平面叶栅内固体粒子运动特性的研究

A STUDY ON MOTION BEHAVIOURS OF PARTICLES THROUGH TURBINE CASCADE

在利用高速摄影技术获得固体粒子在平面叶栅内运动特性的基础上，采用Ｌａｇｒａｎｇｉａｎ轨迹法分别在考虑与不考虑边界层影响的情况下，计算了固体粒子在叶栅内的运动轨迹和速度。通过与实验结果的比较发现：在利用Ｌａｇｒａｎｇｉａｎ法计算固体粒子的运动特性时，对于尺寸比较大的粒子可以不考虑边界层的影响，而对于尺寸比较小的粒子则需考虑边界层的影响。

A high speed camera is used to photograph the motion process of particles through turbine cascade.The effects of particle size and initial position on the particle trajectories and velocities are analyzed.The particle trajectories and velocities are also computed with the Lagrangian method under conditions of flow with and without boundary layer.Comparison between computational and experimental results shows that it is necessary to consider the effect of the boundary layer for the smaller particles,but it is unnecessary for the larger particles when the Lagrangian method is used to compute the motion behaviours of particles.