叶轮机械叶片颤振的影响参数

采用基于能量法的流固耦合数值预测方法对比研究了几个主要参数对叶轮机械叶片气动弹性稳定性的影响规律,并较深入地阐述了叶片颤振发作机理.以某型发动机第一级压气机叶片为例,在叶片的不同模态下,通过给定不同的进出口边界条件分别研究了叶片模态和叶间相位角对叶轮机械气动弹性稳定性的影响,并从叶片吸力面激波以及波后分离区共同作用的角度解释了叶轮机械叶片的颤振发作机理.计算结果表明:叶片模态和叶间相位角对叶轮机械叶片的颤振有关键性的影响,而吸力面激波以及波后分离区是导致叶片颤振发作的重要因素. 

Effects of parameters on blade flutter in turbomachinery

An aeroelastic stability prediction approach derived from energy method developed in reference 1] has been used to investigate the effects of several parameters on the aeroelastic stability of rotor blades in turbomachinery, and the mechanism of flutter has been determined in some details. Taken the first stage compressor rotor of an engine as an example, the aeroelastic analysis has been computed under different working conditions for the oscillating cascades with different blade modes. Some parameters, such as mode shape and interblade phase angle (IBPA), are included to investigate their effects on the flutter in turbomachinery. And the flutter mechanisms are also concluded from the interaction of shock wave on the suction surface and separation area behind shock. The result shows that mode shape and IBPA are the key parameters affecting the flutter characteristics, while the shock wave on the suction surface and the separation area behind the shock wave are the important factors to induce the blade flutter.