Tow testing of Savonius wind turbine above a bluff body complemented by CFD simulation

Goh, Seach Chyr; Boopathy, Sethu; Krishnaswami, C.; Schlüter, Jörg

doi:10.1016/j.renene.2015.10.015

Cited by 39 publications

(14 citation statements)

References 7 publications

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“…Savonius is one of the simplest types of VAWTs, with its rotor consisting of several semi-circular blades. It is a drag type turbine, and compared with other VAWTs, its performance peaks at relatively lower TSRs [10]. This turbine is distinctively attributed with decent self-starting characteristics as a consequence of the large static torque it generates, and this is one of its main traits which attracts researchers [11].…”

Section: Of 21mentioning

confidence: 99%

A Dynamic Rotor Vertical-Axis Wind Turbine with a Blade Transitioning Capability

2019

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This work presents an optimized design of a dynamic rotor vertical-axis wind turbine (DR VAWT) which maximizes the operational tip-speed ratio (TSR) range and the average power coefficient (Cp) value while maintaining a low cut-in wind velocity. The DR VAWT is capable of mimicking a Savonius rotor during the start-up phase and transitioning into a Darrieus one with increasing rotor radius at higher TSRs. The design exploits the fact that with increasing rotor radius, the TSR value increases, where the peak power coefficient is attained. A 2.5D improved delayed detached eddy simulation (IDDES) approach was adopted in order to optimize the dynamic rotor design, where results showed that the generated blades’ trajectories can be readily replicated by simple mechanisms in reality. A thorough sensitivity analysis was conducted on the generated optimized blades’ trajectories, where results showed that they were insensitive to values of the Reynolds number. The performance of the DR VAWT turbine with its blades following different trajectories was contrasted with the optimized turbine, where the influence of the blade pitch angle was highlighted. Moreover, a cross comparison between the performance of the proposed design and that of the hybrid Savonius–Darrieus one found in the literature was carefully made. Finally, the effect of airfoil thickness on the performance of the optimized DR VAWT was thoroughly analyzed.

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Section: Of 21mentioning

confidence: 99%

A Dynamic Rotor Vertical-Axis Wind Turbine with a Blade Transitioning Capability

2019

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“…They investigated the impact of the rotor-nacelle interaction and their influence on the Un. Recently, Goh et al (2016) developed Uinf correlations to vertical axis wind turbine, similarly to horizontal axis wind turbines; the authors studied Savonius wind turbine performances by measuring wind speed above the wind turbine. They established the relationship between that position and Uinf using CFD simulations and compared the obtained results to their experimental measurements.…”

Section: Many Authors Have Analyzed and Developed Nacelle Anemometry mentioning

confidence: 99%

Effect of Grid Topology on Numerical Simulations of Flow Fields around Wind Turbine Nacelle Anemometer

Tata¹,

Smaili²,

Masson³

2018

JAFM

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In this paper, the effect of mesh topology on the numerical predictions of the immediate near wake region of a horizontal axis wind turbine is investigated. The present work focuses on the nacelle anemometry measurements. Steady Reynolds Averaged Navier-Stokes (RANS) equations are applied to describe the airflow around the wind turbine nacelle. The k-ε turbulence model is used. To model the turbine rotor, the approach based on the actuator disc concept is considered. The computational domain has been meshed with five different configurations of grid; namely, quasi-structured, unstructured and three different hybrid grids constituted of blending of quasi-structured and unstructured grids. The obtained results are compared to the available experimental data. The hybrid mesh with quasi-structured grid in the boundary layer region and unstructured grid in the vicinity of the nacelle is found to be more promising to simulate the near wake generated downstream of the wind turbine nacelle and to predict accurately the nacelle anemometry measurements.

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“…& Senthilvel Santhakumar senthilvel@rvsgroup.com through the SWT shaft. The drag-based vertical axis wind turbines are most suitable for highways applications because of the better torque generation capabilities in low wind speeds [1]. Hence the vertical axis SWT is selected for this highway wind power generation.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on the rotational behaviour of a Savonius wind turbine for two-lane highway applications

Santhakumar¹,

Palanivel

Venkatasubramanian³

2018

J Braz. Soc. Mech. Sci. Eng.

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The objective of this work is to understand the behaviour of a Savonius wind turbine (SWT) on two-lane highways located in Coimbatore district, India. Experiments were conducted by placing a Savonius wind turbine (SWT) on the sides of the highway during the southwest monsoon season in three different directional roads, i.e., southwest to northeast , south to north and west to east. Vehicles moving on the highway at varying speeds modify the velocity of air locally, which in turn results in varying the drag forces on the blades of SWT, setting it in motion. An economical SWT was designed, fabricated and tested in a wind tunnel and on the highways, and the angular rotational speeds were measured. Based on the data obtained, further analysis was done to understand the behavioural patterns of SWT. Data obtained from the experiments show a ''negative drag force'', which is created in two-way lanes by the vehicles moving in opposite direction, affecting the rotational speed of SWT by a significant proportion. These conditions have been studied and the results have been discussed.

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Tow testing of Savonius wind turbine above a bluff body complemented by CFD simulation

Cited by 39 publications

References 7 publications

A Dynamic Rotor Vertical-Axis Wind Turbine with a Blade Transitioning Capability

A Dynamic Rotor Vertical-Axis Wind Turbine with a Blade Transitioning Capability

Effect of Grid Topology on Numerical Simulations of Flow Fields around Wind Turbine Nacelle Anemometer

An experimental study on the rotational behaviour of a Savonius wind turbine for two-lane highway applications

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