模态转换时间对模态转换过程的影响

Analysis of TBCC Dual Inlet Starting Characteristic During Mode Transition

利用动网格技术对外并联TBCC进气道在Ma2. 1定马赫数下的不同模态转换时间(50 ms,100 ms,1 s)的模态转换过程进行了非稳态数值模拟,得到了正向模态转换(涡轮通道由开到闭)和反向模态转换(涡轮通道由闭到开)中进气道冲压通道的起动特性以及起动状态与不起动状态的相互转换过程。结果表明:正向模态转换过程中,模态转换时间越短,冲压通道由起动状态变不起动状态时涡轮通道关闭越多;反向模态转换过程,模态转换时间越长,冲压通道越容易由不起动变起动。

Unsteady numerical simulation of the modal transition process of different modal switching times(50 ms,100 ms,1 s)of the external parallel TBCC inlets under Ma2.1 fixed Mach number was processed by using dynamic mesh technology,and the starting characteristics of the Ramjet channel and the transition between the starting state and the unstarting state were obtained in the forward mode transition(the turbine channel is from open to closed)and the reverse mode transition(the turbine channel is closed to open).The results show that during the forward mode transition,the shorter the modal transition time,the more the turbine channel is closed when the punching channel is changed from the starting state to the starting state.The reverse modal switching process,the longer the modal switching time,the easier the punching channel is changed from not starting to starting.