Theoretical study on the prediction of the hydrodynamic performance of a Savonius turbine based on stagnation pressure and impulse momentum principle
2018
Patel, Vimal | Eldho, T.I. | Prabhu, S.V.
A theoretical study is introduced to predict the hydrodynamic performance of a vertical axis Savonius turbine with semicircular vanes. This theory is based on the concept of stagnation pressure rise at the turbine vanes and Newton’s second law of impulse momentum principle. The present theory predicts the performance of a Savonius rotor with semicircular vane including overlapping vanes. Although the present model is derived for semicircular vanes, it can also be used for any type of the vanes with minor modifications.For the validation of an investigated theory, the results obtained by the presented theory is compared with the experimental results available in the published literatures. The comparison of the results are done for two major cases of the Savonius turbine, i. Turbine with an end plate and ii. Turbine without end plates for low aspect ratio. The calculation shows that, the theoretically calculated results predicts the maximum power within 3.6% and maximum coefficient of power within 6.67% variation.It can be conclude that the present theory will be most useful to decide the best design configurations of Savonius turbine unit for specific available flow conditions and quick performance prediction of a Savonius turbine for different operating conditions.
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