Study on cavitation damage characteristics around a hollow-jet valve

Citation
Gy. Wang et al., Study on cavitation damage characteristics around a hollow-jet valve, JSME I J B, 42(4), 1999, pp. 649-657
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Mechanical Engineering
Journal title
JSME INTERNATIONAL JOURNAL SERIES B-FLUIDS AND THERMAL ENGINEERING
ISSN journal
1340-8054 → ACNP
Volume
42
Issue
4
Year of publication
1999
Pages
649 - 657
Database
ISI
SICI code
1340-8054(199911)42:4<649:SOCDCA>2.0.ZU;2-Z
Abstract
In this paper, to make clear the mechanism of cavitation damage around a ho llow-jet valve, cavitation damage test was conducted in a hollow-jet model valve. The eroded surfaces of specimens were observed by Scanning Electron Microscope (SEM) at different times of the test. Cavitation aspects were al so observed photographically by a high-speed camera. It was found that the damage occurs in cavitating flows around a hollow-jet valve with two patter ns. One is characterized by a big plastic crater, which seems to be generat ed by one blow event of cavitating vortex collapse near a specimen surface. Another is due to a small brittle irregular pit formed by the cumulative e ffects of many weaker blows, The former is the main cause to lead serious d amage. The high-speed photographic observations of the cavitation aspects s howed that more cavitating vortices in middle cavitation number state occur than these in other states. The damage tests also illustrated that the mid dle state is the most dangerous for cavitation damage around a hollow-jet v alve.