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Formation Principle and Characteristics of self‑supercharging Pulsed Water Jet

Chinese Journal of Mechanical Engineering 2022年第3期35卷 250-263页

作者： Zhaolong Ge Yuanfei Ling Jiren Tang Yiyu Lu Yangkai Zhang Lei Wang Qi Yao State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400030China National&Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam Chongqing UniversityChongqing 400030China College of Source and Safety Chongqing UniversityChongqing 400030China

High-pressure pulsed water jet technology has considerable development potential in the field of rock *** overcome the shortcomings of existing pulsed jets,a self-supercharging pulsed water jet(SSPWJ)generation method is proposed,which is based on the theory of the pulsed water jet and the principle of hydraulic *** proposed method changes the flow direction of the fluid medium through the valve core to make the piston reciprocate in the cylinder and relies on the effective area difference between the front and rear chambers in the stroke stage of the piston to realize the organic combination of“pulse”and“supercharging”of the jet,thus forming an *** the basis of the formation principle of the SSPWJ,a SSPWJ testing platform was constructed,and tests were performed on the jet pressure acquisition,morphology capture,and granite *** the jet pressure and the jet morphology exhibited periodic changes,and a higher pulse pressure was obtained at lower inlet *** error of the pressure ratio calculated according to the experimental results was<3%relative to the theoretical design value,confirming the feasibility of the *** pulse pressure and pulse frequency are controllable;that is,as the inlet flow rate increases in the stroke stage of the piston,the pulse pressure and pulse frequency increase,and the pulse duration *** the inlet flow rate increases in the backward-stroke stage of the piston,the pulse frequency increases,and the pulse pressure and pulse duration remain *** the combined action of the waterhammer pressure,high-speed lateral flow,and high-frequency dynamic load of the SSPWJ,local flaky exfoliation was observed when the granite surface was *** results of this study lay the foundation for enriching the theory of pulsed jet generation and expanding its application range.

关键词： Pulsed water jet self-supercharging Pulse parameters Jet morphology Granite breaking

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