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High-enthalpy shock/boundary layer interaction on a double wedge.

机译：双楔上的高焓冲击/边界层相互作用。

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Experiments were performed in the T5 Hypervelocity Shock Tunnel to investigate nonequilibrium real-gas effects on separation length and reattachment heating using a double-wedge geometry and nitrogen test gas. Local external flow conditions were estimated by computational reconstruction of the inviscid nonequilibrium flow field. Application of results from triple-deck theory to a simple model for separation led to a new scaling parameter which approximately accounts for the effects of wall temperature on separation length for a laminar nonreacting boundary layer and extends previous results to arbitrary viscosity law. A classification was introduced which divides mechanisms for real-gas effects into mechanisms acting internal and external to viscous regions of the flow, with internal mechanisms further subdivided into those arising upstream and downstream of separation. Application of the ideal dissociating gas model to a scaling law for separation length, based on local external flow parameters and a nonreacting boundary layer, showed that external mechanisms due to dissociation decrease separation length at low incidence but depend on the free-stream dissociation at high incidence, and have only a small effect on reattachment heating. A limited numerical study of reacting boundary layers showed that internal mechanisms due to recombination occurring in the boundary layer upstream of separation cause a slight decrease in separation length and a large increase in heat flux relative to a nonreacting boundary layer with the same external conditions. Correlations were presented of experimentally measured separation length using local external flow parameters computed for reacting flow, which scales out external mechanisms but not internal mechanisms. These showed the importance of the new scaling parameter in high-enthalpy flows, a linear relationship between separation length and reattachment pressure ratio as found previously for supersonic interactions, and a Reynolds-number effect for transitional interactions. A significant increase in scaled separation length was observed for high-enthalpy data in the laminar regime, and this was attributed to an internal recombination mechanism arising in the free-shear layer downstream of separation. Experimental data for reattachment heating agreed roughly with existing correlations and exhibited an increase due to an internal recombination mechanism, but could not provide further insight due to large scatter.
机译：在T5超高速冲击隧道中进行了实验，研究了使用双楔形几何结构和氮气测试气体对分离长度和重新连接加热的非平衡真实气体影响。通过无形非平衡流场的计算重建来估计局部外部流动条件。将三层理论的结果应用到一个简单的分离模型中后，得出了一个新的缩放参数，该参数大致考虑了壁温度对层状非反应性边界层分离长度的影响，并将先前的结果扩展至任意粘度定律。引入了一个分类，该分类将实际气体作用的机理分为作用于流体粘性区域内部和外部的机理，内部机理又细分为在分离的上游和下游产生的机理。基于局部外部流动参数和非反应边界层，将理想离解气体模型应用于分离长度的比例定律，结果表明，由于离解，外部机理降低了低入射时的分离长度，但取决于高离合时的自由流离解发生率，对重新连接加热只有很小的影响。有限的反应边界层数值研究表明，与在相同外部条件下未反应的边界层相比，在分离上游的边界层中发生的重组引起的内部机理会导致分离长度的略微减小和热通量的大幅增加。提出了使用为反应流计算的局部外部流量参数实验测量的分离长度的相关性，该参数可扩展外部机制但不扩大内部机制。这些证明了新的比例参数在高焓流中的重要性，分离长度与重新附着压力比之间的线性关系（如先前对于超音速相互作用所发现的）以及雷诺数效应对于过渡相互作用的重要性。对于层流状态下的高焓数据，观察到按比例缩放的分离长度显着增加，这归因于在分离下游的自由剪切层中产生的内部重组机制。重新附着加热的实验数据大致与现有的相关性一致，并且由于内部重组机制而呈现出增加的趋势，但由于分散较大，无法提供进一步的见解。

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