在流动水体中周边射流的稀释

Mixing of Horizontal Radial Jets in a Current

本文提出用带活动盖板的喷口形式防止海水与泥沙入侵甚至破坏水下放流系统,并增加污水出口初始稀释度。应用自相似假说分析得到了这种喷口形成的水平周边射流的最大速度衰减率为r^(-1.5),由此根据运动叠加原理推导了在流动水体中近区污水场形状和稀释度的计算公式。同时从紊动混合的机理出发推导了污水场后续扩散与稀释的计算公式。实验证明水平周边射流比垂直自由射流初始稀释度大很多,且污水出露点大为远移。

A type of port with a movable cover is designed to increase initial dilution and prevent sea water and sediments from intruding into outfall systems. Horizontal radial jets produced by this type of port in a current are investigated experimentally and theoretically. The analysis based on Reynolds' equations and self-similarity hypothesis gives that the maximum velocity of radial jets decay with r-1.5. The ralationships between the width, thickness, average dilution of a submerged wastefield along flow cause and the parameters of the port, jet, ambient are estabilished quantitatively and verified by experiments. It is demonstrated that dilution of horizontal radial jets is much higher than that of vertical round jets and surface boil point of the former is much more distant than that of the latter.