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- W4387276522 abstract "A Savonius turbine can be highly effective for mountainous terrains and hydro channel applications with low flow speeds, owing to its low cut-in speeds, ease of maintenance, and self-starting nature. However, a challenge arises due to its low power output because of adverse torque produced by the returning blade. The present computational study aims to address this issue by considering a modified Bach rotor design with a varying overlap ratio at a high shape factor. Additionally, the axisymmetric omnidirectional deflector (AOD) for the Bach rotor is also studied. The tip speed ratio varies from 0.4 to 1.3. The results indicate that the maximum power coefficient of 0.249 is achieved for the Bach-AOD rotor at a tip speed ratio of 1.0. The overlap ratio of 0.2 shows negative gauge pressure in the overlap region, leading to the suction of flow onto the concave part of the returning blade. The AOD configuration enhances the positive gauge pressure area on the concave side of the advancing blade. By comparing conventional semicircular rotors with the present Bach-AOD rotor, a maximum increase of 42.68% in power coefficient at a tip speed ratio of 0.4 is observed. Both the Bach-AOD configuration and Bach rotor with an overlap ratio of 0.25 achieve a relatively constant power coefficient at a tip speed ratio larger than 0.6. The findings of the present study lead to a rotor design that maintains the same efficiency at variable wind speeds as long as it operates at the same rotational speeds." @default.
- W4387276522 created "2023-10-03" @default.
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- W4387276522 date "2023-12-01" @default.
- W4387276522 modified "2023-10-17" @default.
- W4387276522 title "Effects of axisymmetric-omnidirectional deflector on aerodynamics of modified Bach Savonius rotor for power enhancement" @default.
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- W4387276522 doi "https://doi.org/10.1016/j.enconman.2023.117720" @default.
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