摘要
通过流场显示及激光多普勒测速仪测定湍流特性等实验方法考察了管内的无伴流约束射流。结果表明，在管内作无伴流射流时，环流区的起始点显著提前，环流区的终点位置基本不受射流流量的影响，但终点位置随射流入口直径变小而向下游移动，环流区中心轴上的湍流强度大幅度增强。
The recirculation phenomena and turbulence characteristics in non-ambient flow confined jets inside the tubes were explored.Laser Doppler Anemometry was used for the flow field visualization.The experimental results indicated that when the non-ambient flow confined Jets conducted in tubes,the initial point of recirculation zone advanced remarkably,the jets flow rate bssically have no effect upon position of ending point,but the ending point moved down stream with decrease of diameter of Jet port,and the turbulent strength largely increased in the axis of reclrculation zone.
关键词
约束射流
湍流
环流
伴流
confined jets
turbulence
ambient flow
recirculation.
