Research on transient characteristics of cavitation phenomena in pilot stage of jet pipe servo-valve

被引：0

作者：

Wu L. ^{[1
,2
]}

Chen K. ^{[1
,2
]}

Zhan C. ^{[1
,2
]}

机构：

[1] School of Machinery and Automation, Wuhan University of Science and Technology, Wuhan

[2] Engineering Research Center of Metallurgical Automation and Measurement Technology, Wuhan University of Science and Technology, Wuhan

来源：

High Technology Letters | 2020年 / 26卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Cavitation; Jet pipe servo-valve; Large-eddy simulation (LES); Multiphase flow;

D O I：

10.3772/j.issn.1006-6748.2020.01.011

中图分类号：

学科分类号：

摘要：

To obtain dynamic characteristics of cavitation and study the relationship between the cavitation and inlet pressure, large-eddy simulation (LES) is utilized to calculate unsteady flow field in the pilot stage. Lamb-Oseen vortex is observed. Simulation results show that vortex cavitation exists, and cloud cavitation begins to occur when inlet pressure reaches 7 MPa. Cavitation and cavitation-shedding are enhanced by the increment of inlet pressure. The main frequencies of the pressure oscillations of vortex cavitation and cloud cavitation increase with inlet pressure increasing. By comparing results of local cavitation and facet cavitation, it is known that cloud cavitation has a greater influence than vortex cavitation. Upon increasing the wedge length, the main frequency of vortex cavitation increases whereas that of cloud cavitation decreases, the volume fraction of the vapor phase and the energy efficiency decrease. Considering the above characteristics and the easiness of the process, the optimal wedge length is 0.03 mm. Copyright © by HIGH TECHNOLOGY LETTERS PRESS.

引用

页码：85 / 91

页数：6

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