常压下超音速等离子体射流的数值模拟

NUMERICAL SIMULATION OF SUPERSONIC PLASMA JET UNDER NORMAL PRESSURE

数值模拟研究了在二维轴对称情形下,超音速等离子体射流喷射于常压环境中的湍流流动,其中考虑了等离子体物性随温度的大幅度变化,还考虑了粘性耗散。等离子体射流的数学模型采用了Navier-Stockes方程,对湍流的模拟采用了ek-方程。计算方法以SIMPLER方法为基础,引入密度修正,得到适用于可压缩流体的p方程和p方程。p方程用来更新现有压力场和密度场,p方程用来修正速度场以保证质量守恒。

In this paper, two-dimensional (axial symmetry) supersonic plasma jets are studied by numerical simulation. The work is for the case of turbulent flow on the hypothesis of LTE (Local Thermodynamic Equilibrium), and temperature-dependent plasma properties and viscous dissipation are involved. The Naveir-Stocks equation is adopted as governing equation of plasma jets and ek-equation for turbulent. The simulation method is based on SIMPLER algorithm. By incorporating density correction into the continuity equation, two new pressure correction, P equation and Pequations are obtained for compressible flow. P equation is used to update the existing pressure and density fields, and the P equation is used to correct the velocity field to ensure continuity of mass. These results are expected to be useful in further study of supersonic plasma jet under normal pressure.