脉冲式抽吸对进气道自起动特性影响研究

Research on the Effect of Pulse Suction on the Self-starting Characteristics of Inlets

基于带抽吸槽的二维混压式超声速进气道,开展了脉冲式抽吸对进气道自起动特性的影响研究。通过给定非定常边界条件,对飞行马赫数为2.2、抽吸背压脉动幅值为20000 Pa的进气道非定常流场进行了数值模拟。与定常条件下数值模拟结果进行对比,结果显示脉冲式抽吸能够改善进气道的自起动特性,且脉冲频率及波形均对自起动特性产生影响。

Based on a 2-D mixed-compression supersonic inlet with a suction slot, the effect of pulse suc- tion on the self-starting characteristics of inlets is studied. By the adoption of the given unsteady boundary conditions, the inlet unsteady oscillating flow fields are simulated, in which the suction baekpressure is oscillating with the amplitude of 20000Pa at Mach number 2.2. In comparison with the steady simulation results, it is showed that the pulse suction can improve the self-starting characteristics of inlets. The pulse frequency and waveform also can affect the performance.