东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2015, Vol. 36 ›› Issue (10): 1466-1471.DOI: 10.3969/j.issn.1005-3026.2015.10.022

• 资源与土木工程 • 上一篇    下一篇

煤层水力割缝自吸磨料喷嘴特性与参数

张欣玮1,2， 卢义玉1,2， 汤积仁1,2， 周哲1,2   

  1. (1. 重庆大学 煤矿灾害动力学与控制国家重点实验室， 重庆400030；2. 重庆大学 复杂煤气层瓦斯抽采国家地方联合工程实验室， 重庆400030)
  • 收稿日期:2014-06-20 修回日期:2014-06-20 出版日期:2015-10-15 发布日期:2015-09-29
  • 通讯作者: 张欣玮
  • 作者简介:张欣玮(1991-)，女，河南渑池人，重庆大学博士研究生； 卢义玉(1972-)，男，湖北京山人，重庆大学“长江学者奖励计划”特聘教授，博士生导师.
  • 基金资助:
    国家重点基础研究发展计划项目(2014CB239206)； 国家自然科学基金青年基金资助项目(51374258)； 长江学者和创新团队发展计划项目(IRT13043)； 国家自然科学基金资助项目(51104191)； 重庆市博士后科研人员特别资助项目(Xm2014036).

Parameters and Characteristics of Self-Priming Abrasive Jet Nozzle for Cutting Coal Seam

ZHANG Xin-wei1,2，LU Yi-yu 1,2，TANG Ji-ren1,2，ZHOU Zhe 1,2   

  1. 1. State Key Laboratory of Coal Mine Disaster Dynamics and Control， Chongqing University， Chongqing 400030， China; 2. National & Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam， Chongqing University， Chongqing 400030， China.
  • Received:2014-06-20 Revised:2014-06-20 Online:2015-10-15 Published:2015-09-29
  • Contact: ZHANG Xin-wei
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摘要： 针对煤矿纯水射流割缝遇硬煤失效，而磨料射流割缝技术难以实现磨料连续添加等问题，基于引射原理，采用前后双喷嘴结构，设计出一种自吸式磨料射流割缝喷嘴，可以连续吸入割缝产生的煤粒形成磨料射流，提高割缝能力.通过液固两相数值模拟，发现煤粒在喷嘴内经历了3个加速阶段:吸入口加速段、混合腔加速段和后喷嘴加速段.以提高吸入量和最终煤粒的速度为指标，得到喷嘴的最优结构:前喷嘴直径为3mm，后喷嘴直径为5mm，后喷嘴长度15mm.对比割缝实验结果表明，自吸式磨料射流割缝喷嘴的割缝效率较传统割缝喷嘴明显提高.

关键词: 煤层割缝, 自吸式, 磨料射流, 喷嘴, 两相流

Abstract: High-pressure water jet becomes invalid in cutting hard coal seam， and abrasive jet cutting technology is difficult to achieve continuous addition of abrasives. In order to overcome these difficulties， a self-priming abrasive jet nozzle using the forward and backward nozzle structure was designed on the basis of the principle of ejector. This nozzle can achieve continuous inhalation of coal particles produced by slotting to form abrasive jet， with the slotted capacity improved. By simulating the two-phase liquid-solid interaction， it was found that coal particles in the nozzle experience three acceleration stages at intake， mixing chamber and nozzle， respectively. According to the volume of particles and the final velocity of the particles， the most optimal nozzle structure was obtained: the front nozzle diameter is 3mm， the back nozzle diameter is 5mm， and the length of the back nozzle is 15mm. The comparison of the experiments results showed that the slotting efficiency of the self-priming abrasive nozzle was improved significantly compared to that of the traditional cutting seam.

Key words: coal seam cutting, self-priming, abrasive jet, nozzle, two-phase flow

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