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Impact Performance of Helmholtz Self-Excited Oscillation Waterjets Used for Underground Mining

1
School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China
2
Changjiang Yichang Waterway Engineering Bureau, Yichang 443000, China
3
Yangtze River Waterway Engineering Bureau Co., Ltd., Wuhan 430021, China
4
Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, Wuhan 430072, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(16), 3235; https://doi.org/10.3390/app9163235
Received: 30 June 2019 / Revised: 4 August 2019 / Accepted: 7 August 2019 / Published: 8 August 2019
(This article belongs to the Section Energy)
Pulsed waterjets are widely used in exploitation of fossil fuels for their high efficiency. With the aim to further clarify the impact performance of Helmholtz self-excited oscillation waterjets (HSEOW), numerical and experimental studies were conducted. The morphological characteristics of the erosion surfaces between conical and HSEOW nozzles were compared and the cavitation evolution was obtained. Results show that the cavitation damage caused by the HSEOW nozzle on the specimen was mainly caused by the jet cavitation cloud under submerged conditions. The cavitation effect produced by the HSEOW nozzle had a much greater destructive effect than that of a conical nozzle. The mass loss caused by HSEOW nozzles increased first with the increase of standoff distance, then decreased rapidly after reaching the maximum value. Moreover, the density of holes and the damage intensity weakened with the increase of radial distance. A dimensionless cavity length of 2 and a dimensionless cavity diameter of 8 was the optimal structure that led to maximum mass loss. These results provide a further understanding of cavitation mechanism which leads to the impact performance of pulsed water jets and optimal working parameters in the field of energy exploitation. View Full-Text
Keywords: energy exploitation; pulsed waterjet; Helmholtz oscillator; impact performance energy exploitation; pulsed waterjet; Helmholtz oscillator; impact performance
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MDPI and ACS Style

Fang, Z.; Gao, X.; Tao, X.; Li, D.; Zhang, M.; Xiong, T.; Jiang, P. Impact Performance of Helmholtz Self-Excited Oscillation Waterjets Used for Underground Mining. Appl. Sci. 2019, 9, 3235.

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