对一种外并联涡轮基组合循环发动机进气道进行了基于定常和非定常的模态转换过程气动特性分析,并研究了模态转换时间对进气道气动性能的影响。最终获取了进气道模态转换过程的流动特性,并分析了模态转换时间对外并联TBCC进气道的气动性能影响。结果表明:低速唇口旋转角度相同时,不同模态转换时间下的气动性能参数基本一致。 The aerodynamic characteristics of an external parallel turbine combined cycle engine intake were analyzed based on steady and unsteady modal transitions and the effect of modal transition time on the aerodynamic performance of the intake was investigated. Finally, the flow characteristics of the intake manifold modal transition process are obtained, and the influence of modal transition time on the aerodynamic performance of the parallel TBCC intake manifold is analyzed. The results show that the parameters of aerodynamic performance under different modal transition time are basically the same when the rotation angles of low-speed lip are the same.