Study on the influence of blade profile on hydraulic Savonius turbine under wave action

• Published in: Ocean engineering Vol. 240; p. 109863
• Main Authors: Song, Ruiyin, Wu, Yeqing, Lin, Zuan, Ren, Congjie, Fang, Sheng
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.11.2021
• Subjects: Blade profile; Coefficient of power; Hydraulic Savonius turbine; Numerical simulation; Rotation speed; Coefficient of power; Rotation speed; Numerical simulation; Hydraulic Savonius turbine; Blade profile
• ISSN: 0029-8018; 1873-5258
• DOI: 10.1016/j.oceaneng.2021.109863

Hydraulic Savonius turbine plays an important role in wave power generation. In this study, several rotors with different profiles are proposed to improve the efficiency of wave capture. A two - dimensional finite element model of Savonius turbine is established by dynamic mesh technique. The speed and average power coefficient of different rotor profiles are analyzed by velocity and pressure nephogram. Finally, the numerical simulation results are verified by wave flume experiments. The result shows that as the waves gradually become larger, the rotation speed of the blades with different profiles will increase. In which, under the action of smooth wave, the rotation speed of all types of rotors is relatively stable. However, under the action of large waves, part of rotor types has a negative impact on the speed under the impact of the waves. In terms of average CP, as the wave becomes larger, the average CP of the rotor decreases instead. Compared with other types of rotors, the average CP of MB rotor is relatively stable under different working conditions. Its average CP reaches from 0.102 to 0.157. This type has a wide range of application and has practical value in the sea. •With the wave hight gradually become larger, the rotation speed of the blades with different profiles increase correspondingly. Several elliptic rotor profiles rotate at a faster speed at working condition 1, while MB type rotates faster at working condition 2 and 3. The maximum speed of MB rotor reaches 1.47 r/s.•Under working condition 1, the rotation speed of the rotors above is relatively stable. However, under working condition 3, which is under the action of large waves, part of rotor types has a negative impact on the speed under the impact of the waves.•The average CP is high when several elliptical types are in working condition 1, the average CP reaches from 0.169 to 0.192. Besides, by modifying the elliptical rotor profile, the improvement of the average CP is not greatly affected.•Wih increase of wave hight, the average CP of the rotor decreases instead.•The average CP of MB rotor is relatively stable under different working conditions. This type has a wide range of application and has practical value in actual marine enviroment.