Abstract
To improve the inlet performance of a ramjet working under variable conditions, a design is proposed by controlling the inlet with jet controlling, which combines the method of reducing the sealing Mach number of the external waves and the technique of controlling inlet by jet controlling. Three inlets were designed to analyze the feasibility and a numerical simulation method was used to simulate the three inlet flow fields. The adjustment mechanism of the design was studied through analysis of the simulation results. The design was verified by comparing the performances of the three inlets. The study showed that the method of reducing the sealing Mach number of the external wave system can improve the flow coefficient when the inlet works at low Mach numbers. The technique of controlling inlet by jet controlling can homogenize inlet flow fields at high Mach numbers, reduce effective throat area and increase the total pressure recovery (TPR). Adjustable inlets controlled by jet controlling demonstrate good performance at certain working ranges.
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