发动机进气道水滴撞击特性分析

Analysis on Droplet Trajectories of an Engine Inlet

针对某发动机进气道的防冰系统设计 ,对进气道的水滴撞击特性进行了研究 .在对进气道流场进行计算的基础上 ,采用差分法对水滴运动方程进行了数值求解 ,得到了水滴运动轨迹 ,从而确定了水滴的撞击极限、总收集系数和局部水收集系数等水滴撞击特性参数 ;此外 ,还研究了飞行高度、飞行速度及水滴半径对水滴撞击特性的影响 ;研究发现水滴撞击极限、总收集系数和局部水收集系数随飞行速度的减小、飞行高度的增加或者水滴半径的增加而增大 .

Trajectories of water droplets were studied to provide information for anti-icing system design of inlet of an engine. Based on the calculation of flowfield around the inlet, numerical results of the motion equations for the droplets were presented by using difference method, and the droplet trajectories were obtained for a variety of flight conditions. Then, the impact range on the inlet surface, the total collection efficiency, and the local collection efficiency were determined. In addition, the effects of flight height, flight velocity, and radius of water droplet on droplet trajectories were also investigated. It is found that the impact range, the total collection efficiency and the local collection efficiency all increase with decreasing of flight velocity, increasing of droplet size or flight height. At the same time, the reasons of these results were analyzed.