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目的测试柴油喷雾液滴的速度及其分布特性. 方法用自行设计开发的PIV(粒子图像速度场仪)系统分析喷雾液滴的速度场. 结果与结论采用PIV系统拍摄了距喷孔10-50mm区域内的柴油喷雾液滴的平面流场,并采用基于成像放大及粒子图像相关原理的IBAS2000图像分析系统处理,得出喷雾液滴的速度大小及速度分布.“,”Aim To investigate the spray particle velocity and its distribution characteristics. Methods A set of PIV (particle image velocimetry) system was developed and used to observe and analyze the spray particle velocity field. Results and Conclusion Double-exposure image of the spray particle within the region of 10-50mm from the nozzle tip was recorded and analyzed by the IBAS2000 analysis system. Some characteristics of the spray particle velocity and its distribution were obtained.