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首页> 外文期刊>Aerospace science and technology >Numerical study on wall pressure over cone region of blunt-nosed body in high enthalpy shock tunnel HIEST
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Numerical study on wall pressure over cone region of blunt-nosed body in high enthalpy shock tunnel HIEST

机译：高焓激波隧道内钝头锥区锥壁压力的数值研究

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摘要

A cause of an overestimation of the computed surface pressure on a blunted cone in high-temperature hypersonic flow is explored. The overestimation was observed in a free-piston shock tunnel at the stagnation of H-0 = 15.6 and 10.1 MJ/kg. The sensitivity analysis reveals that a reduction of the upstream translational temperature in the range of 100 to 300 K substantially improves the agreement of the surface pressure with the measured data. As the cause of the lower upstream translational temperature, radiative cooling effect is included in the thermochemical nonequilibrium calculation in the nozzle, the translational temperature at the nozzle exit is reduced to about 250 K. Using the obtained flow variables as the upstream boundary condition, the computed pressure agrees quite well with the experimental data. In order to clarify whether other variables such as translational-vibrational relaxation time, chemical reaction rates, and upstream chemical composition could be the cause of the discrepancy, uncertainty quantification is employed. It is shown that these parameters of the thermochemical model and upstream chemical composition have minor effect on the agreement of surface pressure. It is concluded that the observed discrepancy in the surface pressure is due to radiative cooling effect of high temperature gas in the nozzle region. (C) 2015 Elsevier Masson SAS. All rights reserved.
机译：探究了高估超声速流中钝锥上计算出的表面压力的原因。在自由活塞冲击隧道中，在H-0 = 15.6和10.1 MJ / kg的停滞状态下观察到了高估。敏感性分析表明，将上游平移温度降低100至300 K可以显着改善表面压力与测量数据的一致性。由于上游平移温度降低的原因，辐射冷却效应包括在喷嘴的热化学非平衡计算中，喷嘴出口的平移温度降低到约250K。使用获得的流量变量作为上游边界条件，计算压力与实验数据非常吻合。为了阐明其他变量（例如平移振动弛豫时间，化学反应速率和上游化学成分）是否可能引起差异，使用了不确定性量化。结果表明，热化学模型的这些参数和上游化学成分对表面压力的一致性影响很小。结论是，观察到的表面压力差异是由于喷嘴区域中高温气体的辐射冷却效应所致。 （C）2015 Elsevier Masson SAS。版权所有。

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