Design and experimental research of the continuous feeding system of premixed abrasive water jet

doi:10.11835/j.issn.1000-582X.2018.08.012

Home > Archive>Volume 41, Issue 8, 2018 >111-120. DOI:10.11835/j.issn.1000-582X.2018.08.012

Design and experimental research of the continuous feeding system of premixed abrasive water jet
DOI:
                        10.11835/j.issn.1000-582X.2018.08.012
                    
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                        LU YiyuLU Yiyu
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, P. R. China;National & Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, Chongqing University, Chongqing 400044, P. R. China
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LI LiangweiLI Liangwei
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, P. R. China;National & Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, Chongqing University, Chongqing 400044, P. R. China
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TANG JirenTANG Jiren
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, P. R. China;National & Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, Chongqing University, Chongqing 400044, P. R. China
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ZHANG WenfengZHANG Wenfeng
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, P. R. China;National & Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, Chongqing University, Chongqing 400044, P. R. China
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LI QianLI Qian
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, P. R. China;National & Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, Chongqing University, Chongqing 400044, P. R. China
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LU XiaohuiLU Xiaohui
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, P. R. China;National & Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, Chongqing University, Chongqing 400044, P. R. China
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Abstract:

To improve continuous supply ability of present pre-mixed abrasive water jet (AWJ) system, a new method is proposed to realize continuous feeding using the principle of jet pump suction and mixed abrasive. Entrainment of abrasive in pump mixing chamber is attributed to negative pressure field formed by ejection of a certain speed pressurized water from the jet pump nozzle. Abrasive mingled with water in chamber flows through throat pipe and diffusion pipe into high pressure hose, and transforms into required AWJ by acceleration of cutting nozzle. Based on analysis of structure and working principle, structure and size are designed for this continuous feeding system. Numerical simulation method is used to optimize the design of the area ratio of cutting nozzle and jet pump nozzle, which influences continuous feed and jet performance. Area ratio impact on system performance and optimal value range are analyzed and determined, respectively. System performance is verified by laboratory pressure test, continuous sand and cutting experiments. The result indicates that negative pressure and sufficient pressure gradient formed at abrasive inlet under suitable area ratio structure are beneficial for absorption and acceleration process, besides, the front of cutting nozzle still retain enough static pressure that can be converted into kinetic energy to facilitate efficient continuous operation of premixed abrasive water jet system.

Key words:abrasive water jet;abrasive feed;jet pump;fluent;parameter optimization

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卢义玉,李良伟,汤积仁,章文峰,李倩,陆晓辉.前混合磨料水射流连续加料系统设计与实验研究[J].重庆大学学报,2018,41(8):111~120

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Received:March 01,2018
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Online: August 01,2018
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