静止浅水环境中铅垂紊动射流的试验研究  

Experimental study on vertical turbulent jet discharged from the bottom of shallow water

作　　者：槐文信[1] 那宇彤[1] 童汉毅[1] 李爱华[1] 

机构地区：[1]武汉大学河流工程系,湖北武汉430072

出　　处：《水利学报》2002年第9期32-36,共5页Journal of Hydraulic Engineering

基　　金：国家自然科学基金项目 (5 98780 19);教育部骨干教师资助计划项目

摘　　要：对静止均匀浅水域中的铅垂紊动射流进行了试验研究 ,得到了水面的隆起高度与射流出口单位能量和相对水深的函数关系 ,验证了隆起高度满足高斯分布 ,具有自相似性 ,并给出了统一表达式 ;借助于三维测速仪 ,得到了射流中心平面流场 ,结果表明射流中线流速的衰减比自由射流为快 ,随着射流出口流量的增加 。A turbulent jet vertically discharged from a rectangular submerged pipe at the bottom into still non stratified water with finite depth is studied experimentally.The functional relationships of maximum water surface apophysis related to the energy flux at the spout and relative water depth are obtained.A self preservation law of surface apophysis distribution is found and a universal empirical formula is established.The variation of velocity vector along the centerline of the jet and the whole flow field are measured by means of 3 D micro ADV.Based on the data the vorticity contours of the jet are obtained.it is concluded that the attenuation rate of velocity follows the same law even if the discharge is changed,but it varies with the variation of water depth.Furthermore,the attenuation rate is quicker than that of free jet and the vorticity at the spout increases with the increase of discharge.

关 键 词：铅直紊动射流 浅水 试验 表面隆起 速度衰减率 

分 类 号：O358[理学—流体力学]