不同形状砂尘高速冲蚀TC4平板的数值仿真

含有砂尘的空气吸入发动机，会与压气机转子叶片以较高的相对速度发生碰撞，产生砂尘冲蚀现象，严重影响到飞行器飞行安全。通过采用能较好适应大变形的光滑粒子流体动力学(SPH)方法和有限元(FE)耦合的方法，建立不同形状砂尘冲蚀TC4平板模型，研究TC4平板表面受砂尘高速冲蚀的典型损伤形式及其规律。结果表明:砂尘尖角越小，冲击产生的弹坑越深，所造成的损伤也越大；随砂尘逐颗撞击平板，弹坑的深度变化越来越小，表现为平板表面的塑性硬化过程；在砂尘连续冲击下，受到冲击角的影响，损伤处的堆积物可能被砂尘冲脱平板，也可能被重新压回弹坑。 

Numerical simulation of TC4 plates with high speed erosion of sand dust with different shapes

The air inhalation engine containing sand dust could collide with the compressor rotor blade at a higher relative speed and produce sand dust erosion, seriously affecting the flight safety of the aircraft. The model of TC4 plate with different shapes of sand dust was established by using the smoothed particle hydrodynamics (SPH) and finite element (FE) coupling, which could better adapt to the large deformation. The typical damage forms and laws of high speed erosion of the sand dust on the surface of the TC4 plate were studied. Results showed that the smaller sand dust angle meant the deeper impact crater and the greater damage. With the sand dust hitting the plate, the depth of the pit became smaller and smaller, showing the plastic hardening process of the flat surface; under the continuous impact of the sand dust, the impact angle was affected by the sand dust, the accumulation of the damage may be flushed off the plate by sand dust and repressed back to the crater.