三叶片H型垂直轴风力机风振与减振研究

Wind Vibration and Vibration Reduction of a H-Rotor Type Three-Bladed Vertical Axis Wind Turbine

针对三叶片H型垂直轴风机风振与减振问题,基于计算流体动力学(CFD)方法,采用数值方法模拟获得风机在转动周期内的叶片风压分布.将风压力时程荷载施加于风力机叶片表面,分析风机结构风振响应.在风力机不同位置处分别布置阻尼器,并数值模拟阻尼器耗能减振能力.结果表明:在垂直轴风力机主轴与支杆连接处布置阻尼器可降低结构位移响应,总位移最大降幅达44%.阻尼器位置与结构位移降低率密切相关,在近风机叶片顶端连杆处布置阻尼器,结构最大位移发生在风机叶片底端.在近风机叶片底端连杆处布置阻尼器,最大位移则发生在风机叶片顶端,下降达40.7%.研究成果可为垂直轴风力机减振研究提供技术参考.

Aimed at the wind-induced response and vibration reduction of an H-rotor type three-bladed vertical axis wind turbine(VAWT),and based on computational fluid dynamics(CFD)method,a numerical simulation is conducted to obtain the blade wind pressure distribution during the rotation period.Then,the wind pressure obtained is applied to the surface of the blades to analyze the wind vibration response of the VAWT.Dampers are arranged at different positions of the VAWT to simulate the vibration reduction capacity.The results show that applying the damper at the connection between the main shaft and the support rod of VAWT could reduce the displacement response of the structure to a certain extent and the maximum drop would reach 44%.Furthermore,the displacement reduction rate of the structure is related to the position of the damper.If a damper is arranged near the top end of the blade,the maximum displacement of the structure would occur at the bottom of the blade.However,if a damper is arranged near the bottom end of the blade,the maximum displacement of the structure would occur at the top of the blade and the maximum drop would reach 40.7%.The results would provide technical reference for research on the vibration reduction of VAWT structures.