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采用非定常数值仿真方法研究了进气道自起动过程中流动的非定常特性,分析了内压段构型对非定常流动特性的影响。研究结果表明:进气道自起动过程中流动特性受内压段构型与来流条件影响。内压段压缩面肩部曲率半径越大,内压段面积收缩越缓,越易出现流场振荡现象,流场振荡越剧烈;型面设计参数β≤33°,能够避免流场振荡现象出现。合理设计进气道内压段型面能够控制自起动过程中流动的非定常特性。自起动过程中,流场出现振荡时随着来流马赫数增大流动依次经历不振荡状态→振荡状态→不振荡状态→起动状态,且流场振荡频率逐渐下降;对于未发生流场振荡的进气道,随着来流马赫数增大进气道依次经历硬不起动状态→软不起动状态→起动状态。
The unsteady numerical simulation is used to study the unsteady behavior of the inlet flow during the self-starting process. The influence of the configuration of the internal pressure section on the unsteady flow characteristics is analyzed. The results show that the flow characteristics during the self-starting process are affected by the configuration of the internal pressure section and the flow conditions. The larger the radius of curvature of the compression surface of the internal pressure section, the more the area of the internal pressure section shrinks more and the more easily the phenomenon of flow field oscillation occurs, and the more severe the flow field oscillation is; the design parameter of the surface section β≤33 ° can avoid the phenomenon of flow field oscillation . Reasonable design of the inlet section inner pressure section can control the unsteady characteristics of the flow during the starting process. During the starting process, the flow field oscillates with the Mach number of the incoming flow and then goes through the non-oscillating state → the oscillating state → the non-oscillating state → the starting state, and the oscillation frequency of the flow field gradually decreases; and for the flow field not oscillating Intake airway, as the incoming Mach number increases, the intake air sequentially undergoes a hard non-start state → a soft non-start state → a start-up state.