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《Coal Science and Technology》 2018-05
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Experimental study on characteristics of self-resonating water jet for Helmholtz nozzle

HAN Jian;LIU Jing;CAI Tengfei;PAN Yan;MA Fei;School of Mechanical Engineering,University of Science and Technology Beijing;  
In order to improve the pre-extraction effect of low permeability coal seam,increase the erosion efficiency of self-resonating water jet for Helmholtz nozzle.The oscillating characteristics of self-resonating water jet generated by a series of Helmholtz nozzle in different structures was analyzed base on spectrum analysis method. The noise level when self-resonating water jet hits the target was detected using sound transmission technology and the cavitation effect of self-resonating water jet was discussed through analysis of noise power spectrum.The experimental results showed that comparing to the other nozzle,self-resonating water jet produced by Helmholtz nozzle has the best oscillating characteristic and cavitation effect; the spectrum structure of self-resonating water jet and the size of the self-resonating frequency are determined by the structure parameters of the upper portion of Helmholtz nozzle. While the oscillation cavity in the lower portion has selective function of amplification on spectrum amplitude of self-resonating water jet,yet it almost has no effect on the spectrum structure of self-resonating water jet. The cavitation generation is promoted by the upper portion of Helmholtz nozzle,while the cavitation effect is enhanced by the oscillation cavity in the lower portion. Research of the amplitude-frequency characteristics and noise power spectrum of the jet provides novel method for the design of self-resonating water jet nozzle.
【Fund】: 国家自然科学基金资助项目(51274021)
【CateGory Index】: TD712.6
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