Numerical Analysis of the Effect of Different Entrance Lengths of the Flanged Shroud on the Power Performance of Savonius Rotor

Mohamed Fawzy Obiaa, Alsaied Mahmoud Khalil, Mohamed Mahgoub Bassuoni, Ahmed Mustafa Khaira

Abstract


In this study, the effect of the different entrance lengths (short, medium, and long) of the flanged shrouded Savonius rotor is investigated in three-dimension (3-D) numerically by ANSYS-FLUENT 2022 R1. The current numerical model of a simple rotor, which has an equal diameter and height of 300 mm, is validated with the previously published experimental results of the same rotor at the same operating condition (wind speed 6 m/s) and geometry. The validation is done by the several turbulence models which are recommended by the previous published numerical studies with different values of time step size and mesh size. The numerical and experimental power curves indicate good agreement with each other when using the SST K-? model with a time step size of 0.0025 s with an accuracy percentage around 96 % .The analysis of the numerical results of the three flanged shrouded models shows an enhancement of the torque coefficient at tip speed ratio 0.42 with a 40% increase and the power coefficient at tip speed ratio 0.5 with an 18% increase compared with the bare rotor at the same free stream velocity. However, the shroud is not effective on the performance of the rotor after a tip speed ratio of 0.7.

Keywords


Savonius; CFD; Shroud; Wind; VAWT

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References


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DOI (PDF): https://doi.org/10.20508/ijrer.v15i4.14936.g9138

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