静止浅水环境中铅垂紊动射流的试验研究

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，射流出口处涡量亦增大。

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

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.