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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Study on helium impingement cooling for a sharp leading edge subject to aerodynamic heating
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Study on helium impingement cooling for a sharp leading edge subject to aerodynamic heating

机译：气动加热对锋利前缘氦气冲击冷却的研究

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This paper presents numerical studies on a typical actively-cooled thermal protection system (TPS) which turns out to be a potential candidate for the leading edge thermal management. The leading edge is cooled by the impingement jet of gaseous helium. The external aerodynamic heating and radiation, the heat conduction in solid wall, and the internal impingement cooling are coupled in a unified computational fluid dynamics system by using a quasi-coupling method. The thermal-hydraulic performance of internal impingement cooling is particularly highlighted. Four metal alloys are tested in order to find out the impact of the material property on the TPS's cooling performance. Results show that the reduction of leading edge temperature is remarkable with the impingement cooling scheme and the maximum temperature can be controlled far below the materials' melting point. However, the thermal stress does not significant decrease and is still a barrier for the application of the actively-cooled TPS. The operation limits of various materials are demonstrated, which may benefit to the future material selection work. Besides, the coolant flow rate requirements for safely operating the TPS under various flight conditions are ascertained. (C) 2016 Elsevier Ltd. All rights reserved.
机译：本文对典型的主动冷却式热保护系统（TPS）进行了数值研究，结果证明它是前沿热管理的潜在候选者。前缘由气态氦的撞击射流冷却。外部空气动力和辐射，固体壁中的热传导以及内部撞击冷却通过准耦合方法耦合到统一的计算流体动力学系统中。内部冲击冷却的热工液压性能尤为突出。测试了四种金属合金，以找出材料性能对TPS冷却性能的影响。结果表明，采用冲击冷却方案降低了前沿温度，并且可以将最高温度控制在远低于材料的熔点的水平。但是，热应力不会显着降低，仍然是应用主动冷却TPS的障碍。说明了各种材料的操作限制，这可能会有利于将来的材料选择工作。此外，确定了在各种飞行条件下安全运行TPS的冷却剂流速要求。 （C）2016 Elsevier Ltd.保留所有权利。

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