叶片鸟撞击的理论和实验研究

本文对叶片受鸟撞击损伤的机理进行了理论和实验研究。开发了鸟撞击过程数值分析和叶片响应数值计算的软件系统 ,建立了鸟撞击模拟试验设备 ,进行了平板叶片的软体撞击试验。通过高速摄影 ,记录了叶片受软体撞击后的变形过程 ,为进一步研究叶片鸟撞击损伤问题打下基础。

ANALYTICAL AND EXPERIMENTAL INVESTIGATION OF BIRD IMPACT ON BLADES

Investigation on blade damage by bird impact is of great importance in the development of modern aero engines.The high speed dynamics of the bird impact on blades has been studied analytically and experimentally.The response analysis of the bird impact on the blade is a geometrical and material non linear,transient large displacement problem.A program system for the non linear transient response analysis has been developed and the loading characteristics of the bird impact are outlined.Based on the sensibility analysis of structural response to loading,a simple effective loading model of the bird impact is presented.A computer program of model analysis for the bird impact on blades is developed.The calculational results show that the bird impact on the blade at the velocity about 200m/s can be characterized as compressible fluid.The normal impact experiments with artificial birds have been completed,and the course of the bird impact was recorded by the high speed photography.It is proved again that the bird colliding against the blade behaves like compressible fluid.