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

Xiaochuan Wang, Yueqin Li, Yi Hu, Xiaolong Ding, Meijing Xiang and Deng Li
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Xiaochuan Wang: Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan 430072, China
Yueqin Li: Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan 430072, China
Yi Hu: Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan 430072, China
Xiaolong Ding: Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan 430072, China
Meijing Xiang: Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan 430072, China
Deng Li: Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan 430072, China

Energies, 2020, vol. 13, issue 2, 1-18

Abstract: 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.

Keywords: self-excited oscillation jet; organ–Helmholtz nozzle; pulse waterjet; pressure pulsation amplitude (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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