前混合磨料水射流连续加料系统设计与实验研究
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TD431

基金项目:

国家重点基础研究发展计划(973)资助项目(2014CB239206);国家自然科学基金青年基金资助项目(51404045);长江学者和创新团队发展计划资助项目(IRT13043)。


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

    针对现有前混合磨料射流系统不能实现磨料连续供给的问题,提出利用射流泵原理抽吸和混合磨料实现连续加料的新思路,即利用有压水从射流泵喷嘴以一定速度喷出而引起的负压场卷吸磨料进入射流泵内的混合腔,并与水混合后经喉管和扩散管进入高压胶管,最后经切割喷嘴加速后喷出,形成连续磨料水射流。为使系统性能最优,分析了连续加料系统的结构组成及工作原理,并设计了系统的结构与尺寸;运用数值模拟方法对影响连续加料与射流性能的主要因素——切割喷嘴与射流泵喷嘴面积比进行优化设计,分析了其对系统性能的影响规律,确定了其最优取值范围;通过室内压力测试、连续加砂及切割试验对系统性能进行了验证,结果表明,在合适的面积比结构下,该连续加砂系统在磨料入口能形成负压及足够的压力梯度,将磨料吸入并加速,且在切割喷嘴端仍然保留足够的静压转化为动能,实现前混合磨料水射流的连续高效作业。

    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.

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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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  • 收稿日期:2018-03-01
  • 在线发布日期: 2018-08-01
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