Optimum Design Configuration of Helical Savonius Rotor via Numerical Study

A helical Savonius rotor with two blades and 180 degree helical angle is researched to optimize the rotor power coefficient C_P via numerical study from different parameters like overlap ratio, diameter of endplates, and number of inner plates within buckets and aspects ratio. The results from the study show that the rotor gets better performances when overlap ratio equals to 0.19, or the diameter of end plates is around 10% more than that of the rotor rotation, or the number of inner plates is 6, or aspects ratio is 6.0. The maximum power coefficient C_Pmax of rotor reaches 0.21 when overlap ratio equals to 0.19, and the diameter of end plates is around 10% more than that of the rotor rotation, and the number of inner plates is 6, and aspects ratio is 6.0. The numerical study results coincide well with experimental results, that means the model results is credible.