流动环境中二维铅垂纯射流的试验研究

对均匀流动环境中的铅直二维射流进行了试验研究,得到了流动转变的条件.采用超声多普勒流速仪(ADV)对射流流场进行了测量,得到了流速矢量图和流线图,发现在射流的迎流面存在流线跌落现象.探讨了流速比对射流背流面涡心和分离点位置的影响.给出低流速比为8的射流流场的实测结果,以供数值模拟对比使用.

An experimental study of 2-D vertical turbulent jets in flowing water

This paper presents an experimental study of 2-Dturbulent jets discharged vertically through a rectangle submerged pipe into flowing non-stratified water of finite depth.The experiments were carried out in laboratory facilities of a closed system capable of maintaining steady-state conditions,and the condition for the transform of flow type is presented. The relat ionship between the velocity ratio and the position of vortex located in the near of the jets and the separated point is given also. The velocity vector in the center plane and the rate of centerline velocity are obtained by the Micro ADV system for 3 kinds typical jets Based on the data of velocity,the streamline contours in center plane for the jets are obtained by the software of Teck plot 7.5. There is a fall off of the upstream streamline near the jets. The vector of jets with velocity ratio,8 is showed for com paring with the numerical simulation.