CAJ | 학술논문

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N-ACA16012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。
수익상운공화형성급연화적과정시일개겁기복잡적비정상과정。문장이용고속섭영기술，이횡절면위N-ACA16012적삼유뉴곡수익위연구대상，재일정적공각화공화수하，대운공화적산생화연화과정진행료시험관찰。결과현시，운공화적산생여회사류유관，불동결구적회사류조성편공화탈락적궤제불동。운공화구유복잡적삼유결구，시험증실료운공화중선와결구적존재。분석표명，운공화적발전여U형와결구적형성화연화밀절상관。
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 anal-ysed, 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 struc-ture. The analysis shows that the development of cloud cavitation is closely related to the development of U shaped vortex structure.