【摘要】 本文介绍用热线风速仪对湍流射流的测量结果。射流由直径为3.91,5.53,8.74及12.36毫米四个圆形喷管射出,环境是静止大气。射流出口速度从16米/秒到270米/秒。测量内容包括四部分,第一,沿射流轴线平均速度及湍流强度随纵向距离的变化,第二,在射流充分发展为湍流的区域,对平均速度、湍流强度及雷诺应力的径向分布做了测量,第三,为了探讨射流的统计特性,对三次矩u(?)和四次矩u(?)也作了测量,第四,在射流中心测量了自相关系数并做了能量谱分析。更多还原

【Abstract】 The measurments of turbalent jet have been made using a crossed hot-wire anemometer The air jet issues from four nozzles which diameters arc 3.91,5.53,8.74 and 12.36mm respectively.The ambience is still air The issuing velocity of jet is from 16m/s to 270m/s.The measurements heve been divided into four parts.(1) The longitudinal variations of the mean velocity and turbulence intensity on the jet axis;(2) The radial distribution of moan velocity,turbulence intensity and shear-stress in the fully developed region;(3) Third and fourth order moments;(4) Self-c.orrelation coefficient and one-dimensional spectra of uz on the jet axis.更多还原