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开发了一套在线式粒子图像测速系统 ( PIV) ,并用水杯中水涡流实验验证了系统的可靠性 .利用该系统研究了旋流喷嘴射流的液滴运动速度 ,在线得到喷雾流场的双脉冲曝光数字化图像 ,即时用系统软件的图像分析模块进行分析 ,得到旋流喷嘴喷雾场的两维速度分布 .但在喷嘴近区域内得不到合理的速度结果 ,原因是该区域内液体未雾化成液滴 .液滴速度都小于理论喷射速度 ,且沿喷射方向呈减小趋势 ,表明液体在破碎成液滴后速度一直衰减 .旋流喷嘴射流轴线中心区域速度有一极小值 ,在喷雾锥边界附近有一速度极大值
An on-line particle image velocimetry system (PIV) was developed, and the water vortex test in the cup was used to verify the reliability of the system.The velocity of the droplet of the swirling nozzle jet was studied using this system, and the double pulse Exposure of the digitized images was instantaneously analyzed using an image analysis module of the system software to obtain the two-dimensional velocity profile of the swirler spray field, but a reasonable velocity result was not obtained in the vicinity of the nozzle because the liquid in the region was not fogged into Droplet velocity droplet velocity are less than the theoretical jet velocity, and along the jet direction decreases, indicating that the liquid velocity in the droplet has been broken after the droplet swirl jet jet center axis velocity has a minimum velocity in the spray cone boundary There is a maximum speed nearby