An experimental investigation on transpiration cooling with phase change under supersonic condition
An experimental investigation on transpiration cooling with phase change under supersonic condition
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超声速条件下相变蒸腾冷却的实验研究
DOI：
10.1016/j.applthermaleng.2016.03.039
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发表时间：
2016-07-25
影响因子：
6.4
通讯作者：
Chen, Lianzhong
中科院分区：
文献类型：
--
作者：
Shen, Lin;Wang, Jianhua;Chen, Lianzhong
高超声速飞行器的极高热载荷对研究和开发更有效的热防护技术提出了巨大的挑战。液体发汗冷却是一种很有前途的热塑性技术，因为液体的相变可以释放大量的潜热。在中国航天空气动力技术研究院电弧加热风洞中，以水为工质，进行了发汗冷却实验研究，实验条件为：自由流比焓2700 kJ/kg，质量流量645 g/s，马赫数4.2。在这个实验中使用的样本，鼻锥，由两种类型的材料。一种是在前缘区域烧结多孔材料作为发汗冷却基体，另一种是带有氧化锆热障涂层（TBC）的非渗透性合金。通过冷却剂流量定量注入器控制冷却剂室的热力学和气动参数，防止过冷和烧蚀现象。表面温度分布由红外热成像系统（ITIS）捕获。本文展示和分析了一些有趣的实验现象，包括高焓环境下的结冰，由于TBC的热平衡滞后，表面冷却效率的变化。介绍了一种估算水质量流量的数值方法，并结合实验结果分析了其相对误差。(C)2016爱思唯尔有限公司版权所有
The extremely high heat loads on hypersonic vehicles make great challenges for the research and development of more effective Thermal Protection Technique (TPT). Transpiration cooling using liquid coolant has been confirmed as a promising TPT, because the phase change of liquid can release a large amount of latent heat. An experimental investigation on transpiration cooling using water as coolant was conducted in the arc-heated wind tunnel of China Academy of Aerospace Aerodynamics (CAAA), with a free stream specific enthalpy, mass flow rate and Mach number of 2700 kJ/kg, 645 g/s and 4.2, respectively. The specimen used in this experiment, a nose cone, consists of two types of materials. One is sintered porous material in the leading edge region as transpiration cooling matrix, and the other is impermeable alloy with zirconia Thermal Barrier Coating (TBC). The thermodynamic and aerodynamic parameters in coolant chamber are controlled by a quantitative injector of coolant mass flow rate to prevent the phenomena of overcooling and ablation. Surface temperature distributions are captured by an infrared thermal imaging system (ITIS). This paper exhibits and analyzes some interesting experimental phenomena, including ice formation in high enthalpy environment, hysteresis of thermal balance due to TBC, and variations of surface cooling effectiveness. A numerical approach to estimate the water mass flow rate is introduced and the relative error referenced experimental results is analyzed. (C) 2016 Elsevier Ltd. All rights reserved.