流动环境中三维圆形垂直浮力射流特性实验研究

为了揭示流动环境中三维圆形垂直浮力射流的规律，运用MicroADV流速测量系统和温度测量系统对不同射流——来流流速比情况下的圆形垂直热水浮力射流进行了实验研究。在对试验所得的速度场、温度场资料进行整理的基础上，对流场的流动结构，射流中出现的分叉现象，射流轨迹线，湍动能等时均特性和紊动特性进行了分析。认为基于最大速度和最高温度的射流轨迹线是不同的，射流横断面上两高温区的夹角的范围同前人在空气中所作试验是一致的。表明试验结果是可信的，可以用于揭示圆形浮力射流的规律和数值模拟的验证。

Experiments on a round turbulent buoyant jet in a cross flow

To reveal the characters of the jet-cross interaction, the three-dimensional round turbulent buoyant jets in a cross flow at different jet-to- cross velocity ratios were experimentally studied. On the base of the measuring of the velocity field using Micro ADV system, and the temperature field by the thermistor probes, both mean and turbulent physical parameters such as configuration of the flow, the bifurcation phenomena, the temperature and velocity trajectories, and the kinetic energy were analyzed. All trends are correctly predicted: the trajectory based on maximum velocity and maximum temperature is different, the included angle of the two high temperature regions in the cross section is proved to be in the same region with that in the air. Analytical results show that the experiment is believable and can be used as the demonstration of the numerical simulations.