超声速底部喷流干扰流场数值模拟

数值模拟了不同马赫数,不同喷流压比下的轴对称超声速底部喷流干扰流场,采用LU隐式算法进行数值求解并引入了Baldwin-Lomax代数湍流模型.采用分区网格将弹身与底部区域合为一个整体进行计算,得到了清晰的流场结构和弹体表面及底部的压力分布,并与试验结果进行了比较.数值模拟结果表明超声速底部喷流干扰流场结构复杂,有、无喷流时底部流场有很大不同, 喷流对底压分布有明显影响,进而对轴向力系数影响显著.

Numerical investigation of base jet interaction in a supersonic external flow

Base flow and the supersonic external flow interaction with base jet are complicated They are associated with lots of questions in engineering and consequently considered of great aerodynamic problems. value in the flow mechanism of experiment. The flow structure of base region is very complicated and it is very difficult to predict accurately. Using Baldwin-Lomax turbulence model, the numerical results of base region are found to be closer to the experimental data for the case of no base jet than for the case of base jet. The under expanded supersonic jets have significant effects on the flow and axial force coefficients.