摘要
高压水射流割缝增透技术是一项新型的瓦斯抽采技术,其中喷嘴是切割的执行元件。影响喷嘴切割性能的结构因素有喷嘴稳定段长度、收缩角和直线段长度,3因素相互制约,且存在一个最优值。应用正交设计的方法对不同参数组合下喷嘴出口流场进行了模拟,模拟结果表明:稳定度长度为0 mm、收缩角为30°、直线段长度为9 mm的割缝喷嘴具有最佳的喷射性能。在室内对其切割性能进行测试,结果表明:优化后的喷嘴切割能力为原喷嘴的1.5倍。
Technology of slotting and improving coal seam permeability with high pressure water jet is an effective method to improve gas exhausting rate, where the nozzle is the actuator of the cutting. The structural factors affecting the nozzle cutting performance are the length of stability section, the contraction angle and the length of the straight section, the three factors are mutually constrained, and an optimal value should exist. The orthogonal design method was used to simulate the flow field at nozzle outlet under different parameter combinations in this paper, and the simulation results show that the slotting nozzle with the stability length of 0 mm, contraction angle of 30 ° and straight section length of 9 mm has the best injection performance. The cutting performance was tested in laboratory, and the results show that the cutting ability of optimized nozzle was 1.5 times that of the original nozzle.
作者
沈华建
SHEN Huajian(Colleage of Source and Safety,Chongqing University,Chongqing 400030,China;China Construction Third Engineering Design Bureau Co.,Ltd.,Wuhan 430072,China)
出处
《煤矿安全》
CAS
北大核心
2020年第4期10-13,共4页
Safety in Coal Mines
基金
长江学者和创新团队发展计划资助项目(IRT17R112)。
关键词
瓦斯抽采
水射流割缝
喷嘴结构
数值计算
正交设计
gas extraction
water jet slotting
nozzle structure
numerical calculation
orthogonal design
作者简介
沈华建(1994—),湖北黄冈人,重庆大学在读硕士研究生,研究方向为高压水射流破岩和非常规天然。
