自由空间水/气垂直冲击冷却实验研究  

Experimental Study of Cooling With a Mist/Air Impinging Jet I

作　　者：谭晓茗[1] 刘波[1] 朱兴丹[1] 张靖周[1] 

机构地区：[1]江苏省航空动力系统重点实验室,南京航空航天大学能源与动力学院,江苏南京210016

出　　处：《工程热物理学报》2013年第12期2328-2331,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51076063)

摘　　要：针对单一空气冲击冷却以及不同流量比的水/气混合冲击冷却分别开展了实验研究,比较分析了加入水滴的气流中液滴蒸发相变换热对冲击冷却效果的增强作用,研究发现:气流是否夹带液滴对冲击壁面冷却效果的影响显著.加大液滴含量可以明显提高换热效果;加热板的热流密度大小也是一个重要影响因素.加热板的换热增强比随着热流密度的增大而减小,当热流密度q=6699 W/m^2,水/气比F_w/F_a=0.1412%时,驻点区的换热增强比最大可以达到4.1.An experimental system has been developed to study the heat transfer characteristics of air jet and different flow ratio of mist jets impinging. The effects of phase changing of the water droplets were studied to reveal the heat transfer enhancement. The results show that the key enhancement mechanism of mist/air impinging jet was the effects of droplets; increasing the mist flow ratio can enhance the heat transfer significantly. The heat flux of plate is another important reason. The heat transfer enhancement decreases as the wall heat flux increases, when heat flux q =6699 W/m2 and mist/air ratio Fw/F=O.1412%, the maximum heat transfer enhancement ration can reach to 4.1.

关 键 词：冲击冷却 水 气射流 相变 换热增强比 实验研究 

分 类 号：O354[理学—流体力学]