气动激光器喷管非平衡流2维数值仿真

2D numerical simulation for non-equilibrium flow in gasdynamic laser nozzle

将Anderson的两振型三温度弛豫模型和严海星整理的弛豫数据相结合,采用2维守恒型方程组对按照最小长度喷管型面设计方法设计的、面积比分别为50和20的气动激光器喷管非平衡流场进行了数值仿真。小信号增益计算结果在每个计算点都和J.S.Vamos等人针对这两种喷管的小信号增益测量试验结果符合很好.解决了传统的准1维非平衡流分析方法不能很好地和试验结果相符的问题.对气动激光器喷管性能设计提供了更精确的评估方法。

Anderson＇s relaxation model of two modes and three vibrational temperatures was combined with Yan Haixing＇s vibrational relaxation data to simulate 2D non-equilibrium nozzle flows in a gasdynamic laser.Two different minimum-length nozzles with supersonic area ratios of 50∶1 and 20∶1 were studied by numerically solving the conservational equations.The small signal gains of the simulation results agree very well with J.S.Vamos＇s experiments for both nozzles.This analysis method solves the problem of matching the non-equilibrium nozzle flow analysis results of gasdynamic laser nozzles with the experimental data,which conventional quasi-one-dimensional simulation cannot do well.By this way,highly accurate method of evaluating a gasdynamic laser nozzle＇s performance was realized.