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中文摘要：
为了解空化发展与流场中涡量变化的关系，利用数字式粒子图像测速（DPIV）系统，并辅以高速摄像，对绕水翼流动进行了观测．结果表明：空化的发展对整个流场的涡量变化起决定作用．无论在空化还是无空化流场中，涡量主要集中在水翼后部的剪切层所在区域，并形成涡带；随着空化数的降低，空化区域的流场混合更为均匀，从而使涡量峰值逐渐减小，同时下涡带的起始位置向后推移；在云状空化阶段，涡量聚集区由涡带转化为大涡量团的分散分布，而且影响区域明显扩大．
英文摘要：
To indicate the characteristics of vorticity distribution in a cavitating flow field, cavitating flows around a hydronautics foil are measured by means of a digital particle image velocimetry （DPIV） system and a high-speed video camera. The results showed that changes of vorticity distributions in the flowing fields depend on the development of cavitation structures. Most vortices can be seen near the shear-layer area in all cases, and behave as vorticity bands. With decrease of cavitation numbers, the vorticity value lowers since there is no large grad in its velocity in the cavitation area, and the inceptive position of the lower vortex band moves downstream. At the cloud-cavitation stage, the vorticity bands become more dispersed and behave as many vorticity group.
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