| Citation: | SUN Ruibin. Study on similarity parameters of divert-jet interaction in supersonic and hypersonic flows[J]. Journal of Aerospace Power, 2025, 40（9）：20250070 doi: 10.13224/j.cnki.jasp.20250070
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Considering the issue of divert-jet interaction in supersonic and hypersonic cone-cylinder-flare interceptor missiles, a numerical solution of the three-dimensional Navier-Stokes equations was employed to analyze the reasons for the differences between cold and hot jet interaction. A study on similarity parameters was conducted by combining flight conditions and wind tunnel experiment conditions, and similarity parameters suitable for simulating the force and moment of divert jet interaction were obtained. Research indicated that the differences in cold and hot jet interaction attributed to variations in mass/energy flow rates between cold and hot jets, differences in the geometric parameters of cold and hot nozzles, and the chemical reactions in the hot gas jet. Among these, the first two factors had a more significant impact on the interaction characteristics than the chemical reaction effects. Under the premise of neglecting chemical reaction effects, the force interaction factors and the shift amount of jet force center obtained through air jet simulations using equivalent total pressure ratio, momentum ratio, and total enthalpy ratio demonstrated good agreement with the combustion gas jet results across conditions of Mach number 3—8 at 20 km altitude and Mach number 7 at 20—40 km altitude. When employing air or helium jets matching total pressure ratio, momentum ratio, and total enthalpy ratio to simulate hot jet conditions in ground wind tunnel tests, the simulation errors for both force interaction factors and the shift amount of jet force center were significantly reduced compared with conventional cold jet simulation methods.
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