摘要
采用液态水作为冷却工质,通过烧结成型方式将钛铝合金材料制备为多孔介质平板,通过高压气瓶提供压力驱动水从多孔介质材料渗出,利用石英灯辐照的方式进行了500 k W/m^2热流密度的热考核,并监测了试验过程中的温度和流量力变化。试验结果表明:在中等热流下,利用水的相变发汗冷却能够进行有效防热,材料加热面温度始终接近于水的沸点。且在试验过程中监测到,在给定水的增压压力情况下,随着时间推移,水的汽化过程逐渐深入多孔介质内,使得水流量逐渐升高。
In this paper,the cooling performance using liquid water as the phase-changed coolant is studied. An alloy of titanium and aluminium is sintered into porous material,and heated up under quartz lamps with a heat flux of 500 k W /m^2,the time-varied data of temperature and molar flux are collected during the experiment. The result shows that the phasechanged transpiration cooling has a high performance in medium heat flux,and the wall temperature under quartz lamps is undulating upon the boiling point of water. At the same time,the water flux increases since the start of the experiment because of the gradual penetrating process of the phase-changing interface inside the porous material.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2017年第2期212-218,共7页
Journal of Astronautics
基金
国家自然科学基金(11372054)
关键词
主动热防护
发汗冷却
相变
多孔介质
石英灯
Active thermal protection
Transpiration cooling
Phase change
Porous material
Quartz lamps
