Numerical simulation of ejector process within turbine-based combined-cycle engine

Based on CFD technology, and numerical solution of Navier-Stokes equation, the effects of aerodynamic and geometrical parameters on the TBCC ejector process were analyzed. The numerical solution results show that entering angle of the major airflow and the ejector length have important influence on airflow mixing process in ejector. With the entering angle of major airflow increasing, the total pressure and Mach number tend to be distributed uniformly. But the total pressure loss increases gradually. Therefore, in the design process of TBCC engine, the exhaust angle of turbine engine is not immoderately big. At the same time, the computed results show that the total pressure loss increases with increasing length. However, once the length is above the minimum length, the total pressure loss is not obvious when the length increased. So, for practical integration of TBCC propulsion system components, matching aerodynamic and geometrical parameters is important.