逆向载荷下矩形通道内水流动沸腾临界热流密度  

Critical Heat Flux for Water Flow Boiling in a Rectangular Tube Under Inverse Load

作　　者：张钊[1] 宋保银[1] 宋军辉[1] 李冈[1] Zhang Zhao;Song Baoyin;Song Junhui;Li Gang(College of Aerospace Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing,210016)

机构地区：[1]南京航空航天大学航空宇航学院,南京210016

出　　处：《制冷与空调（四川）》2018年第5期470-475,共6页Refrigeration and Air Conditioning

基　　金：国家自然科学基金资助项目(50576035)

摘　　要：临界热流密度(CHF)是流动沸腾过程中一个重要的参数,在旋转平台上以蒸馏水为工质,采用单侧加热的矩形通道,对逆向载荷下两种不同加热方位下的流动沸腾CHF特性进行了实验研究,获得了逆载下发生临界换热时的质量流速、入口压力、实验段压降和壁温的变化特性。研究讨论了逆载、入口温度、质量流速和加热方位对CHF的影响。结果表明:临界换热现象发生时,壁温迅速上升,有效热流密度迅速减少,实验段压降增大,质量流速减小;逆载和质量流速越大,CHF越大;入口温度越高,CHF越小,同时加热方位对CHF也有明显影响。Critical heat flux is an important parameter in flow boiling. Experimental investigation into flow boiling CHFcharacteristics in a rectangular tube under inverse load was performed on a rotational platform for distilled water heated unilaterallyin two orientations. The change trends of mass velocity, inlet pressure, the pressure drop in test section and wall temperature beforeand after reaching CHF were obtained. The effects of inverse load, inlet temperature, mass velocity and heating orientation on flowboiling CHF were analyzed. The results show that the wall temperature rises rapidly, the effective heat flux decreases, the pressuredrop increases and the mass velocity decreases after the critical heat transfer occurs. CHF increases with the increases of massvelocity and the inverse load, but decreases with the increase of inlet water temperature. Heating orientation has an obviouslyinfluence on CHF.

关 键 词：逆载 临界热流密度 矩形通道 加热方位 实验研究 

分 类 号：V211.1[航空宇航科学与技术—航空宇航推进理论与工程]