关键词: 复合式发动机;引射模态;性能分析

Abstract: Applying 3-D turbulent finite volume numerical algorithm validated, different operation status of Rocket Based Combined Cycle (RBCC) model with different structures and working conditions of primary rocket were simulated in ejector mode. It was found that: 1, by increasing the chamber pressure of the primary rocket, the second air mass flow rate, the total thrust of the model and the mixing efficiency will increase. 2, the shape of primary rocket nozzle can affect the ejector-mixing efficiency dramatically. However, with the promise of providing enough primary mass flow, cone-shaped primary nozzle can be utilized in the rectangular main duct of RBCC model, which will not bring obvious reduction to the system performance. 3, by increasing primary nozzle number, the mixing quality will improve. 4, the expansion half-angle of primary nozzle can not change the second mass flow rate. But can affect the mixing efficiency and thrust of primary rocket. 5, the change of area expansion ratio of the primary nozzle will not effect second mass flow rate. But it will change the mixing efficiency.

Key words: Compound engine;Ejector mode;Performance analysis