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Thermal Performance and Flow Visualization of a Planar Heat-Pipe Leading Edge

机译：平面热管前端的热性能和流动可视化

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摘要

The sharp leading edges of a hypersonic vehicle are promising for the enhancement of its aerodynamic performance. However, they need a cooling mechanism because they are exposed to extremely high heat flux during reentry or hypersonic cruise, which easily heats up the surface materials beyond their temperature limits. This study explores the concept of a leading edge with planar heat-pipe cooling for which the whole inner surfaces are directly covered with a capillary wick. Its isothermal characteristic and simple configuration can provide robustness; however, due to the uniqueness of the planar type, the thermofluid characteristics should be investigated. Therefore, two kinds of heating tests (the inside visualization test and high-temperature test) were conducted using water as a working fluid. The gravity effects were surveyed, changing the test article attitude. The results showed that the planar concept worked as expected; no large temperature distribution was observed along both the chord and span directions, even in a nose-up attitude or a top heat configuration; the heat transfer performance was improved in nose-down attitude. During the heat-pipe operation, a heat transfer coefficient approximately 100 times higher than that of an evacuated operation was obtained. Visualizing inside the test article revealed that the screen mesh wick was properly covered with condensed water and that typical bubble formations of nucleate boiling were observed around the tip in some cases.
机译：高超音速飞行器的锋利前缘有望增强其空气动力学性能。但是，它们需要一种冷却机制，因为它们在折返或超音速巡航期间会暴露于极高的热通量之下，这很容易将表面材料加热到超过其温度极限的水平。这项研究探索了采用平面热管冷却的前缘的概念，该前缘的整个内表面都直接由毛细管芯覆盖。它的等温特性和简单的配置可以提供鲁棒性；但是，由于平面型的独特性，应该研究热流体特性。因此，使用水作为工作流体进行了两种加热测试（内部可视化测试和高温测试）。对重力效应进行了测量，从而改变了测试物品的姿态。结果表明，平面概念按预期工作。沿鼻翼和跨度方向均未观察到较大的温度分布，即使在鼻翼向上姿势或顶部加热状态下也是如此；鼻垂姿势改善了传热性能。在热管操作期间，获得的热传递系数比抽空操作的传热系数高大约100倍。可视化测试物品内部显示筛网芯被适当的冷凝水覆盖，并且在某些情况下，在尖端周围观察到典型的核沸腾气泡形成。

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  • 来源
    《Journal of Spacecraft and Rockets》 |2019年第3期|771-779|共9页
  • 作者

    Kinefuchi Kiyoshi; Tamba Jun; Saito Ikuhiko;

  • 作者单位

    Japan Aerosp Explorat Agcy, Res & Dev Directorate, Tsukuba, Ibaraki 3058505, Japan;

    Natl Inst Adv Ind Sci & Technol, Natl Metrol Inst Japan, Tsukuba, Ibaraki 3058560, Japan;

    Natl Inst Adv Ind Sci & Technol, Natl Metrol Inst Japan, Tsukuba, Ibaraki 3058560, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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