基于AUSM改进格式的超声速射流数值模拟

摘要

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 j et 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 j et 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.