采用流固耦合方法的直升机桨叶鸟撞数值模拟

在鸟撞直升机桨叶过程中，鸟体与桨叶撞击相对速度很大，呈现出流体特性，属于典型的流固耦合瞬态冲击动力学问题。首先针对文献中的鸟撞铝板试验采用ALE流固耦合方法进行了分析，对计算方法与鸟体模型进行了验证。然后进行了桨叶鸟撞数值模拟。数值模拟结果表明ALE 方法能够准确模拟鸟撞过程，适用于直升机桨叶鸟撞分析。通过应力、位移以及撞击压力等计算结果的详细分析，对直升机旋翼抗鸟撞设计具有一定的参考价值。

Numerical simulation of bird impact on the helicopter blade by fluid-structure coupling method

During the process of bird impact on helicopter blades, the relative speed is quite fast and the bird presents the fluid characteristic. So the impact between the bird and helicopter blade is a typical transient fluid-structure coupling dynamics. Firstly, to verify the calculation method and the bird model, the bird impact on aluminum plate test in the literature is analyzed by adopting ALE fluid-solid coupling method. Then numerical simulation of bird impact on the blades is conducted. The numerical simulation results show that the ALE method can accurately simulate and be applied to the process of bird impact on helicopter blade. The detailed analysis to the calculation result such as stress, displacement and impact pressure provides a reference to anti-bird impact on helicopter rotor design