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The ine uence of different injector geometries on the mixing behavior of planar supersonic jets is investigated. Hydrogenisinjectedinthee owdirectionthroughthebluntendofastrut.Differentlipthicknessesattheinjectorend induce different extents of recirculation zones. Additionally, changes are caused within the shock-wave/expansion fan pattern at the injector exit that have an important ine uence on loss in total pressure. The accuracy of the used numerical scheme is demonstrated for one injector geometry by comparison with experimental data. Based on this cone guration, modie cations in lip thickness and injection Mach number are investigated numerically and are assessed using several calculated performance parameters. Results show that the chosen lip thickness has a much stronger ine uence on loss in total pressure than moderate modie cations in injector length and height. For the very thin hydrogen jets that were investigated, the mixing efe ciency is nearly independent on injector lip thickness.
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Gerlinger et al. (2000) studied this question.
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