管内切向旋流的衰减特性研究

旋流强度是旋流研究中的一个关键性参数，它对旋流的应用特性有着决定性影响，文中以水为工质，用激光多普勒测速仪（ＬＤＶ）对管内由切向喷射方法产生的切向旋流进行了详细测量，根据测量结果对切向旋流的衰减特性进行了系统的研究和分析，并与文献中的有关结果进行了比较，得出了旋流强度的经验公式和旋流衰减的一般规律．

STUDY ON THE DECAY CHARACTERISTICS OF SWIRLING FLOW IN STRAIGHT PIPES

By use of a Laser-Doppler-Vdocimeter,velocity components and a few turbulence pa-rameters of swirling flow in long straight pipes were carefully measured in this paper,withthe swirl being produced by tangential injection of water into the tube at its inlet.Based onthe data measured in this study,swirl intensity at each measuring section was calculated, thedecay characteristics of swirl was investigated, and an equation for the calculation of swirlintensity was presented.Also the results obtained in this paper were compared with that inliteratures,a few important conclusions were reached.