| 引用本文: | 刘洪鹏,刘伟强.飞行器层板式前缘热管防热结构等效热分析.[J].国防科技大学学报,2016,38(2):19-24.[点击复制] |
| LIU Hongpeng,LIU Weiqiang.Effective thermal analysis of platelet heat-pipe-cooled leading edge of vehicle[J].Journal of National University of Defense Technology,2016,38(2):19-24[点击复制] |
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| 飞行器层板式前缘热管防热结构等效热分析 |
| 刘洪鹏1,2, 刘伟强1,2 |
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(1.国防科技大学 航天科学与工程学院， 湖南 长沙 410073;2.
2.国防科技大学 高超声速冲压发动机技术重点实验室， 湖南 长沙 410073)
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| 摘要: |
| 针对高超声速飞行器前缘尖锐部件所面临的严重气动热，提出层板式前缘热管防热结构。为避免前缘热管内复杂的两相传热传质计算，对高温热管蒸汽腔的传热进行了等效导热分析，讨论了蒸汽腔的等效导热系数的计算方法，与常规高温热管试验对比验证了计算方法的准确性。对该结构热防护效果的计算表明，当飞行器在34 km高度以7Ma速度飞行时，以IN718为管壁材料、Na为工质的层板式热管对头部半径为15 mm的前缘结构具有良好的热防护效果。 |
| 关键词: 热防护 热管 层板 换热系数 |
| DOI：10.11887/j.cn.201602004 |
| 投稿日期：2015-10-22 |
| 基金项目:国家自然科学基金资助项目（90916018）；湖南省自然科学基金资助项目（13JJ2002） |
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| Effective thermal analysis of platelet heat-pipe-cooled leading edge of vehicle |
| LIU Hongpeng1,2, LIU Weiqiang1,2 |
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(1. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China;2.
2. Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China)
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| Abstract: |
| A new structure, the platelet heat pipe cooled leading edge, was proposed for hypersonic vehicle thermal protection. In order to avoid the challenge of modeling two-phase conjugate heat and mass transfer, an approach of modeling the vapor core as a solid thermal conductor with high conductivity was adopted and the effective vapor thermal conductivity was deduced mathematically. Its effectiveness was validated by comparing the wall temperature against experimental date for a conventional heat pipe. The research result indicates that the nickel based alloy IN718, with sodium as the working fluid, is a feasible combination form Mach 7 with a 15 mm leading edge radius. |
| Keywords: thermal protection heat pipe platelet thermal conductivity |
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