Experimental investigation of three distinct mechanisms for the transition from sheet to cloud cavitation

doi:10.1016/j.ijheatmasstransfer.2022.123372

科研成果详情

题名	Experimental investigation of three distinct mechanisms for the transition from sheet to cloud cavitation
作者	Zhang，Guangjian 1,2; Zhang，Desheng 1; Ge，Mingming 3; Petkovšek，Martin 4; Coutier-Delgosha，Olivier 3
发表日期	2022-11-15
发表期刊	International Journal of Heat and Mass Transfer
ISSN/eISSN	0017-9310
卷号	197
摘要	The conventional high-speed images of cavitation with a set of X-ray phase contrast images reveal the presence of three different types of mechanisms responsible for large cloud shedding: re-entrant jet mechanism, condensation shock wave mechanism, and collapse-induced pressure wave mechanism. At higher cavitation numbers, the sheet cavity is relatively short and the cavity detachment is a consequence of a re-entrant jet pinching off the cavity from its leading edge. At lower cavitation numbers, the re-entrant jet plays a smaller role in the cavitation instabilities and the primary reason for periodic cloud shedding is the condensation shock mechanism where a void fraction discontinuity propagates upstream until collapsing the entire cavity. If the amount of shed vapour cloud reaches a certain extent, the collapse will emit a pressure wave strong enough to disturb the growing cavity, and subsequently make it detached from the wall. This is the third mechanism observed in the experiments. We point out the inappropriate classification of combining condensation shock and collapse-induced pressure wave mechanisms in the literature, since we identify pronounced differences between them: (i) the pressure increase across the condensation front is very weak (a few kPa) while the amplitude of collapse-induced pressure wave can be hundreds of kPa, (ii) the travelling velocity of the collapse-induced pressure wave within the cavity is much faster than the condensation shock, and (iii) the collapse-induced pressure wave does not result in an obvious discontinuity in void fraction when it propagates through the cavity, in contrary to the condensation shock.
关键词	Cavitation Cavitation instability mechanism Condensation shock Pressure wave Re-entrant jet
DOI	10.1016/j.ijheatmasstransfer.2022.123372
URL	查看来源
语种	英语English
Scopus入藏号	2-s2.0-85136481448
引用统计
文献类型	期刊论文
条目标识符	https://repository.uic.edu.cn/handle/39GCC9TT/12299
专题	个人在本单位外知识产出
通讯作者	Zhang，Guangjian
作者单位	1.Research Center of Fluid Machinery Engineering and Technology,Jiangsu University,China 2.Wenling Fluid Machinery Technology Institute of Jiangsu University,Wenling,317525,China 3.Kevin T. Crofton Department of Aerospace and Ocean Engineering,Virginia Tech,United States 4.Faculty of Mechanical Engineering,University of Ljubljana,Slovenia
推荐引用方式 GB/T 7714	Zhang，Guangjian,Zhang，Desheng,Ge，Mingminget al. Experimental investigation of three distinct mechanisms for the transition from sheet to cloud cavitation[J]. International Journal of Heat and Mass Transfer, 2022, 197.
APA	Zhang，Guangjian, Zhang，Desheng, Ge，Mingming, Petkovšek，Martin, & Coutier-Delgosha，Olivier. (2022). Experimental investigation of three distinct mechanisms for the transition from sheet to cloud cavitation. International Journal of Heat and Mass Transfer, 197.
MLA	Zhang，Guangjian,et al."Experimental investigation of three distinct mechanisms for the transition from sheet to cloud cavitation". International Journal of Heat and Mass Transfer 197(2022).