| Citation: | LIU Jun, YUAN Huacheng, ZHANG Jinsheng, et al. Turbine-based combined-cycle inlet mode transition opertation conditions and transition schemes[J]. Journal of Aerospace Power, 2025, 40（8）：20230431 doi: 10.13224/j.cnki.jasp.20230431
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To achieve smooth mode transition of turbine-based combined-cycle (TBCC) propulsion system, the transition operation modes and transition schemes of TBCC inlet were investigated through wind tunnel test and numerical simulations. Three transition operation modes of TBCC inlet, including supersonic operation mode, supersonic/subsonic operation mode and subsonic mode, and the criteria for different operation modes were put forward. Then the operation zone, which included the three transition operation modes of inlet mode transition, was established according to the maximum backpressure of turbojet and ramjet flowpath at different modes. Two mode transition schemes were presented based on the operation zone. The results indicated that during TBCC inlet mode transition, the maximum backpressure of the turbojet flowpath of supersonic operation mode decreased from 32 times to 13 times, while it increased from 16 times to 32 times for the ramjet flowpath. The mass flow into two flowpath was changed linearly to the entrance area of turbojet/ramjet flowpaths during supersonic mode transition. Once the inlet operated in supersonic/subsonic mode during mode transition, aerodynamic coupling between two flowpath occurred. During mode transition from 40% to 60%, mass flow ratio of the turbojet flowpath decreased by 12% compared with supersonic operation mode and increased by 7% for the ramjet flowpath.
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