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Appl. Sci. 2017, 7(9), 932; doi:10.3390/app7090932

Frequency Modulation and Erosion Performance of a Self-Resonating Jet

1
Key Laboratory of Hydraulic Machinery Transients, Ministry of Education, Wuhan University, Wuhan 430072, China; chuan@whu.edu.cn (W.L.); xcw001@whu.edu.cn (X.W.); 2008lee@whu.edu.cn (D.L.)
2
Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan 430072, China
3
School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China
4
Shanghai Marine Equipment Research Institute, Shanghai 200030, China; mingxing1991zhang@163.com
5
Wuhan Hangda Aero Science & Technology Development CO., LTD, Wuhan 430072, China; zhouyongxiang@whu.edu.cn
*
Author to whom correspondence should be addressed.
Received: 7 August 2017 / Revised: 7 September 2017 / Accepted: 7 September 2017 / Published: 10 September 2017

Abstract

The self-resonating water jet offers the advantages of both a cavitation jet and a pulsed jet, and thus has been widely used for many practical applications. In the present study, the 120° -impinging edge Helmholtz nozzle was investigated for better erosion performance. The oscillating mechanism was analyzed from both numerical and experimental perspectives. The results showed that the cavitation clouds in the chamber dominate the oscillating frequency. The frequency resulting from the non-linear interaction was also observed in the simulation. The dominant frequency increases linearly as pressure decreases without entrained air. The frequency modulation was achieved through various inspiratory methods, and the modulation range was dependent on the pressure drop. The erosion performance was improved with entrained air, and the improvement was effected by the inspiratory method. The oscillating frequency was determined by the forced frequency of entrained air, and the best erosion performance was achieved at the frequency closest to the fundamental frequency. A feasible method to improve the erosion performance was investigated in this preliminary study, which could provide a guide for practical applications. View Full-Text
Keywords: self-resonating jet; frequency modulation; erosion performance; forced excitation self-resonating jet; frequency modulation; erosion performance; forced excitation
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MDPI and ACS Style

Liu, W.; Kang, Y.; Zhang, M.; Zhou, Y.; Wang, X.; Li, D. Frequency Modulation and Erosion Performance of a Self-Resonating Jet. Appl. Sci. 2017, 7, 932.

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