Mixing enhancement mechanism of combined H2–Water jets in supersonic crossflows in a combustor with an expanded section |
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Affiliation: | 1. Department of Aerospace Science and Technology, Space Engineering University, Beijing, 100048, China;2. Beijing Institute of Tracking and Telecommunications Technology, Beijing, 100094, China;3. State Key Laboratory of Technologies in Space Cryogenic Propellants, Beijing, 100028, China |
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Abstract: | To obtain the mixing enhancement mechanism of H2–Water combined jets in supersonic crossflows in a combustor with expanded section for rotating detonation ramjet, the flow field shape and spray structure were studied by experimental and numerical methods. The Eulerian–Lagrangian method was used to investigate the diffusion mechanism and H2–Water interaction law of combined jets with different sequences. At the same time, high-speed photography and the schlieren technique were used to capture the flow field. The effects of jet pressure drop, orifice diameter, orifice spacing, incoming Mach number, and other parameters on the penetration depth of water jets were studied. The results of experiment and simulation show that using H2–Water combined jets, the penetration depth of the jet spray can be greatly increased and the jet mixing effect can be significantly improved, which will contribute to the engine's ignition and stable combustion. In the case of pre-water/post-H2, the penetration depth of the hydrogen jet is greater. In the case of pre-H2/post-water, the hydrogen jet raises the water spray mainly by protecting the integrity of the water column. |
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Keywords: | Rotating detonation ramjet Combustor with an expanded section Supersonic crossflow Penetration depth |
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