| 确定颤振叶片动应力的数值方法 |
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| 引用本文： | 陈佐一,吴晓峰. 确定颤振叶片动应力的数值方法[J]. 航空动力学报, 1998, 13(4): 431-434,462 |
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| 作者姓名： | 陈佐一 吴晓峰 |
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| 作者单位： | 清华大学 |
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| 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，在平衡振幅条件下的动应力及其相应的寿命估价
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| 关 键 词： | 叶片 疲劳寿命 颤振 动应力 数值分析 |
| 收稿时间： | 1997-10-01 |
| 修稿时间： | 1998-01-01 |
NUMERICAL METHOD FOR DETERMINING DYNAMIC STRESSES IN FLUTTER BLADES |
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| Chen Zuoyi and Wu Xiaofeng. NUMERICAL METHOD FOR DETERMINING DYNAMIC STRESSES IN FLUTTER BLADES[J]. Journal of Aerospace Power, 1998, 13(4): 431-434,462 |
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| Authors: | Chen Zuoyi and Wu Xiaofeng |
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| Affiliation: | Dept.of Thermal Engineering,Tsinghua University,Beijing 100084 |
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| Abstract: | 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. |
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| Keywords: | Blades Fatigue life Flutter Dynamic stress Numerical analysis |
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