1.Tongji University, Shanghai 200092, China;
2.college of civil and tramsportation, north china water conservancy and electric power institute, zhengzhou 450011,china
Abstract:The process of the vortex near the rear nozzle changing during the flutter of plate was tested by PIV technique. The relationship between model of periodic oscillation and Vortex evolution law was studied using the method of phase-average. When the wind speed below the critical flutter wind speed ,The state of structure motion was controlled by the vortex under the rear nozzle ,so the amplitude of structure was small, While the wind speed close to the critical flutter wind speed the scale of vortex up the rear wind lips significantly increased and matched to the down side vortex. The amplitude was also increased. The effect of Alternating vortex near the rear wind lips leaded to the vibration of model Until the structural divergence. The pressure of model surface was obtained by the method of CFD numerical simulation。The reasonable partition of the model surface was also made. The features of energy input during the flutter was researched by adopt of block analysis. The research showed that he model absorbing a lot of energy through the windward side nozzle from the air and in a complete vibration cycle, the energy input to the vibration of the system increased resulting in the sudden loss of structural stability.
刘祖军;;葛耀君; 杨詠昕 . 闭口单箱颤振的流场机理[J]. , 2012, 31(12): 22-27.
Liu Zu-jun; Ge Yao-jun; Yang Yong-xin . flow field mechanism of flutter of box section . , 2012, 31(12): 22-27.