煤体相似材料高压气射流参数优化及冲蚀特性分析  

Optimization of high-pressure air jet parameters and analysis of erosion characteristics for similar materials in coal bodies

作　　者：马恒[1,2] 宫正 高科[1,2] 宋鑫 MA Heng;GONG Zheng;GAO Ke;SONG Xin(School of Safety Science and Engineering,Liaoning University of Technology,Huludao 125105,China;Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education,Huludao 125105,China;Mine Safety Technology Branch of China Coal Research Institute,Beijing 100083,China)

机构地区：[1]辽宁工程技术大学安全科学与工程学院,辽宁葫芦岛125105 [2]矿山热动力灾害与防治教育部重点实验室,辽宁葫芦岛125105 [3]煤炭科学技术研究院有限公司安全分院,北京100083

出　　处：《煤矿安全》2023年第10期8-15,共8页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(52074148)。

摘　　要：为了有效避免水力化射流技术可能存在的水封抑制瓦斯解吸和降低煤层渗透率的缺陷,基于已有的气射流研究基础,采用理论分析和实验室实验等研究手段,对高压气射流的冲孔特性及射流参数组合下冲孔破煤规律进行了分析研究。结果表明:影响实验结果指标的3个因素中,射流压力的影响最大,冲击靶距次之,喷嘴规格对实验结果影响最小;实验范围内最优射流参数组合为射流压力12 MPa,冲击靶距30 mm,喷嘴规格3.5马赫数;射流冲蚀效果随着射流压力的增加不断增加,当射流压力达到10 MPa时,试件发生贯穿,进一步提升至12 MPa时,试件发生破碎;射流冲蚀存在最优冲击靶距,该靶距条件下,射流冲蚀效果最佳,一般为6~7倍喷嘴直径;喷嘴规格对冲蚀实验效果影响不大,随着喷嘴规格的增加,冲蚀效果趋于恒定。In order to effectively avoid the possible drawbacks of water seal inhibiting gas resolution and reducing coal seam permeability,based on the existing air jet research foundation,theoretical analysis and laboratory experiments were used to analyze and study the punching characteristics of high-pressure air jets and the law of punching and breaking coal under the combination of jet parameters.The results show that,among the three factors affecting the experimental results,the jet pressure has the greatest influence,the impact target distance is second,and the nozzle size has the least influence on the experimental results;the optimal combination of jet parameters in the experimental range is 12 MPa,30 mm impact target distance and 3.5 Mach number nozzle size.The effect of jet punching increases with the increase of jet pressure,when the jet pressure reaches 10 MPa,the specimen penetrates,and when it is further increased to 12 MPa,the specimen is broken;there is an optimal impact target distance for jet punching,and the jet punching effect is the best under this target distance,which is generally 6-7 times the nozzle diameter;the nozzle size has little effect on the effect of punching experiments,and the punching effect tends to be constant.

关 键 词：气射流 冲孔特性 射流参数 喷嘴规格 冲蚀效果 

分 类 号：TD712[矿业工程—矿井通风与安全]