液氮喷雾冷却换热特性实验研究  

Experimental Study on Spray Cooling Characteristics of Liquid Nitrogen

作　　者：佘阳梓[1,2] 蒋彦龙[2] SHE Yangzi;JIANG Yanlong(Suzhou Industrial Park Institute of Service Outsourcing,Suzhou 215000,China;Key Laboratory of Aircraft Environmental Control and Life Support Engineering,Ministry of Industry and Information Technology,Nanjing University of Aeronautics&Astronautics,Nanjing 210016,China)

机构地区：[1]苏州工业园区服务外包职业学院,苏州215000 [2]南京航空航天大学飞行器环境控制与生命保障工业和信息化部重点实验室,南京210016

出　　处：《南京航空航天大学学报》2022年第2期290-296,共7页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：航天低温推进剂技术国家重点实验室基础研究基金(SKLTSCP1811)。

摘　　要：通过搭建液氮喷雾冷却实验台,研究了TG6.5型实心锥喷嘴的喷雾冷却特性,分析了临界点附近的过热度和热流密度以及过热度和换热系数的关系,讨论了喷雾面积和喷雾流量对换热效果的影响。结果表明:在换热过程中,随着热流密度的增加,过热度变化可以分为缓慢增加、明显增加和急剧增加3个阶段,并且区间的分布和换热面积的大小关系密切。受核态沸腾过程中气泡的影响,出现最大换热系数时的过热度要小于达到临界热流密度时的过热度。增加喷雾流量能显著提高换热效果;增大热沉面积会降低单位面积内液滴颗粒冲击的频次和强度,换热效果下降。Spray cooling characteristics of TG6.5 solid cone nozzle are studied by building a liquid nitrogen spray cooling experimental bench.The relationships between the superheat and the heat flux as well as the superheat and the heat transfer coefficient near the critical point are analyzed.Then the influence of the spray area and the spray flow rate on the heat transfer effect is discussed.Results show that,in the process of heat transfer,with the increase of the heat flux,the change of superheat can be divided into three stages:a slow increase,an obvious increase and a sharp increase.Under the influence of bubbles in nucleate boiling,the superheat at the maximum heat transfer coefficient is less than that at the critical heat flux.Increasing the spray flow can significantly improve the heat transfer effect.Increasing the heat sink area will reduce the impact frequency and intensity of droplet particles in the unit area,so that the heat transfer effect will decrease.

关 键 词：液氮 喷雾冷却 换热特性 实验研究 

分 类 号：V241.0[航空宇航科学与技术—飞行器设计]