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为了研究高超声速进气道的脉冲起动特性,对二元高超声速进气道在脉冲风洞中流场建立过程进行了数值模拟,并根据运动激波关系式建立了双波结构数学模型,分析了进气道脉冲起动过程中双波结构的产生及传播过程。研究表明通过理论计算得到的双波结构气动参数与仿真结果基本一致。结合仿真发现进气道脉冲起动过程流场的主要特征包括:运动激波与斜激波相交、激波/边界层相互干扰以及分离包的空间位置和自身体积变化、进气道自起动过程等。另外结合双波结构计算模型,通过仿真研究了影响双波结构流动参数及影响进气道脉冲起动特性的因素,发现初始条件影响进气道的脉冲起动特性主要是通过改变双波结构的强度实现的。
In order to study the pulse starting characteristics of the hypersonic inlet, the numerical simulation of the flow field of the binary hypersonic inlet in a pulsating wind tunnel was established and the mathematical model of the double-wave structure was established according to the relation of the shock wave The formation and propagation of the double-wave structure in the process of inlet pulse start-up. The results show that the aerodynamic parameters of the double-wave structure obtained through theoretical calculation are basically consistent with the simulation results. The main characteristics of the flow field during the pulse start process are found in the simulation, including the intersection of the shock wave and the oblique shock wave, the mutual interference between the shock wave and the boundary layer, the change of the spatial position and the volume of the isolated packet, the self-starting process of the inlet pipe, etc. . In addition, combined with the calculation model of the double-wave structure, the factors that affect the flow parameters of the double-wave structure and the characteristics of the starting pulse of the inlet are studied by simulation. It is found that the pulse starting characteristics of the initial condition affect the inlet mainly by changing the strength of the double-wave structure of.