Direct Calculation of High-Speed Cavity Flows in a Scramjet Engine by the CESE Method

In this paper we report the application of the Space-Time CESE method to simulate supersonic flows over open cavities. In the setting of a dualmode scramjet engine, flow features of cavity flows with and without fuel injection are studied to understand flow features of mixing enhancement and flame holding. Without injection, our numerical results compared favorably with the experimental data for dominant frequencies and time-averaged pressure coefficients inside the cavities. With an upstream injection, the flow oscillations are drastically suppressed. The role of cavity-generated acoustic waves in fuel/air mixing enhancement is illustrated. The present results show that the CESE method provides high-fidelity numerical results of unsteady flows relevant to advanced scramjet engine concepts.

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