CAJ | 학술논문

针对闭式脉动热管搭建试验平台，用紫铜管做试件，管内径2．7mm，全长1384mm，6弯头，丙酮为工质，采用底部电加热、上部分别采用强制对流冷却和自然对流冷却，分析了强制对流下脉动热管的启动特征及性能，对比了不同冷却方式对脉动热管启动性能的影响。结果表明，脉动热管在强制冷却下存在两种启动方式：低功率下呈现间歇性温度突变型启动特征；高功率下呈现光滑缓慢连续启动特征并可以稳定运行。强制对流冷却方式不仅能够改善脉动热管传热，更有助于脉动热管的稳定运行。
침대폐식맥동열관탑건시험평태，용자동관주시건，관내경2．7mm，전장1384mm，6만두，병동위공질，채용저부전가열、상부분별채용강제대류냉각화자연대류냉각，분석료강제대류하맥동열관적계동특정급성능，대비료불동냉각방식대맥동열관계동성능적영향。결과표명，맥동열관재강제냉각하존재량충계동방식：저공솔하정현간헐성온도돌변형계동특정；고공솔하정현광활완만련속계동특정병가이은정운행。강제대류냉각방식불부능구개선맥동열관전열，경유조우맥동열관적은정운행。
The experiments were conducted on a close loop pulsating heat pipes (PHPs) which consist of a six-bended copper tube.The inside diameter of the capillary tube is 2.7mm and the working fluid is selected as acetone.PHPs are 1384mm.Vertical bottom adopted electrical heating,top natural cooling and forced cooling was adopted respectively.Analyze the start-up operational characteristics of the PHPs under forced cooling and compare the start-up characteristics of closed loop pulsating heat pipes under difference types of cooling.Results show that the PHPs have two kinds of start-up modes:An intermittent and apparent temperature overshoot process at lower heating power,a smooth continual start-up process incorporating with a steady operation at higher heat-ing power;Forced cooling can improve PHPs heat transfer and contribute to the steady operation.