喷射系统的流场数值仿真

Fluid Field Numerical Simulation of the Jet System

本文采用N—S流体力学方程描述喷射系统内部流体运动的状况,用罚函数有限元法进行数值仿真,得到速度矢量及流线分布图,模拟流体运动的规律。文中依据Prandtl理论导出半空间自由射流速度反射流束宽度算式,通过实验修正自由射流的宽度。

The fluid motion inter a jet system is described by the Navier-Stokes fluid mechanics equations and is simulated with the penalty finite element method in this paper. The velocity vectors and stream function curves are obtained for simulation purpose. According to the Prandtl theory, the authors also have developed the free jet velocity and the bunch width in a half space, and the latter is amended by the experiment. The results of this paper are applied to the ejector of rocket motor.