We have used the software ANSYS-FLUENT to simulate the three-dimensional flow field in the combustion chamber of a scramjet engine, where the SST k-ω turbulent model and flamelet model have been implemented. The accuracy of numerical approach and simulation procedure has been verified against published cases, which is then applied to reform the scramjet combustion chamber. Specifically, By adding a porous burner behind the main combustion zone downstream the fuel injector, the performance is significantly improved, including flame stabilization and enhancement of kinetic energy and thrust. Variations of some key factors have also been considered, such as the drag and flame extinction. It is demonstrated by the simulation that the combustion chamber assisted by the porous cylinder could hold flames that would otherwise be quenched at extremely low mass flow rale of hydrogen as compared to the conventional one.
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