Analysis of Macroscopic Cavitation Characteristics of a Self-Excited Oscillating Cavitation Jet Nozzle

IF 1.1 4区工程技术 Q4 MECHANICS

Journal of Applied Fluid Mechanics Pub Date : 2023-11-01 DOI:10.47176/jafm.16.11.1923

Y. Zhao, G. Li, Fei Zhao, X. Wang, W. Xu

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引用次数: 0

Abstract

The self-excited oscillating cavitation jet nozzle (SEOCJN) serves as a crucial component for converting hydrostatic energy into dynamic pressure energy and ensuring optimal hydraulic and cavitation performance of cavitating jets. Thus, it is of crucial significance to understand the cavitation characteristics and the influence law of SEOCJN for its extensive industrial applications. This paper utilizes numerical simulation methods to analyze the dynamic process of cavitation initiation, development, and outlet cavitation performance of SEOCJN. It explores the effects of inlet pressure and flow rate on the frequency characteristics of SEOCJN, and establishes a mathematical relationship between self-excited oscillation frequency and outlet flow frequency. The results indicate that the self-excited oscillation nozzle has an inlet diameter (D1) of 4.7 mm, an outlet diameter (D2) of 12.2 mm, a length (L) of 52 mm, a chamber diameter (D) of 83 mm, an oscillation angle of 120°, and an inlet pressure (Pin) of 4.8 MPa. At these parameters, the frequency of the pulse jet reaches 830.01 Hz, with an internal flow period of approximately 0.0024 s. The maximum vapor volume fraction is found to be located 0.28 m from the outlet of the SEOCJN. Furthermore, the frequency of self-excited oscillation pulse increases with an increase in inlet pressure. These findings provide a theoretical basis for the industrial application of self-excited oscillation cavitation jet nozzles.

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自激振荡空化喷嘴的宏观空化特性分析

自激振荡空化射流喷嘴(SEOCJN)是将静水能转化为动压能，保证空化射流水力和空化性能最佳的关键部件。因此，了解SEOCJN的空化特性及其影响规律对其广泛的工业应用具有重要意义。本文采用数值模拟的方法分析了SEOCJN空化产生、发展及出口空化性能的动态过程。研究了进口压力和流量对SEOCJN频率特性的影响，建立了自激振荡频率与出口流量频率之间的数学关系。结果表明:该自激振荡喷管的进口直径D1为4.7 mm，出口直径D2为12.2 mm，长度L为52 mm，腔室直径D为83 mm，振荡角120°，进口压力Pin为4.8 MPa。在这些参数下，脉冲射流的频率达到830.01 Hz，内部流动周期约为0.0024 s。最大蒸汽体积分数位于离SEOCJN出口0.28 m处。此外，自激振荡脉冲的频率随进口压力的增加而增加。这些研究结果为自激振荡空化喷嘴的工业应用提供了理论依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Applied Fluid Mechanics THERMODYNAMICS-MECHANICS

CiteScore

2.00

自引率

20.00%

发文量

138

审稿时长

>12 weeks

期刊介绍： The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating. The motivation for this new fluid mechanics journal is driven by the following points: (1) there is a need to have an e-journal accessible to all fluid mechanics researchers, (2) scientists from third- world countries need a venue that does not incur publication costs, (3) quality papers deserve rapid and fast publication through an efficient peer review process, and (4) an outlet is needed for rapid dissemination of fluid mechanics conferences held in Asian countries. Pertaining to this latter point, there presently exist some excellent conferences devoted to the promotion of fluid mechanics in the region such as the Asian Congress of Fluid Mechanics which began in 1980 and nominally takes place in one of the Asian countries every two years. We hope that the proposed journal provides and additional impetus for promoting applied fluids research and associated activities in this continent. The journal is under the umbrella of the Physics Society of Iran with the collaboration of Isfahan University of Technology (IUT) .