基于PIV的大豆蛋白液双枪喷涂速度场的研究

目的 为了在保证喷涂雾化表征均匀性的前提下实现宽幅覆膜，提高覆膜的效率，以期得到均匀一致的大豆蛋白覆膜。方法 利用粒子图像速度场仪（Particle Image Velocimetry,PIV），对不同干涉程度下的大豆蛋白液双枪喷涂雾化场进行拍摄，利用PIV和Origin软件处理图像，得到速度数据并对比。结果 随着双枪间偏转角的增大，基线上的平均速度减小；偏转角为0°时，两喷雾粒子流在干涉线处碰撞，少有透过干涉线的粒子；在不同偏转角下，基线上的速度峰值从大到小为偏转角7°时的速度峰值、偏转角0°时的速度峰值、偏转角15°时的速度峰值；当偏转角为0°时，随着液压的增大，基线上的第2个速度谷值会右移，并且会增大直至消去。结论 当偏转角为0°、液压为0.24 MPa时，在基线上干涉区域内的速度最均匀。

Double-nozzle Spraying Velocity Field of Soybean Protein Liquid Based on PIV

The work aims to achieve wide coating on the premise of ensuring the uniformity of spray atomization characterization, improve the efficiency of coating, and get uniform and consistent coating of soybean protein. A Particle Image Velocimetry (PIV) was used to take pictures of the spraying atomization field of soybean protein liquid under different interference degrees between two spray nozzles. PIV and origin software were used to process the images, and the speed data were obtained and compared. With the increase of deflection angle between two nozzles, the average velocity at baseline decreased. When the deflection angle was 0°, two spray particles collided at the interference line, and few particles passed through the interference line. The velocity peak on the baseline appeared at different deflection angles of 7°, 0°, and 15°. When the deflection angle was 0°, with the increase of hydraulic pressure, the second velocity valley value on the baseline moved to the right and increased until it disappeared. When the deflection angle is 0° and the hydraulic pressure is 0.24 MPa, the velocity is the most uniform in the interference region at the baseline.