高空高马赫数侧向喷流数值模拟

Numerical simulation of high Mach number side jet at high altitude

高空环境下,侧向喷流在飞行器的姿态转换及热防护方面起到关键作用,同时也由于来流稀薄,直接模拟蒙特卡洛方法(DSMC)对侧向喷流干扰流场的模拟具有很好的适用性。在非结构网格计算的DSMC数值算法的基础上,针对喷流的高密度区及激波区提出了一种自适应网格技术,可以用于对高空稀薄区的大气来流与侧向喷流的干扰流场进行模拟预测。通过模拟二维平板侧向喷流,对编制的算法可靠性进行验证,研究了时间步长对流场模拟结果的影响及其数值的选取原则,并模拟计算了不同喷流/来流压力比下的复杂干扰流场结构和气动力的变化规律。

In high altitude environment,lateral jet plays a key role in attitude conversion and thermal protection of aircraft.At the same time,due to the thin incoming flow,direct simulation Monte Carlo method(DSMC)has a good applicability for the simulation of lateral jet interference flow field.In this paper,based on the DSMC numerical algorithm of unstructured grid computing,an adaptive grid technique is proposed for the high density and shock region of jet flow.It can be used to simulate and predict the interference flow field of atmospheric incoming flow and lateral jet flow in the high thin region.By simulating two-dimensional lateral jet flow,the reliability of the proposed algorithm was verified.The influence of time step on the flow field simulation results and the selection principle of the numerical value were studied.The complex interference flow field structure and gas dynamics under different jet/inflow pressure ratios were simulated and calculated.