摘要
本文提出了确定颤振叶片动应力的数值方法，包括叶片振动时非定常气动力作功与阻尼功的计算，平衡振幅的概念。
A numerical method is presented to determine the dynamic stresses and fatigue life of a flutter blade in turbomachinery.The method contains the calculation of unsteady aerodynamic work and damping work of the vibrating blades;the conception of equilibrium amplitude;and the estimation of its fatigue life in accordance with the dynamic stresses of the vibrating blades under the equilibrium amplitude.The unsteady aerodynamic work is obtained from the calculation of 3-D unsteady N-S equations with the Oscillating Fluid Mechanics Method (OFMM) and the Parametric Polynomial Method(PPM).The maximum kinetic energy and dynamic stresses of the vibrating blades are calculated with FEM.The fatigue life of the blade is estimated with Manson-Coffin Equation.The calculated results demonstrate that the blades can operate even the unsteady aerodynamic work is positive.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
1998年第4期431-434,共4页
Journal of Aerospace Power
关键词
叶片
疲劳寿命
颤振
动应力
航空发动机
Blades Fatigue life Flutter Dynamic stress Numerical analysis
