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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >Supercritical nitrogen free jet investigated by spontaneous Raman scattering
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Supercritical nitrogen free jet investigated by spontaneous Raman scattering

机译：自发拉曼散射研究超临界无氮射流

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摘要

The injection of fuel and oxidizer in high pressure rocket combustion chambers is simulated in a model experiment dedicated to investigate the phenomenology of coaxial injection at supercritical pressures. Cryogenic nitrogen is injected in a pressurized reservoir of N_2 at ambient temperature at 4 MPa and 6 MPa, above the critical pressure for nitrogen of 3.4 MPa. The radial density distribution of the N_2 is determined by spontaneous Raman-scattering, from the measured densities temperature distributions are derived. The radial density and temperature profiles are analyzed as a function of the distance from the injector for x/D = 1 to 30. The influence of density gradients, internal field effects and interference effects on the performance of the Raman technique when applied to turbulent high density flows is discussed.
机译：在模型实验中模拟了高压火箭燃烧室中燃料和氧化剂的喷射，该模型实验致力于研究超临界压力下同轴喷射的现象。在高于氮气的临界压力3.4 MPa的环境温度下，在4 MPa和6 MPa的环境下，将N 2加压的氮气注入低温氮气中。通过自发的拉曼散射确定N_2的径向密度分布，从测量的密度得出温度分布。当x / D = 1到30时，径向密度和温度曲线将作为距喷油嘴距离的函数进行分析。当应用于湍流高压时，密度梯度，内部场效应和干涉效应对拉曼技术性能的影响讨论了密度流。

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