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.