摘要
水翼上云空化形成及演化的过程是一个极其复杂的非定常过程。文章利用高速摄影技术,以横截面为NACA16012的三维扭曲水翼为研究对象,在一定的攻角和空化数下,对云空化的产生和演化过程进行了试验观察。结果显示,云空化的产生与回射流有关,不同结构的回射流造成片空化脱落的机制不同。云空化具有复杂的三维结构,试验证实了云空化中旋涡结构的存在。分析表明,云空化的发展与U型涡结构的形成和演化密切相关。
The process of sheet cavitation shedding to cloud cavitation is highly complex and unsteady. In this paper, the generation and development of cloud cavitation around a three dimensional twisted hydrofoil which has a NACA16012 profile at certain attack angle and cavitation numbers was observed and analysed, using two high speed video cameras. The experimental results show that the generation mechanism of cloud cavitation is related to re-entrant jet, and different kinds of re-entrant jets create different kinds of shedding. Cloud cavitation is a complicated three dimensional structure, in which there exists a vortex structure. The analysis shows that the development of cloud cavitation is closely related to the development of U shaped vortex structure.
出处
《船舶力学》
EI
CSCD
北大核心
2014年第5期485-491,共7页
Journal of Ship Mechanics
基金
国家自然科学基金(11072223
11332009)
关键词
三维扭曲水翼
云空化
试验观察
U型涡结构
three dimensional twisted hydrofoil
cloud cavitation
experimental observation
U shaped vortex
