流动环境中二维铅垂纯射流的试验研究

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

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。

This paper presents an experimental study of 2D turbulent 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 relationship 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 Teckplot75 There is a fall off of the upstream streamline near the jets The vector of jets with velocity ratio, 8 is showed for comparing with the numerical simulation