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Flow, Turbulence and Combustion

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01-08-2023 | Research

Savonius Wind Turbine Performance Comparison with One and Two Porous Deflectors: A CFD Study

Authors: Md. Mahmud Hasan Saikot, Mahfuzur Rahman, Md. Anwar Hosen, Wasif Ajwad, Md. Faiyaz Jamil, Md. Quamrul Islam

Published in: Flow, Turbulence and Combustion | Issue 4/2023

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Abstract

The present study explores the effect of using two porous deflectors on the performance of the Savonius wind turbine compared to only one porous deflector. The numerical simulation is performed to solve the unsteady Navier–Stokes equations using the SST k-ω turbulence model. The porous deflectors under consideration are placed upstream of a Savonius wind turbine. To improve turbine performance, deflector parameters such as porosity, angle, position, and length are varied for one of the deflectors placed near the advancing blade. The second deflector in front of the returning blade is retained in a previously optimized configuration. Then the finalized configuration with two porous deflectors is compared to the previous single porous deflector configuration. At a tip speed ratio of 0.9, the finalized two porous deflector configuration exhibits a 26% higher power coefficient than the single porous deflector case and delivers positive torque throughout the cycle. The maximum variation of torque coefficient in a cycle is found to be 6% lower as well. Due to the increased blockage effect for two deflectors, suitable domain dimensions are also studied to mitigate the overestimation of the performance coefficient. The self-starting capability of the turbine is improved significantly for the azimuthal angle of 80° as well.

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Title: Savonius Wind Turbine Performance Comparison with One and Two Porous Deflectors: A CFD Study
Authors: Md. Mahmud Hasan Saikot
Mahfuzur Rahman
Md. Anwar Hosen
Wasif Ajwad
Md. Faiyaz Jamil
Md. Quamrul Islam
Publication date: 01-08-2023
Publisher: Springer Netherlands
Published in: Flow, Turbulence and Combustion / Issue 4/2023
Print ISSN: 1386-6184
Electronic ISSN: 1573-1987
DOI: https://doi.org/10.1007/s10494-023-00459-6

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