压气机风扇叶片颤振预测和抑制的工程研究

Engineering research on prediction and suppression of blade flutter in compressor fan

通过能量法对某压气机风扇试验件叶片原型方案进行气弹稳定性预测,计算出该方案的颤振边界点.对其中气弹不稳定叶片的几何造型进行修改以提高气弹稳定性.通过原型和改型方案的叶片几何造型、气动性能、振动特性以及气弹稳定性的对比,从气动角度分析了压气机风扇叶片颤振的机理.获得了工程上抑制压气机风扇叶片颤振的有效手段,如增大叶片弦长、降低展弦比,增大叶片厚度、增强叶片刚性,减小攻角、改善流动状况.

The aeroelastic stability prediction and the flutter margin point were achieved by energy method in original scheme of prototype compressor fan blade.The geometric modeling of aeroelastic unstable blade was modified to improve the aeroelastic stability.By comparison of blade geometric modeling,aerodynamic performance,vibration characteristic and aeroelastic stability in original and modified schemes,the blade flutter mechanism of compressor fan was analyzed on aerodynamic aspect.The effective engineering flutter suppression means for the compressor fan blade are achieved,such as increasing the chord length of blade and decreasing the aspect ratio,increasing the blade thickness and stiffness,decreasing the angle of incidence and improving the flow.