in the wind speed to be energized through the turbine rotation and power to be generated. The DS wind turbine is designed to start rotating at a speed of 8 m/s in velocity of wind, meanwhile the maximum power generated by turbine is 48,23 Watts.

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Mohan Kumar, Palanisamy, Krishnamoorthi Sivalingam, Teik-Cheng Lim, Seeram Ramakrishna, and He Wei. "Strategies for Enhancing the Low Wind Speed Performance of H-Darrieus Wind Turbine—Part 1." Clean Technologies 1, no. 1 (2019): 185–204. http://dx.doi.org/10.3390/cleantechnol1010013.

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Small wind turbines are key devices for micro generation in particular, with a notable contribution to the global wind energy sector. Darrieus turbines, despite being highly efficient among various types of vertical axis turbines, received much less attention due to their starting characteristics and poor performance in low wind speeds. Radically different concepts are proposed as a potential solution to enhance the performance of Darrieus turbine in the weak wind flows, all along the course of Darrieus turbine development. This paper presents a comprehensive review of proposed concepts with the focus set on the low wind speed performance and critically assessing their applicability based on economics, reliability, complexity, and commercialization aspects. The study is first of its kind to consolidate and compare various approaches studied on the Darrieus turbine with the objective of increasing performance at low wind. Most of the evaluated solutions demonstrate better performance only in the limited tip speed ratio, though they improve the low wind speed performance. Several recommendations have been developed based on the evaluated concepts, and we concluded that further critical research is required for a viable solution in making the Darrieus turbine a low speed device.

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Effendi, Rian, and Rudi Siswanto. "PROSES MANUFAKTUR TURBIN ANGIN SUMBU VERTIKAL TIPE DARRIEUS." JTAM ROTARY 1, no. 2 (2019): 117. http://dx.doi.org/10.20527/jtam_rotary.v1i2.1742.

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Wind turbine is one of the tools yamg work to take advantage of wind allergy. Wind turbines based on the type of rotor there are two types of Darrieus wind turbines and Savonius wind turbines. In the manufacturing process using a type of wind turbine type Darrieus. The darrieus turbine is a wind turbine that utilizes the lift style on the rotor blade. This turbine requires initial energy to spin. The formulation of the problem in making this wind turbine is How does the manufacturing process of vertical turbine type darrieus wind turbine and How much is the cost budget on the manufacturing process of the darrieus type verical wind turbine. The components of the wind turbine are the foot frame, bearing bearings, bearings, shafts, disks, blade arms, blades, transmission pulleys and belts-v, while the tools and machinery used in the manufacturing process are electric welding tools, electric grinding wheels, , hand drilling machine, sitting drilling machine, cut lever, riverter pliers, acetylene welding and lathe. Keywords: Wind Turbine, Turbine Components, Tools and MachinesApple, JM. Tata Letak Pabrik dan Pemindahan Bahan. Bandung : Penerbit ITB, Terj. Nurhayati Mardiono.,1990.Maheswari Hesti,Achmad Dany Firdauzy.2015. “Evaluasi Tata Letak Fasilitas Produksi Untuk Meningkatkan Efisiensi Kerja Pada Pt. Nusa Multilaksana. Fakultas Ekonomi”. Jakarta:Universitas Mercu Buana.Susetyo Joko dkk.2010. “Perancangan Ulang Tata Letak Fasilitas Produksi Dengan Pendekatan Group Technology Dan Algoritma Blocplan Untuk Meminimasi Ongkos Material Handling”. yogyakarta:AKPRIND.Nova St Meirizha. 2014. “Perancangan Ulang Tata Letak Fasilitas Pada Hanggar Pemeliharaan Pesawat Hawk 100/200 Di Pangkalan Udara Roesmin Nurjadin”. Riau: Program Studi Teknik Industri, Fakultas Teknik,Universitas Muhammadiyah.Wignjosoebroto, sritomo. Tata letak pabrik dan pemindahan bahan. Surabaya: penerbit guna widya., 1996.

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Sahim, Kaprawi, Dyos Santoso, and Dewi Puspitasari. "Investigations on the Effect of Radius Rotor in Combined Darrieus-Savonius Wind Turbine." International Journal of Rotating Machinery 2018 (2018): 1–7. http://dx.doi.org/10.1155/2018/3568542.

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Renewable sources of energy, abundant in availability, are needed to be exploited with adaptable technology. For wind energy, the wind turbine is very well adapted to generate electricity. Among the different typologies, small scale Vertical Axis Wind Turbines (VAWT) present the greatest potential for off-grid power generation at low wind speeds. The combined Darrieus-Savonius wind turbine is intended to enhance the performance of the Darrieus rotor in low speed. In combined turbine, the Savonius buckets are always attached at the rotor shaft and the Darrieus blades are installed far from the shaft which have arm attaching to the shaft. A simple combined turbine offers two rotors on the same shaft. The combined turbine that consists of two Darrieus and Savonius blades was tested in wind tunnel test section with constant wind velocity and its performance was assessed in terms of power and torque coefficients. The study gives the effect of the radius ratio between Savonius and Darrieus rotor on the performance of the turbine. The results show that there is a significant influence on the turbine performance if the radius ratio was changed.

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Puspitasari, Dewi, and Kaprawi Sahim. "Effect of Savonius blade height on the performance of a hybrid Darrieus-Savonius wind turbine." Journal of Mechanical Engineering and Sciences 13, no. 4 (2019): 5832–47. http://dx.doi.org/10.15282/jmes.13.4.2019.09.0465.

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A vertical hybrid turbine commonly consists of a Darrieus and Savonius rotor where the Savonius is inside Darrieus turbine. This paper describes the experimental study of hybrid Darrieus-Savonius wind turbines by variation in Savonius blade height. In this case, the effect of the blade height of the Savonius blade was studied experimentally in a subsonic wind tunnel. The effect of the height of a Savonius blade relative to that of Darrieus called blade height ratios δ was investigated to know the hybrid turbine performance. The performance is represented by power and torque coefficient. The result shows that the hybrid turbine with height ratio greater than unity δ = 1.4 gives the highest power CP = 0.20 and torque coefficient CT = 0.129. It is investigated that the torque and the power coefficient have a higher value than that of Darrieus turbine, in which the increase in power and torque coefficient are 48% and 29%, respectively. This hybrid wind turbine with a blade height ratio greater than unity can be considered as an important variable in the wind turbine construction.

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Кауаn, V. "DARRIEUS TYPE WIND TURBINE WITH CONTROLLED BLADES." Eurasian Physical Technical Journal 17, no. 2 (2020): 69–72. http://dx.doi.org/10.31489/2020no2/69-72.

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The results of studies on possibility of increasing efficiency in the use of wind energy and improving the dynamic characteristics of Darrieus wind turbine with straight blades are described. It is shown how the values of torque on the rotor shaft may be optimized by controlling the orientation of the turbine blades relative to the oncoming flow. Control of blades was provided with a cylindrical track of the special form in plan. The track form allowed to establish optimum angle of attack on each site of blade circular trajectory. It allowed to increase power coefficient Cp by 1.5 times and to reduce wind speed at which there is self-start of the wind turbine

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Qu, Jian Jun, Ming Wei Xu, and Yi Mei. "Aerodynamic Model of Vertical Axis Wind Turbine with Wind Speed Self-Adapting in Drag-Mode." Advanced Materials Research 347-353 (October 2011): 340–43. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.340.

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The structure of vertical axis wind turbine with wind speed-adapting is based on Darrieus straight-bladed turbine. It features that its blades are composed of movable and fixed blades. Through the opening and closing of the movable blades to adapt to the wind speed automatically, the turbine not only can start up in low wind speed, but also realize the conversion from drag-mode to lift-mode. Due to the special structure, the aerodynamic model of this turbine in drag-mode is different from that of Savonius and Darrieus turbine. So in this article, the aerodynamic model of this turbine in drag-mode is established. Then the coefficient of start-up torque is calculated and compared with that of Darrieus straight-bladed turbine which has the same size. The results show that the start-up performance of this turbine is obviously better than that of Darrieus straight-bladed turbine.

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Chua, Bih Lii, Mohd Suffian Misaran, Yan Yan Farm, Mizanur Rahman, and Benjoe Eldana Barahim. "Development of Mixed Vertical Axis Wind Turbine (MVAWT) for Low Wind Condition." Applied Mechanics and Materials 660 (October 2014): 811–15. http://dx.doi.org/10.4028/www.scientific.net/amm.660.811.

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Small-scaled renewable energy generation such as micro-hydro and domestic solar panel has become the recent trend of research in order to achieve sustainable energy generation and to eliminate the reliance of geographical selection and large farm area. As for the case of wind energy, a wind turbine that can operate at low wind condition are desirable. This paper presents a mixed design for Vertical Axis Wind Turbine comprises of Savonius and Darrieus rotors, being assembled together as a single rotor turbine. The mixed wind turbine model (MVAWT) was fabricated and tested in our lab as prove of concept. Experiments conducted on 5 MVAWT’s configurations and being compared to a standalone Darrieus turbine with +3 degree pitch angle, showed promising result in lowering the self-start speed of the Darrieus turbine. It was observed that all the positive pitch angle MVAWTs has started to rotate at lower wind speed (about 1.8 m/s) while the standalone Darrieus turbine was only started to rotate at wind speeds more than 3.0 m/s. However, the lower self-start were also being compensated by lower turbine rotational speed. With the low self-start speed in the MVAWT, it will enable the wind energy capture for a longer period of time at a low wind condition site. This development should lead to an interesting research on optimizing the mixture of Savonius and Darrieus turbine for a localized low wind speed conditions in the future.

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Mohan Kumar, Palanisamy, Mohan Ram Surya, Krishnamoorthi Sivalingam, Teik-Cheng Lim, Seeram Ramakrishna, and He Wei. "Computational Optimization of Adaptive Hybrid Darrieus Turbine: Part 1." Fluids 4, no. 2 (2019): 90. http://dx.doi.org/10.3390/fluids4020090.

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Darrieus-type Vertical Axis Wind Turbines (VAWT) are promising for small scale decentralized power generation because of their unique advantages such as simple design, insensitive to wind direction, reliability, and ease of maintenance. Despite these positive aspects, poor self-starting capability and low efficiency in weak and unsteady winds deteriorate further development. Adaptive Hybrid Darrieus Turbine (AHDT) was proposed by the author in the past study as a potential solution to enhance low wind speed characteristics. The objective of the current research is to optimize the parameters of AHDT. AHDT integrates a dynamically varying Savonius rotor with a Darrieus rotor. A fully detailed 2D numerical study employing Reynold-Averaged Navier Stokes (RANS) is carried out to investigate the impact of the Darrieus rotor diameter (DR) on the Savonius rotor (DT) with regard to hybrid turbine performance. The power coefficient of the Darrieus rotor is evaluated when the Savonius rotor is in the closed condition (cylinder) of various diameters. The influence of Reynolds number (Re) on the torque coefficient is examined. Power loss of 58.3% and 25% is reported for DR/DT ratio of 1.5 and 2 respectively for AHDT with solidity 0.5 at 9 m/s. The flow interaction between the Savonius rotor in closed configuration reveals the formation of von Karman vortices that interact with Darrieus blades resulting in flow detachment. An optimum diametrical ratio (DR/DT) of 3 is found to yield the maximum power coefficient of the Darrieus rotor.

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Weber, Johannes, Stefan Becker, Christoph Scheit, Jens Grabinger, and Manfred Kaltenbacher. "Aeroacoustics of Darrieus Wind Turbine." International Journal of Aeroacoustics 14, no. 5-6 (2015): 883–902. http://dx.doi.org/10.1260/1475-472x.14.5-6.883.

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Ponta, Fernando L., Alejandro D. Otero, and Lucas Lago. "The VGOT Darrieus wind turbine." International Journal of Global Energy Issues 21, no. 3 (2004): 303. http://dx.doi.org/10.1504/ijgei.2004.005774.

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Iliev, Rossen. "A CFD analysis of the performance characteristics of different Darrieus turbine runners." E3S Web of Conferences 207 (2020): 02012. http://dx.doi.org/10.1051/e3sconf/202020702012.

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This paper presents the capabilities of analyzing different Darrieus wind turbine runners with the computer program Ansys Fluent. A K-omega turbulence model was used in the case of a two-dimensional flow with a suitable computational grid around the profile of the blades. The obtained theoretical performance characteristics were validated on test rig №7 (Wind Turbines) in the Laboratory of Hydropower and Hydraulic Turbomachinery (HEHT Lab) at the Technical University of Sofia. The data analysis shows that it’s possible to predict the performance characteristic and the optimum operating regime of the Darrieus wind turbine.

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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. This paper provides a detailed review of past and current studies of the H-Darrieus turbine from the perspective of design parameters including turbine solidity, blade profile, pitch angle, etc. and particular focus is put on the crucial challenge to design a turbine that will self-start. Moreover, this paper summarizes the main research approaches for studying the turbine in order to identify successes and promising areas for future study.

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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 the effective turbine parameters such as solidity factor, airfoil shape, wind velocity and shaft diameter were done. To simulate the flow through the turbine, a 2D simplified computational domain has been generated. Then fine mesh for each case consisting of different turbulence models and dimensions has been generated. Each mesh in this simulation dependent on effective parameters consisted of domain size, mesh quality, time step and total revolution. The sliding mesh method was applied to evaluate the unsteady interaction between the stationary and rotating components. Previous works just simulated turbine, while in our study sensitivity analysis of effective parameters was done. The simulation results closely match the experimental data, providing an efficient and reliable foundation to study wind turbine aerodynamics. This also demonstrates computing the best value of the effective parameter. The sensitivity analysis revealed best value of the effective parameter that could be used in the process of designing turbine. This work provides the first step in developing an accurate 3D aerodynamic modeling of Darrieus wind turbines.Article History: Received :August 19th 2017; Received: December 15th 2017; Accepted: Januari 14th 2018; Available onlineHow to Cite This Article: Saryazdi, S. M. E. and Boroushaki, M. (2018) 2D Numerical Simulation and Sensitive Analysis of H-Darrieus Wind Turbine. Int. Journal of Renewable Energy Development,7(1),23-34https://doi.org/10.14710/ijred.7.1.23-24

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Alqurashi, Faris, and M. H. Mohamed. "Aerodynamic Forces Affecting the H-Rotor Darrieus Wind Turbine." Modelling and Simulation in Engineering 2020 (January 11, 2020): 1–15. http://dx.doi.org/10.1155/2020/1368369.

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Darrieus wind rotor is a vertical axis wind turbine that is a very promising kind of wind converters at remote and domestic locations that have soft and weak wind potential and speed, but from the quantitative comparison with horizontal axis wind turbines, this type of turbines has a weak performance. Additional researches are still needed to develop its efficiency to identify all the requirements of the generated power in low power demands. The aim of the current investigation is to analyze all the acting forces on the main parts of Darrieus rotor over the rotations as well as in maintenance and stationary conditions. Aerodynamic forces assessment will be executed for 3 different blade shapes (nonsymmetric and symmetric airfoils) like the airfoil section shapes of the Darrieus rotor blades. NACA 0021, LS413, and S1046 are selected as cross-sectional profile in this work. CFD simulations have been used in this work to get the different aerodynamic forces on the rotor blades of the Darrieus turbines. The present results indicated that the symmetric S1046 blade has higher forces during the rotation and stagnant (static) conditions. Moreover, the self-starting capability of NACA 0021 is better than S1046 due to low aerodynamic torsion on the S1046 blades.

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Ghiasi, Pedram, Gholamhassan Najafi, Barat Ghobadian, and Ali Jafari. "Analytical and Numerical Solution for H-type Darrieus Wind Turbine Performance at the Tip Speed Ratio of Below One." International Journal of Renewable Energy Development 10, no. 2 (2020): 269–81. http://dx.doi.org/10.14710/ijred.2021.33169.

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H-type Darrieus vertical axis wind turbines (VAWT) have omnidirectional movement capability and can get more power compared to other VAWTs at high tip speed ratios (𝜆). However, its disadvantages are self-starting inability and low generated power at 𝜆 less than 1. The performance of H-type Darrieus wind turbine at 𝜆<1 was studied using double multiple stream tube (DMST) model and two-dimensional computational fluid dynamic (CFD) simulation. In CFD simulation, the Unsteady Reynolds Averaged Navier-Stokes (URANS) equations were used and the turbulence model was solved with SST k-ω model. The performance of fifteen various wind turbines was determined at fourteen wind velocities by two solution methods. The effect of chord length, solidity, Reynolds number and Height to Diameter (H/D) ratio were investigated on generated torque, power and the time required to reach 𝜆=0.1. Increasing in the moment of inertia due to the increasing in required time to reach 𝜆=0.1. In the low TSRs, the wind turbines can generate higher torque and power in high Re numbers and solidities. The required time was reduced by an increase in Re number and solidity. Finally, the best ratio of H/D of H-type Darrieus wind turbines was defined to improve the turbine performance.

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Diaurahman, Diaurahman, and Rudi Siswanto. "PERENCANAAN KONSTRUKSI DAN ELEMEN MESIN TURBIN ANGIN SUMBU VERTIKAL TYPE DARRIEUS." Scientific Journal of Mechanical Engineering Kinematika 1, no. 2 (2016): 99–112. http://dx.doi.org/10.20527/sjmekinematika.v1i2.30.

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Wind energi is one of the alternative energi that can be utilized for various purposes to replace the source of fossil fuel energi. The Darrieus wind turbine includes a vertikal axis wind turbine driven by lifting force from the blade. Planning of the axis vertikal type Darrieus wind turbine is aimed to calculate the elements of Darrieus machine and make design of vertikal axis component of Darrieus vertikal turbine using Marzuki (2016) research data about NACA 2415 blend analysis with variation of blade and angle of attack. The planning method used is based on the calculation of construction and vertikal axis of vertikal axis type of wind machine by using field result data in the form of wind speed, altitude and environmental condition which produce calculation result and working drawing of each machine element. The results of planning engine eleman on vertikal axis wind turbine Darrieus with 3 pieces airfoil shaped type NACA 2415 chord 30 cm has a diameter and height of 1 meter. Using ST-42 shaft 17-25 mm in diameter with length 1640 mm retained 2 bearing pieces with numbers 30203 and 6204. Transmission using belt and pulley type with 1: 14 increase ratio. Frame using Lx steel profile size 30x30 with total length ± 15 m. The use of materials such as composites is preferable to reduce turbine load without affecting the strength and durability of the turbine.

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Yohana, Eflita, MSK Tony Suryo U, Binawan Luhung, Mohamad Julian Reza, and M. Badruz Zaman. "Experimental Study of Wind Booster Addition for Savonius Vertical Wind Turbine of Two Blades Variations Using Low Wind Speed." E3S Web of Conferences 125 (2019): 14003. http://dx.doi.org/10.1051/e3sconf/201912514003.

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The Wind turbine is a tool used in Wind Energy Conversion System (WECS). The wind turbine produces electricity by converting wind energy into kinetic energy and spinning to produce electricity. Vertical Axis Wind Turbine (VAWT) is designed to produce electricity from winds at low speeds. Vertical wind turbines have 2 types, they are wind turbine Savonius and Darrieus. This research is to know the effect of addition wind booster to Savonius vertical wind turbine with the variation 2 blades and 3 blades. Calculation the power generated by wind turbine using energy analysis method using the concept of the first law of thermodynamics. The result obtained is the highest value of blade power in Savonius wind turbine without wind booster (16.5 ± 1.9) W at wind speed 7 m/s with a tip speed ratio of 1.00 ± 0.01. While wind turbine Savonius with wind booster has the highest power (26.3 ± 1.6) W when the wind speed of 7 m/s with a tip speed ratio of 1.26 ± 0.01. The average value of vertical wind turbine power increases Savonius after wind booster use of 56%.

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Khudri Johari, Muhd, Muhammad Azim A Jalil, and Mohammad Faizal Mohd Shariff. "Comparison of horizontal axis wind turbine (HAWT) and vertical axis wind turbine (VAWT)." International Journal of Engineering & Technology 7, no. 4.13 (2018): 74. http://dx.doi.org/10.14419/ijet.v7i4.13.21333.

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As the demand for green technology is rising rapidly worldwide, it is important that Malaysian researchers take advantage of Malaysia’s windy climates and areas to initiate more power generation projects using wind. The main objectives of this study are to build a functional wind turbine and to compare the performance of two types of design for wind turbine under different speeds and behaviours of the wind. A three-blade horizontal axis wind turbine (HAWT) and a Darrieus-type vertical axis wind turbine (VAWT) have been designed with CATIA software and constructed using a 3D-printing method. Both wind turbines have undergone series of tests before the voltage and current output from the wind turbines are collected. The result of the test is used to compare the performance of both wind turbines that will imply which design has the best efficiency and performance for Malaysia’s tropical climate. While HAWT can generate higher voltage (up to 8.99 V at one point), it decreases back to 0 V when the wind angle changes. VAWT, however, can generate lower voltage (1.4 V) but changes in the wind angle does not affect its voltage output at all. The analysis has proven that VAWT is significantly more efficient to be built and utilized for Malaysia’s tropical and windy climates. This is also an initiative project to gauge the possibility of building wind turbines, which could be built on the extensive and windy areas surrounding Malaysian airports.

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Ion, NILA, BOGATEANU Radu, and STERE Marcel. "Small power wind turbine (Type DARRIEUS)." INCAS BULLETIN 4, no. 1 (2012): 135–42. http://dx.doi.org/10.13111/2066-8201.2012.4.1.14.

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Wicaksono, Hangga, Sugeng Hadi Susilo, Bayu Pranoto, and Muhammad Fakhruddin. "Initial Rotation Characteristic Investigation of a Hybrid Savonius - Darrieus Wind Turbine using 6 DOF Computational Fluid Dynamics." Mekanika: Majalah Ilmiah Mekanika 20, no. 1 (2021): 9. http://dx.doi.org/10.20961/mekanika.v20i1.47577.

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The inconsistency of the wind flow considered as one of the factors which tend to decrease the performance of the wind turbine. This paper proposes a further analysis of the initial rotation characteristic of a hybrid Savonius - Darrieus wind turbine. The addition of the Darrieus blade intends to increase the aerodynamic stability of the overlapping Savonius turbine. This study implements 2D CFD transient analysis using the 6DOF methods in 00, 300, 600, and 900 Darrieus blade position along with 2 m/s, 4 m/s, and 6 m/s wind speed variations. The results of the aerodynamic analysis show that the location of the Darrieus 300 turbine provides the greatest initial repulsion, especially when the turbine rotation is above 900, the position of the Darrieus blade can provide additional impulse force when the Savonius turbine tends to be passive. This effect occurs more significant at higher wind speeds. Savonius with 3-blade modification has a more stable level of force distribution than the 2-blade modification, although the value is smaller. This shows that the 3-blade Savonius provide a higher stability of angular velocity development.

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Mon, Thuzar, and Supakit Worasinchai. "Performance modelling of the Darrieus wind turbine." E3S Web of Conferences 302 (2021): 01001. http://dx.doi.org/10.1051/e3sconf/202130201001.

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Three-dimensional numerical investigation of the Darrieus wind turbines equipped with different aerofoils is presented in this paper. In the modelling, the computational domain was divided into three different domains and they are blade, rotor, and tunnel domains. A cylindrical domain was created to cover the blade area so that a fine mesh can be applied. The Computational Fluid Dynamics (CFD) was employed to solve and analyze the flow field around the turbine. The Menter Shear Stress turbulence model was chosen in this investigation. Boundary conditions applied were velocity at the inlet, pressure opening at the outlet, and symmetry on other sides. Comparison of simulation results and experiments showed good agreement. The investigation of the effects of the rotor solidity and the aerofoil shape was performed. The simulation results reveal that the aerofoil shape has a significant impact on the turbine performance. For the rotor solidity of 0.7, the change from the NACA section to the S1046 leads to a reduction of power at low tip speed ratios but the performance improvement is observed when the tip speed ratio is greater than 1.5. With the lower solidity of 0.375, the effects of the aerofoil change is less pronounced at low tip speed ratios. Nevertheless, the maximum power coefficient increases for both cases. Further analysis shows that the S1046 is less sensitive to the wind speed change and is promising in the urban application where the wind speed is relatively low.

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Alfian, Mizar, Poppy Puspitasari, Ahmad Taufiq, Muhammad Trifiananto, and A. Aripriharta. "An experimental test of the effect of cup diameter on the power performance of novel design HC-type VAWT." Journal of Applied Engineering Science 18, no. 4 (2020): 631–36. http://dx.doi.org/10.5937/jaes0-25010.

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Wind energy is one solution to overcome the energy problem in Indonesia. This study aimed to analyze the effect of cup diameter on the power performance of an HC-type vertical axis wind turbine (VAWT). The wind turbine used a combination of an H-type Darrieus wind turbine and a type-C rotor VAWT. The Darrieus HC-rotor wind turbine blade has a height H = 800 mm and diameter D = 800 mm with C-rotor variations on the tip with diameters of 76,2, 101,6, and 152,4 mm. The wind tunnel used an electric motor with a power of 1 HP (740 Watt) and 1400 rpm connected to a fan. The variation of wind speed was set to 2, 3, 4, 5, 6 and 7 m/s. The results showed that: (a) the highest rotation speedal speed was achieved by the HC-rotor diameter of 76,2 on 105 rpm with a wind speed of 7 m/s; (b) the highest value of the coefficient of power (Cp) is achieved by the HC-rotor diameter of 101,6mm (c) the highest value of the coefficient of torque (Ct) is achieved with the HC-rotor diameter of 152,4mm (d) the Darrieus HC-rotor wind turbine is suitable to be used in tropical regions that have low wind speeds. This result provides important information about the effect of the C rotor radius on the performance of HC-rotor Darrieus wind turbine blade vertical axis.

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Mertens, Sander, Gijs van Kuik, and Gerard van Bussel. "Performance of an H-Darrieus in the Skewed Flow on a Roof1." Journal of Solar Energy Engineering 125, no. 4 (2003): 433–40. http://dx.doi.org/10.1115/1.1629309.

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Application of wind turbines on roofs of higher buildings is a subject of increasing interest. However, the wind conditions at the roof are complex and suitable wind turbines for this application are not yet developed. This paper addresses both issues: the wind conditions on the roof and the behavior of a roof-located wind turbine with respect to optimized energy yield. Vertical Axis Wind Turbines (VAWTs) are to be preferred for operation in a complex wind environment as is found on top of a roof. Since the wind vector at a roof is not horizontal, wind turbines on a roof operate in skewed flow. Thus the behavior of an H-Darrieus (VAWT) is studied in skewed flow condition. Measurements showed that the H-Darrieus produces an increased power output in skewed flow. The measurements are compared with a model based on Blade Element Momentum theory that also shows this increased power output. This in contradiction to a HAWT in skewed flow which suffers from a power decrease. The paper thus concludes that due to this property an H-Darrieus is preferred above the HAWT for operation on a flat roof of higher buildings.

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Ramlee, Muhamad Fadhli, Ahmad Fazlizan, and Sohif Mat. "Performance Evaluation of H-Type Darrieus Vertical Axis Wind Turbine with Different Turbine Solidity." Journal of Computational and Theoretical Nanoscience 17, no. 2 (2020): 833–39. http://dx.doi.org/10.1166/jctn.2020.8726.

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Among renewable energy resources, wind energy is one of the best alternative for power generation. Recently, vertical axis wind turbine (VAWT) received renewed interest as small-scale wind energy converter due to its suitability for urban application, where the wind condition is known to be unsteady and turbulence. Amongst various type of VAWTs, H-type Darrieus rotor has become more popular, thanks to its simple construction features, resulting to low manufacturing and installation cost. The aim of this paper is to evaluate numerically the power performance of straight-bladed Darrieus VAWT with different turbine solidity using computational fluid dynamic (CFD) technology. A series of two-dimensional CFD simulations of a three-bladed H-type Darrieus rotor were performed with 3 different solidities, σ (0.3, 0.5 and 0.7) to evaluate their power performance. Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations were used to calculate the instantaneous moment coefficient, Cm and power coefficient, Cp over a range of tip speed ratio, λ (0.5–4.5) with a free stream velocity of 8.0 m/s. The simulation results show that high solidity turbine performed well at low values of λ while turbine with low solidity has a wider operating range of λ and performed better at λ > 3.0 due to less blade-wake interactions between upstream and downstream halves of the turbine and lower blockage effect. The findings lend substantially to our understanding of physics flow around blades and turbine in order to optimize the power performance of small scale straight-bladed Darrieus VAWT operating in unsteady and turbulence wind condition.

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Dabachi, Mohamed Amine, Abdellatif Rahmouni, Eugen Rusu, and Otmane Bouksour. "Aerodynamic Simulations for Floating Darrieus-Type Wind Turbines with Three-Stage Rotors." Inventions 5, no. 2 (2020): 18. http://dx.doi.org/10.3390/inventions5020018.

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Growing energy demand is causing a significant decrease in the world’s hydrocarbon stock in addition to the pollution of our ecosystem. Based on this observation, the search for alternative sorts of energy to fossil fuels is being increasingly explored and exploited. Wind energy is experiencing a very important development, and it offers a very profitable opportunity for exploitation since the wind is always available and inexhaustible. Several technical solutions exist to exploit wind energy, such as floating vertical axis wind turbines (F-VAWTs), which provide an attractive and cost-effective solution for exploiting higher resources of offshore wind in deep water areas. Recently, the use of the Darrieus vertical axis wind turbine (VAWT) offshore has attracted increased interest because it offers significant advantages over horizontal axis wind turbines (HAWTs). In this context, this article presents a new concept of floating Darrieus-type straight-bladed turbine with three-stage rotors. A double-multiple stream tube (DMST) model is used for aerodynamic simulations to examine several critical parameters, including, solidity turbine, number of blades, rotor radius, aspect ratio, wind velocity, and rotor height. This study also allows to identify a low solidity turbine (σ = 0.3), offering the best aerodynamic performance, while a two-bladed design is recommended. Moreover, the results also indicate the interest of a variable radius rotor, as well as the variation of the height as a function of the wind speed on the aerodynamic efficiency.

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Sulistyono, Sulistyono, Elka Faizal, and Alfi Tranggono Agus Salim. "Pengaruh Variasi Radius Sudu Turbin Angin Darrieus Tipe Sudu-J." Jurnal Energi dan Teknologi Manufaktur (JETM) 3, no. 02 (2020): 15–18. http://dx.doi.org/10.33795/jetm.v3i02.65.

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Utilization of alternative energy, therefore this wind turbine is used as an alternative energy power plant. So this experimental study is used to determine how much influence on the performance of the Darrieus type J-blade vertical shaft wind turbine by varying the blade radius. The method used is a true experimental research method. The independent variables in this study are variations in wind speed of 3, 4, 5, 6, and 7 m / s. The dependent variable in this research is shaft power and efficiency. Then the controlled variables in this study were the number of blades 3 and the front radius of the blade: 5, 10, and 15 mm. The test results and data processing shows that the blade radius of the Darrieus J-blade type of wind turbine affects the performance of the Darrieus J-blade type wind turbine. In testing the highest value was achieved at a blade radius of 15 mm with a wind speed of 7 m / s, namely the shaft power value of 0.323 Watt and the efficiency value of 4.673%.

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Torabi Asr, Mahdi, Reza Osloob, and Faizal Mustapha. "Double-Stage H-Darrieus Wind Turbine - Rotor Aerodynamics." Applied Mechanics and Materials 829 (March 2016): 21–26. http://dx.doi.org/10.4028/www.scientific.net/amm.829.21.

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H-Darrieus wind turbines, due to their simple design and relatively low manufacturing costs have recently received much attention particularly for standalone applications. However start-up issues associated with their operation restricted their operation in areas of low average wind speed and encourages engineers to develop novel design. Several design proposed in this way but in most cases design came up with complex sensing mechanisms and mechanical actuators or high cost manufacturing parts. A recent rotor design called double Darrieus rotor proposed as a German patent case bridged these complexities appropriately. The aim of present study is to investigate this innovative design from aerodynamic point of view by means of validated CFD techniques. A flow-driven simulation setup based on 6DOF calculations employed in order to study rotor operation from stand still until peak performance obtained. Results from these precise modeling reveal the superiority of the proposed double-stage design in compare with the original H-Darrieus rotors in terms of start-up behavior and optimum performance.

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Mohan Kumar, Palanisamy, Krishnamoorthi Sivalingam, Teik-Cheng Lim, Seeram Ramakrishna, and He Wei. "Review on the Evolution of Darrieus Vertical Axis Wind Turbine: Large Wind Turbines." Clean Technologies 1, no. 1 (2019): 205–23. http://dx.doi.org/10.3390/cleantechnol1010014.

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The objective of the current review is to present the development of a large vertical axis wind turbine (VAWT) since its naissance to its current applications. The turbines are critically reviewed in terms of performance, blade configuration, tower design, and mode of failure. The early VAWTs mostly failed due to metal fatigue since the composites were not developed. Revisiting those configurations could yield insight into the future development of VAWT. The challenges faced by horizontal axis wind turbine (HAWT), especially in the megawatt capacity, renewed interest in large scale VAWT. VAWT provides a solution for some of the immediate challenges faced by HAWT in the offshore environment in terms of reliability, maintenance, and cost. The current rate of research and development on VAWT could lead to potential and economical alternatives for HAWT. The current summary on VAWT is envisioned to be an information hub about the growth of the Darrieus turbine from the kW capacity to megawatt scale.

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OMATA, Shinya, and Yoshiaki TAMURA. "1931 Fluid Analysis around Darrieus Wind Turbine." Proceedings of Conference of Kanto Branch 2012.18 (2012): 607–8. http://dx.doi.org/10.1299/jsmekanto.2012.18.607.

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Srinivasan, C., G. Ajithkumar, S. Arul, G. Arulprasath, and T. M. Dharunbabu. "Design of Combined Savonius-Darrieus Wind Turbine." IOSR Journal of Mechanical and Civil Engineering 14, no. 02 (2017): 60–70. http://dx.doi.org/10.9790/1684-1402056070.

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Mohammed, Gwani, Mamuda Buhari, Umar Muhammed Kangiwa, and John Danyaro. "Design, Fabrication and Performance Evaluation of Hybrid Vertical Axis Wind Turbine." International Journal for Modern Trends in Science and Technology 6, no. 6 (2020): 80–86. http://dx.doi.org/10.46501/ijmtst060618.

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Vertical axis wind turbines (VAWT) have attracted a lot of attention recently as an efficient tool in harnessing wind energy; however these types of wind turbine are faced with some challenges which affect their overall performance. The Darrieus rotor has difficulty to self-start by itself while the Savonius rotor has low efficiency. The performance of these turbines can be improved by combining the two VAWTs as one system. This paper presents the design of a hybrid VAWTs turbine. The Hybrid VAWTs combines the Darrieus rotor and the Savonius rotor as a single system to produce a high starting torque and enhanced efficiency. The Savonius rotor is placed at the centre of the three vertical blades of the Darrieus H-rotor to form the hybrid VAWTs. The hybrid VAWT was tested at four different wind speed i.e. V = 4.80 m/s, 4.50 m/s, 4.30 m/s and 3.90 m/s respectively. The performance of the hybrid VAWT was compared with the conventional straight bladed VAWT under similar experimental conditions. The obtained results showed that there is substantial improvement in the self-starting ability and coefficient of power (Cp). At V = 4.80 m/s, the Cp values for hybrid VAWT increased by 92% compared to straight bladed H-rotor VAWT. Similar improvement was also observed at wind speed of V = 4.50 m/s, 4.30 m/s, and 3.90 m/s where the Cp values increases by 71%, 10%, and 67% respectively compared to the straight bladed H-rotor.

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Victor, Samson, and Marius Paraschivoiu. "Performance of a Darrieus turbine on the roof of a building." Transactions of the Canadian Society for Mechanical Engineering 42, no. 4 (2018): 341–49. http://dx.doi.org/10.1139/tcsme-2017-0096.

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Various efforts have been made to introduce micro wind turbines in urban areas. Their onsite wind generation can be beneficial, but general rules about their ideal placement in terms of energy extraction need to be identified. This paper investigates the performance of a Darrieus turbine when installed on the roof of a building and offers a rare analysis of the synergy between the turbine and the building. This study focuses on computational fluid dynamic (CFD) analysis of a vertical-axis wind turbine mounted on the upstream edge of a building. The CFD methodology is validated by comparing the calculated performance with experimental data. Three different turbine positions at different heights are investigated to capture the Cp–λ curve sensitivity. Positions 1 and 2 are at the edge of the building, whereas position 3 is a few meters away from the edge, directed towards the geometric center of the building. To simulate realistic atmospheric wind conditions, an atmospheric boundary layer is imposed at the inlet. The results show that the power coefficient is higher compared with a standalone turbine and that the location of the turbine on the building clearly affects the value of the tip-speed ratio at maximum power coefficient.

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Yershin, Sh A., A. K. Yershina, R. K. Manatbayev, and A. K. Tulepbergenov. "Definition of aerodynamic characteristics wind turbine to Darrieus of system troposcino." International Journal of Mathematics and Physics 7, no. 1 (2016): 99–106. http://dx.doi.org/10.26577/2218-7987-2016-7-1-99-106.

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Mei, Yi, and Jian Jun Qu. "Aerodynamic Performance Evaluation with a New Method for Darrieus Wind Turbine." Advanced Materials Research 1014 (July 2014): 115–19. http://dx.doi.org/10.4028/www.scientific.net/amr.1014.115.

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The operation condition for darrieus wind turbine is usually complex in urban sites. One of characteristics is unsteady tip speed ratios during the rotor operating, which makes the widely used aerodynamic performance indicator, maximum power coefficient, not so suitable for evaluating vertical axis rotor performance. In this paper, a new method based on the power coefficient values under variable tip speed ratios was developed and the mathematical expression derived by numerical integration measure was presented. Furthermore, a novel wind turbine power performance indicator, average effective wind energy utilization coefficient, has been defined for the rotor performance assessment. A wind tunnel case of darrieus wind turbine with different blade cord length was selected for analyzing. Results demonstrate the proposed method is correct and practical.

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Obretenov, Valentin, and Rossen Tliev. "A Study of a Darrieus Vertical Axis Wind Turbine with a guiding nozzle." E3S Web of Conferences 207 (2020): 02011. http://dx.doi.org/10.1051/e3sconf/202020702011.

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This paper presents the results from an experimental study of a Vertical Axis Wind turbine model with a guiding nozzle. The geometry of the nozzle is synthesized by an original methodology. The performance characteristics of the turbine are investigated when changing the number of the blades and their pitch angle. The obtained results allow us to generate generalized characteristics that can be used in the design of new turbines of this type. The results of the pilot studies showing higher efficiency than the classical Darrieus wind turbines (up to 50 % which is close to the Betz limit).

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Bianchini, Alessandro, Giovanni Ferrara, Lorenzo Ferrari, and Sandro Magnani. "An Improved Model for the Performance Estimation of an H-Darrieus Wind Turbine in Skewed Flow." Wind Engineering 36, no. 6 (2012): 667–86. http://dx.doi.org/10.1260/0309-524x.36.6.667.

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Small turbines are considered one of the most promising technologies for an effective diffusion of renewable energy sources in new installation contexts with a high degree of integration with human activity (e.g. the urban environment). In these new installations, however, the real working conditions can be far from the nominal ones. In particular, the turbine functioning can be noticeably affected by misalignments between the oncoming flow and the axis of the rotor; differently from horizontal-axis wind turbines, whose performance is decreased by a skew angle, H-Darrieus turbines are thought to take advantage from this condition in some cases. In this study, an improved model for the performance prediction of H-Darrieus rotors under skewed flow was developed. In detail, a theoretical approach based on Momentum Models was properly modified to account for the variations induced by the new direction of the flow which invests the rotor. In particular, the modifications in the aerodynamic characteristics of the airfoils, the swept area and the streamtubes distribution were modeled. The performance predictions of the new model were compared both with experimental data available in the technical literature and with the results of wind tunnel tests purposefully carried out on a full scale model of an H-Darrieus turbine. Notable agreement has been constantly obtained between simulations and experiments.

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Chen, Jing Ru, Zhen Zhou Zhao, and Tao Li. "Characteristic Analysis of Three-Bladed Darrieus Wind Turbine Based on the Multiple Streamtube Model." Applied Mechanics and Materials 651-653 (September 2014): 663–67. http://dx.doi.org/10.4028/www.scientific.net/amm.651-653.663.

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The paper analyzes the effect of airfoil thickness, camber and blade pitch angle on the performance of the three-bladed Darrieus wind turbines. The research results show that the increase of airfoil thickness, camber and pitch angle of blade, can improve power coefficient when the wind turbine tip speed ratio between zero and four. The increase of thickness and camber of the airfoil leads to running tip speed ratio range of wind turbine get narrowed, and reduces the power coefficient when wind turbine runs in high tip speed ratio range. When the pitch angle of blade is 1˚, power coefficient reaches the maximum value. Negative pitch angle has a bad impact on power coefficient and even creates negative power coefficients.

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Chougule, P. D., S. R. K. Nielsen, and Biswajit Basu. "Active Blade Pitch Control for Straight Bladed Darrieus Vertical Axis Wind Turbine of New Design." Key Engineering Materials 569-570 (July 2013): 668–75. http://dx.doi.org/10.4028/www.scientific.net/kem.569-570.668.

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As Development of smallvertical axis wind turbines (VAWT) for urban use is becoming an interestingtopic both within industry and academia. However, there are few new designs ofvertical axis turbines which are customized for building integration. These aregetting importance because they operate at low rotational speed producing veryless noise during operation, although these are less efficient than HorizontalAxis Wind Turbines (HAWT). The efficiency of a VAWT has been significantlyimproved by H-Darrieus VAWT design based on double airfoil technology asdemonstrated by the authors in a previous publication. Further, it is well knowthat the variation of the blade pitch angle during the rotation improves thepower efficiency. A blade pitch variation is implemented by active blade pitchcontrol, which operates as per wind speed and position of the blade withrespect to the rotor. A double multiple stream tube method is used to determinethe performance of the H-Darrieus VAWT. The power coefficient is compared withthat of a fixed pitch and a variable pitch double airfoil blade VAWT. It isdemonstrated that an improvement in power coefficient by 20% is achieved andthe turbine could start at low wind speed

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Kim, S. R., J. Shin, and E. S. Kim. "BASICS STUDY ON THE H-DARRIEUS WIND TURBINE." Journal of Computational Fluids Engineering 24, no. 3 (2019): 1–7. http://dx.doi.org/10.6112/kscfe.2019.24.3.001.

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Jin, Xin, Gaoyuan Zhao, KeJun Gao, and Wenbin Ju. "Darrieus vertical axis wind turbine: Basic research methods." Renewable and Sustainable Energy Reviews 42 (February 2015): 212–25. http://dx.doi.org/10.1016/j.rser.2014.10.021.

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NISHIZAWA, Yoshifumi, Yasuyuki NEMOTO, Yukihiro MAEZAWA, and Izumi USHIYAMA. "A Study on Helix-Darrieus Type Wind Turbine." Proceedings of the JSME annual meeting 2003.2 (2003): 59–60. http://dx.doi.org/10.1299/jsmemecjo.2003.2.0_59.

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Paraschivoiu, I., O. Trifu, and F. Saeed. "H-Darrieus Wind Turbine with Blade Pitch Control." International Journal of Rotating Machinery 2009 (2009): 1–7. http://dx.doi.org/10.1155/2009/505343.

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A procedure for computing the optimal variation of the blades' pitch angle of an H-Darrieus wind turbine that maximizes its torque at given operational conditions is proposed and presented along with the results obtained on a 7 kW prototype. The CARDAAV code, based on the “Double-Multiple Streamtube” model developed by the first author, is used to determine the performances of the straight-bladed vertical axis wind turbine. This was coupled with a genetic algorithm optimizer. The azimuthal variation of the blades' pitch angle is modeled with an analytical function whose coefficients are used as variables in the optimization process. Two types of variations were considered for the pitch angle: a simple sinusoidal one and one which is more general, relating closely the blades' pitch to the local flow conditions along their circular path. A gain of almost 30% in the annual energy production was obtained with the polynomial optimal pitch control.

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Wasiati, S. W., F. A. Augusta, V. R. P. Purwanto, P. Wulandari, and A. Syahrirar. "Darrieus type vertical axis wind turbine (VAWT) design." Journal of Physics: Conference Series 1517 (April 2020): 012064. http://dx.doi.org/10.1088/1742-6596/1517/1/012064.

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Paraschivoiu, Ion, Philippe Fraunie, and Claude Beguier. "Streamtube expansion effects on the Darrieus wind turbine." Journal of Propulsion and Power 1, no. 2 (1985): 150–55. http://dx.doi.org/10.2514/3.22773.

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Parra, Teresa, Carmen Vega, A. Gallegos, N. C. Uzarraga, and F. Castro. "Design of h-Darrieus vertical axis wind turbine." EPJ Web of Conferences 92 (2015): 02058. http://dx.doi.org/10.1051/epjconf/20159202058.

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Dosaev, M. Z., L. A. Klimina, B. Ya Lokshin, Yu D. Selyutskiy, and E. S. Shalimova. "AUTOROTATION MODES OF DOUBLE-ROTOR DARRIEUS WIND TURBINE." Mechanics of Solids 56, no. 2 (2021): 250–62. http://dx.doi.org/10.3103/s0025654421020060.

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Khammas, Farhan Ahmed, Kadhim Hussein Suffer, Ryspek Usubamatov, and Mohmmad Taufiq Mustaffa. "Overview of Vertical Axis Wind Turbine (VAWT) is one of the Wind Energy Application." Applied Mechanics and Materials 793 (September 2015): 388–92. http://dx.doi.org/10.4028/www.scientific.net/amm.793.388.

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This paper reviews the available types of wind turbine which is one of the wind energy applications. The authors intend to give investors a better idea of which turbine is suitable for a particular setting and to provide a new outlook on vertical axis wind turbines. Wind technology has grown substantially since its original use as a method to grind grains and will only continue to grow. Vertical-axis wind turbines are more compact and suitable for residential and commercial areas while horizontal-axis wind turbines are more suitable for wind farms in rural areas or offshore. However, technological advances in vertical axis wind turbines that are able to generate more energy with a smaller footprint are now challenging the traditional use of horizontal wind turbines in wind farms. Vertical axis wind turbines do not need to be oriented to the wind direction and offer direct rotary output to a ground-level load, making them particularly suitable for water pumping, heating, purification and aeration, as well as stand-alone electricity generation. The use of high efficiency Darrieus turbines for such applications is virtually prohibited by their inherent inability to self-start.

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Kumar, Palanisamy Mohan, Krishnamoorthi Sivalingam, Srikanth Narasimalu, Teik-Cheng Lim, Seeram Ramakrishna, and He Wei. "A Review on the Evolution of Darrieus Vertical Axis Wind Turbine: Small Wind Turbines." Journal of Power and Energy Engineering 07, no. 04 (2019): 27–44. http://dx.doi.org/10.4236/jpee.2019.74002.

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Cevasco, D., M. Collu, CM Rizzo, and M. Hall. "On mooring line tension and fatigue prediction for offshore vertical axis wind turbines: A comparison of lumped mass and quasi-static approaches." Wind Engineering 42, no. 2 (2018): 97–107. http://dx.doi.org/10.1177/0309524x18756962.

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Despite several potential advantages, relatively few studies and design support tools have been developed for floating vertical axis wind turbines. Due to the substantial aerodynamics differences, the analyses of vertical axis wind turbine on floating structures cannot be easily extended from what have been already done for horizontal axis wind turbines. Therefore, the main aim of the present work is to compare the dynamic response of the floating offshore wind turbine system adopting two different mooring dynamics approaches. Two versions of the in-house aero-hydro-mooring coupled model of dynamics for floating vertical axis wind turbine (FloVAWT) have been used, employing a mooring quasi-static model, which solves the equations using an energetic approach, and a modified version of floating vertical axis wind turbine, which instead couples with the lumped mass mooring line model MoorDyn. The results, in terms of mooring line tension, fatigue and response in frequency have been obtained and analysed, based on a 5 MW Darrieus type rotor supported by the OC4-DeepCwind semisubmersible.

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Journal articles on the topic 'Darrieus wind turbine'

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