Abstract A quantified parametric study for the heat transfer acting on a hypersonic blunt body with counterflowing jets is presented. Three-dimensional turbulent Navier-Stokes equations are solved to simulate freestream-jet interactive flowfields. The freestream and jet controlling parameters are treated as input sources of variation, and a point-collocation non-intrusive polynomial chaos (NIPC) method is utilized to quantify the variations in the output surface heat flux and total surface heat load acting on the blunt body by identifying the maximum and minimum of surrogate response values predicted by the NIPC. All of the sample cases are confirmed to form steady jet structures. Furthermore, through a global sensitivity analysis, Sobol indices evaluated by the NIPC, are used to rank the contributions of each input parameter to the variation in output quantities of interest. It is found that the designed upstream injection of baseline case effectively reduces the heat transfer to body surface compared with the no-jet case. The variations of input parameters induce remarkable variations of output heat flux and total heat load. The sensitivity analysis indicates that the jet-to-freestream total-pressure ratio is the top contributor to variations in heat flux, followed by the freestream Mach number. The jet total temperature is mainly important on the front part of forebody, while the contributions of jet Mach number and freestream temperature slightly increase downstream. The freestream density has the smallest effect. The sensitivity of total heat load to input parameters coincides with that of heat flux. This parametric study is expected to illustrate the significance of flow-controlling parameters to the heat transfer over blunt body and provide insight for aerothermal management by using counterflowing jets in hypersonic flows.

中文翻译：

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高超声速流动中具有逆流射流的钝体传热参数研究

摘要 介绍了作用在具有逆流射流的高超声速钝体上的传热的量化参数研究。求解三维湍流 Navier-Stokes 方程以模拟自由流-射流交互流场。自由流和射流控制参数被视为变化的输入源，并利用点配置非侵入多项式混沌（NIPC）方法来量化作用在钝体上的输出表面热通量和总表面热负荷的变化通过确定 NIPC 预测的最大和最小替代响应值。确认所有样例均形成稳定的射流结构。此外，通过全球敏感性分析，由 NIPC 评估的 Sobol 指数，用于对每个输入参数对感兴趣的输出量变化的贡献进行排序。结果表明，与无喷射情况相比，基线情况下设计的上游喷射有效地减少了向体表的传热。输入参数的变化引起输出热通量和总热负荷的显着变化。敏感性分析表明，射流与自由流总压比是热通量变化的最大贡献者，其次是自由流马赫数。射流总温度主要集中在前体前部，而射流马赫数和自由流温度的贡献在下游略有增加。自由流密度的影响最小。总热负荷对输入参数的敏感性与热通量的敏感性一致。