数字粒子图像测速技术(DPIV)是近年来发展起来并得到重视的流场测量新技术.本文开发了一套用于燃油喷雾流场研究的DPIV测速系统.该系统包括全透明玻璃容器、光导系统、X-Y坐标系统, 和控制喷嘴、激光器、CCD相机动作时序的同步信号控制系统,从而能全过程拍摄燃油雾化全场.利用该系统所进行的柴油喷雾实验表明,喷雾与空气相互作用产生卷吸现象,在局部雾化区域形成涡流.

Digital Particle Image Velocimetry (DPIV) is a new technology of fluid velocity measurement developed recently , and it has gain more and more attention. This paper expounds the basic principles of DPIV, and develops a set of DPIV measurement system, which is used to study the fuel spray. The system contains a transparent glass vessel, a flexible high powered light guide, a precise X - Y reference frame and a synchronous signal control device which can accurately control the action of the nozzle, the laser system and the CCD camera. Using this system, the whole fuel spray field can be observed from beginning to end. The results of diesel spray experiment show the entrainment phenomenon between surrounding gas and diesel spray, and the vortexes appear in parts of the atomizing area.