Abstract
Wind energy generation in adverse conditions has always been a challenge for the energy industry, especially at low wind speeds. Vertical axis wind turbines (VAWT) are promising solutions for low and turbulent wind conditions; however, their low efficiency has been a problem for their application and requires further research initiatives. In this research, a multi-Savonius VAWT arrangement is tested to use an unnatural wind source, a cooling tower exhaust, to improve the turbine performance. The analysis method was done by a series of two-dimensional computational fluid dynamics (CFD) simulations using Ansys FLUENT. A grid sensitivity test was performed, and the numerical model was validated against published numerical and experimental results. Test cases with single and multi-turbine configurations at six different tip speed ratios were then performed to calculate the turbine performance. The multi-turbine configuration improved the power coefficient by up to 19.29%. The multi- turbine arrangement has proven to be an effective means of increasing the performance of the Savonius turbine for the exhaust energy recovery system.
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