Experiments and numerical simulation of mixing under supercritical conditions
Experiments and numerical simulation of mixing under supercritical conditions
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超临界条件下混合实验与数值模拟
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
S. Candel
中科院分区：
文献类型：
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作者：
T. Schmitt;Jean‐baptiste Rodriguez;I. Leyva;S. Candel
超临界压力条件表示工作流体压力高于临界点的情况。在这些条件中，有趣的是识别跨临界范围，其对应于压力高于临界点但注射温度低于临界值的情况。这种情况特别令人感兴趣，因为它提出了在液体火箭发动机流动分析中具有技术相关性的基本问题。通过分析氮气剪切同轴射流的行为来设想这种情况，所述氮气剪切同轴射流包括在接近临界温度的温度下注入的内部流和在较高温度下的同轴流。实验进行了在没有外部调制和施加一个大振幅的横向声场。对选定的实验进行了真实的气体大涡模拟。采用实验和计算相结合的方法，对喷嘴几何形状和操作参数的影响进行了评价。
Supercritical pressure conditions designate a situation where the working fluid pressure is above the critical point. Among these conditions, it is interesting to identify a transcritical range which corresponds to cases where the pressure is above the critical point, but the injection temperature is below the critical value. This situation is of special interest because it raises fundamental issues which have technological relevance in the analysis of flows in liquid rocket engines. This situation is here envisaged by analyzing the behavior of a nitrogen shear coaxial jet comprising an inner stream injected at temperatures close to the critical temperature and a coaxial flow at a higher temperature. Experiments are carried out both in the absence of external modulation and by imposing a large amplitude transverse acoustic field. Real gas large eddy simulations are performed for selected experiments. The combination of experiments and calculations is used to evaluate effects of injector geometry and opera...