摘要
提出了一种计算氧碘化学激光器化学非平衡流动的解耦方法。求解二维可压缩非定常N-S方程及组分连续方程,计算氧碘化学激光器中的组分混合反应流场。空间离散格式为AUSM+up格式,用四步龙格-库塔方法作显式时间推进。假设混合气体为热力学完全而热值非完全气体,化学反应模型采用有限速率反应模型。使用一种"点隐式"方法来处理化学源项的刚性问题。计算结果表明本文方法可以有效解决计算中的刚性问题,与现有隐式算法相比减少了大量的矩阵运算,公式推导简单,易于实现和改进。
An uncoupled method was introduced to simulate numerically nonequilibrium flow which had the stiffness problem. Mixing reaction flows in COIL are simulated by solving the Reynolds averaged Navier-Stokes equations and species continuity equations. Equations are solved using four-stage Runge-Kutta time-stepping scheme on structured viscous mesh. The simulations are carried out with AUSM ＋ up scheme. The method employs finite-rate chemistry and thermodynamic perfect gas properties for chemical reaction. The stiffness problem of chemical source is overcome by a semi-implicit method. The COIL numerical results are in good agreement with the results of AeroSoft＇s GASP^[s].
出处
《空气动力学学报》
CSCD
北大核心
2008年第2期227-230,共4页
Acta Aerodynamica Sinica
基金
教育部高等学校优秀青年教师教学科研奖励计划资助
关键词
氧碘化学激光器
化学非平衡流动
解耦方法
COIL（ chemical oxygen iodine laser）
nonequilibrium flow
uncoupled method.
