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为获得整体式固冲发动机转级过程中进气道堵盖(包括入口堵盖与出口堵盖)打开过程的流动形态,建立了进气道二维模型,利用Fluent动网格技术和UDF方法,开展了进气道堵盖打开过程非稳态流场研究。结果表明,在入口堵盖打开前,进气道前端形成强烈的弓形激波;在入口打开、出口未开的过程中,沿进气道轴向各监测点压强呈现周期性变化,振荡频率为100 Hz左右,出口堵盖位置压强振荡幅值为0.53 MPa;在出口打开后,补燃室残余热量形成的压强峰导致进气道在短时间内无法起动,随着背压降低至小于进气道再起动反压,进气道完全起动。
In order to obtain the flow pattern of the inlet blockage (including the inlet blockage and the outlet blockage) during the course of the integral solid-flushing engine being upgraded, a two-dimensional model of the intake port was established. By using Fluent dynamic meshing technique and UDF method , To carry out the study of unsteady flow field in the process of opening and closing of the inlet blockage. The results show that a strong bow shock is formed at the front end of the inlet before the inlet cover is opened. During the process of opening and opening of the inlet, the pressure at each monitoring point along the inlet port presents a periodic change with an oscillation frequency of 100 Hz or so, the amplitude of pressure oscillation at the outlet plugging position is 0.53 MPa. After the outlet is opened, the pressure peak formed by the residual heat of the afterburner causes the inlet port to fail to start within a short period of time. As the back pressure is reduced to less than the inlet pressure Road to start back pressure, inlet fully activated.