小位差比率射流元件内部流场PIV试验

PIV Investigate of Inner Flow of Fluidic Component with Small Offset Ratio

摘要:

采用PIV测试技术对小位差比率射流元件内部附壁射流流动进行了测量，得到了射流元件附壁流动速度场分布以及附壁点位置的准确数据，从而为数值模拟研究提供参照和判断。分别研究了流量、位差比率、补气孔距离、盖板尺寸对射流元件附壁流场的影响，并与数值模拟结果进行了对比。结果表明：一定范围内，流量和工作压力对附壁点位置基本无影响；小位差比率下附壁点距离比随位差比率增大而增大，得到了小位差比率下附壁点距离比与位差比率之间的关系式；附壁点距离随补气孔开孔位置变化先减小后增大；位差比率和盖板尺寸对射流元件附壁效果影响较大。

Abstract:

The inner flow of fluidic component with small offset ratio was measured by using particle image velocimetry (PIV). The velocity distribution of fluidic component and position of attachment point were obtained to provide reference for the numerical simulation in the future. The effects of flow rate, offset ratio, distance of air entrance hole, and cover size on the inner flow of fluidic component were analyzed and compared with numerical results. The results showed that in a certain range, the flow rate and working pressure had no effect on the distance of attachment point. The attachment point ratio increased with the increasing offset ratio. The relation equation of attachment point ratio and offset ratio was found. The distance of attachment point became shorter firstly then longer with the increasing distance of air entrance hole. The offset ratio and cover size were sensitive to offset jet flow.