外物撞击航空发动机转子叶片速度估算

以飞机进气道为参照系，利用动量定理推导了外物在飞机进气道内运动的速度方程；以叶片为参照系，建立了外物撞击速度及撞击角度的表达式。为直观显示不同因素对速度变化的影响，以某型飞机及其发动机为例，研究了飞机离地时，发动机100%设计转速下，外物在飞机进气道内运动速度的变化规律。结果表明:影响运动速度的因素不仅包括外物的材质、形状、大小及姿态，而且涉及飞机进气道长度、发动机工作状态等；外物撞击方向与叶片表面不垂直。 

Estimation of velocity for foreign object that impacting rotor blade of aero engine

Taking the inlet port for a reference system, the velocity equation was developed using the momentum theorem to describe the motion of the foreign object from the inlet port to the rotor blade of aero engine. Correlations between impacting velocity and impacting direction were founded by taking the rotor blade as a reference system. A kind of airplane and its aero engine were taken as example, the change rule of the motion velocity in inlet channel was studied at aero engine 100% design speed when airplane took off the ground. It was found that the foreign object motion velocity related not only with the foreign object shape, dimension, location and material, but also with the aero engine working state and the length of the inlet port. The impacting direction was non vertical to the blade surface.