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Open AccessArticle

An Experimental Study on the Jet Pressure Performance of Organ–Helmholtz (O-H), Self-Excited Oscillating Nozzles

by Xiaochuan Wang 1,2, Yueqin Li 1,2, Yi Hu 1,2,*, Xiaolong Ding 1,2,3, Meijing Xiang 1,2 and Deng Li 1,2
1
Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan 430072, China
2
School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China
3
Chinese Ship Research and Design Center, Wuhan 430064, China
*
Author to whom correspondence should be addressed.
Energies 2020, 13(2), 367; https://doi.org/10.3390/en13020367
Received: 19 November 2019 / Revised: 2 January 2020 / Accepted: 3 January 2020 / Published: 12 January 2020
(This article belongs to the Special Issue Engineering Fluid Dynamics 2019-2020)
To make a better application of the self-excited oscillation jet, a compound organ–Helmholtz oscillation nozzle (OH nozzle) was designed to generate better pulse effects in the present study. The effects of geometric parameters on pressure characteristics of self-excited oscillation jets were investigated experimentally. The geometric parameters of OH nozzles were determined based on the design principle of the organ-pipe and Helmholtz nozzles. Various types of OH nozzles were tested to obtain the relationship between oscillation pressure and geometric parameters. Experimental results showed that some structural parameters are sensitive to the pump pressure, while others are not. The optimum geometric optimum parameters were obtained based on experimental results. The peak pressure and pressure pulsation amplitude are closely related to the target distance. The peak pressure decreases sharply with target distance at first and decreases with a further increase of the target distance. The peak pressure becomes stable beyond a certain range of target distance. With the increase of the target distance, the pressure pulsation amplitude increases at first and then decreases. The optimum target distance was determined based on experimental results to achieve better pulsation performance and has a value of 20 mm in the present study. View Full-Text
Keywords: self-excited oscillation jet; organ–Helmholtz nozzle; pulse waterjet; pressure pulsation amplitude self-excited oscillation jet; organ–Helmholtz nozzle; pulse waterjet; pressure pulsation amplitude
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Wang, X.; Li, Y.; Hu, Y.; Ding, X.; Xiang, M.; Li, D. An Experimental Study on the Jet Pressure Performance of Organ–Helmholtz (O-H), Self-Excited Oscillating Nozzles. Energies 2020, 13, 367.

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