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ARTICLE
Effects of U-shaped two-step throttling groove parameters on cavitation erosion characteristics
| 1 | School of Mechanical Engineering, Nanjing Institute of Technology, Jiangsu, China |
| 2 | School of Mechanical and Power Engineering, Nanjing University of Technology, Jiangsu, China |
CORRESPONDING AUTHOR
Submission date: 2021-03-09
Final revision date: 2021-04-30
Acceptance date: 2021-05-13
Online publication date: 2021-09-04
Publication date: 2021-10-20
KEYWORDS
TOPICS
ABSTRACT
Throttling usually occurs when a fluid passes through an orifice, sometimes even severe cav-
itation erosion may occur. In this study, the equation for the cavitation index of a throttling
valve was proposed and the cavitation erosion area in the throttle valve was found to change
its position with the orifice opening (X). Cavitation features of singular and two-port se-
ries throttling grooves were characterized by defining cavitation indexes σ1and σ2, because the cavitation index-σ can determine the occurrence and intensity of cavitation. Then the indexes σ1 and σ2 included internal geometric parameters and external pressure boundaries were obtained, and cavitation indexes curves σ1-X and σ2-X were also plotted. From the
curves of the cavitation index, it was observed that cavitation concentration section also
would transfer with opening X changes in the U-shaped groove. The depth of the U-shaped
groove had a more evident impact on cavitation, whereas the effect of width on cavitation
erosion was not so obvious. The intensity of cavitation erosion when the fluid flowed into
the orifice section of the U-shaped groove was always larger than that when the fluid flowed
away.
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