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应用PIV系统对矩形通道内横流-喷雾掺混过程中液滴沿横流方向的流场进行了实验测量。分别获得了单喷嘴和双喷嘴下横流掺昆中的流场结构,以及液滴的水平速度分布。横流作用下,液滴的最大水平速度为横流速度的两倍左右;反旋涡对降低了液滴的水平速度,提高了液滴在横流中的停留时间。双喷嘴条件下,横流截面上的液滴密集区域呈狭长的三角形,且液滴密集区域随着动量比的减小而变宽;在剪切力的作用下,液滴密集区域的两边上出现拟序结构.
The PIV system was used to measure the flow field along the cross-flow direction during the cross-flow-spray mixing in a rectangular channel. The structure of the flow field and the horizontal velocity distribution of the droplets are obtained respectively in the cross-flow doping under single nozzle and double nozzle. Under the action of cross flow, the maximum horizontal velocity of the droplet is about twice of the cross flow velocity. The anti-vortex vortex decreases the horizontal velocity of the droplet and increases the residence time of the droplet in the cross flow. Under the dual nozzle condition, the droplet-dense region in the cross-flow cross-section has a narrow triangular shape, and the droplet-dense region broadens with the decrease of the momentum ratio. Under the action of shearing force, the droplets appear on both sides of the dense region Proposed structure.