涡流二极管内空化流动的实验研究  

EXPERIMENTAL STUDY ON THE CAVITATION FLOW IN VORTEX DIODE

作　　者：尹俊连[1] 刘锦涛[1] 焦磊[1] 王乐勤[1] 

机构地区：[1]浙江大学化工机械研究所,浙江杭州310027

出　　处：《工程热物理学报》2010年第5期769-772,共4页Journal of Engineering Thermophysics

基　　金：中国博士后科学基金资助项目(No.20080431323);浙江省自然科学基金项目资助(No.Y107467)

摘　　要：为了研究涡流二极管内空化流动的发展过程及对其性能的影响,对其空化现象的标志性现象—空气柱进行了试验研究,试验中捕捉了空气柱的形成过程,记录了不同雷诺数及不同出口背压下的空气柱尺寸,最后测量并对比了不同空气柱尺寸下的涡流二极管的性能。试验结果表明;空气柱是微气泡由于亨利定律在旋转流场形成的压力梯度下而发生的输运效应形成的;空气柱随雷诺数的增大而增大,不同雷诺数下的增大速度有所不同;相同流量下,出口背压越大,空气柱尺寸越小,涡流二极管的性能越高。上述结论对涡流二极管的设计及其指导工程应用具有重要的价值。To investigate the development of cavitation flow in vortex diode and its effect on the performance,experiment was carried out focusing on the prominent phenomenon—air core.The process of formation of air core and its development was captured and the dimensions in different Reynolds number and different out pressure were record.Eventually,comparison was done to the air core dimension＇s effect on the performance of vortex diodes.The results show that the formation of air core can be ascribed to the transport of micro-bubbles due to the pressure gradient in swirling flow according to Henry law;The air core＇s dimension increases with Re presenting a different tendency in different Re.However,the air core decreases when the out pressure increases with the same flow rate and the performance of vortex diode can be improved.The above-mentioned conclusions are very valuable to the design of vortex diode and to guiding the application in engineering.

关 键 词：空化 空气柱 涡流二极管 

分 类 号：TQ056.2[化学工程]