基于AUSM改进格式的超声速射流数值模拟

Numerical Simulation of Supersonic Jet Based on the Improved AUSM Scheme

采用改进的二阶AUSM格式方法对复杂燃气超声速射流进行了数值模拟。将改进的AUSM格式发展到守恒型的轴对称Euler方程组,对不同来流条件的燃气伴随射流进行数值计算。数值实验结果表明:该改进的方法能清晰捕捉复杂波系结构中的入射激波、λ激波、反射激波、接触间断等现象;流场特征与试验纹影图吻合很好,数值结果优于二阶TVD格式计算值;该改进的方法有很高分辨率,能较好抑制伪振荡和红宝石现象;为超声速射流的数值研究提供了一种新方法。

The complicated supersonic jet varying with coming stream conditions were simulated numerically using the improved second-order AUSM schemes,which was developed to solve the conservative axisymmetric Euler equations based on two-dimensional laws.The numerical results show that the improved method can capture the wave structures of supersonic jet flow fields including incident shock,λshock,reflected shock,constant discontinuity.The numerical results are consistent with experimental data,and the numerical results are better than the results computed by the second-order TVD scheme;Neither nonphysical oscillation nor carbuncle phenomenon occurs near the discontinuous point,which indicates that the improved method has high capacity.The improved method offers a new method to study the supersonic flow.