Vol. 44 No. 1 Feb.2017
矿业安全与环保
MINING SAFETY & ENVIRONMENTAL PROTECTION
文章编号：10084495(2017)01002804
第44卷第1期 2017年2月
掘进巷道壁面粗糙度对受限贴附紊动射流的影响
龚晓燕，李根，焦婉莹，莫金明，张永强，薛馨禹
（西安科技大学机械工程学院，陕西西安710054）
摘要：由于巷道壁面粗糙度对贴附紊动射流起始段与主体段有较大影响，根据贴附射流理论，通过 FLUENT软件数值模拟，分析在巷道壁面粗糙度厚度不同及粗糙度不均匀的情况下，贴附紊动射流运动特征及对掘进巷道内通风流场的影响。结果表明：巷道壁面粗糙度厚度对受限贴附紊动射流的起始段影响较小，对主体段影响较大，随着粗糙度厚度增大，主体段的轴心速度减小越快，低风速区厚度增大，在回流区易形成涡流区；随着粗糙度不均匀性增加，巷道内涡流区增大。数值模拟结果与理论分析结果相符，为研究掘进巷道风流传递过程、粉尘与瓦斯运移规律等提供了理论基础。
关键词：掘进巷道；壁面；粗糙度厚度；案动射流；通风流场；数值模拟
中图分类号：TD724*.4
文献标志码：A
网络出版时间：2017-02-0710：01
网络出版地址：http：//www.cnki.ne/kcms/detail/50.1062.TD.20170207.1001.010.html
Influence of WallRoughness onRestricted Wall-attached Turbulent
JetinExcavationRoadway
GONGXiaoyan,LI Gen,JIAO Wanying,MO Jinming,ZHANG Yongqiang,XUEXinyu(School of Mechanical Engineering ,Xi' an University of Science and Technology,Xi'an 710054, China)
Abstract: The wall roughness of the excavation roadway has great influence on the initial section and the main section of the restricted wallattached turbulent jet. In this paper, analysis was carried out on the the characteristics of the attached turbulent jet movement and its influence on the air flow field in the excavation roadway under the conditions of diffemt thickness of toughness and uneven roughness of the roadway wall according to the restricted wallattached jet theory and by numerical simulation with FLUENT software, The results showed that the thickness of toughness of the roadway wall had smaller influence on the initial section of the restricted wallattached turbulent jet and grealer influence on its main section,and with the increase of the thickness of toughness,the axial velocity of the main section quickly decreased and the thickness of the low speed region increased, the vortex area was easily formed in the recirculation zone;with the increase of the nonuniformity of the roughness,the vortex area in the roadway increased. The numerical simulation results are consistent with the theoretical results,which provided theoretical basis for studying the airflow transfer process and the dust and gas migration rule in the excavation roadway
Keywords: excavation roadway : wall;thickness of roughness ;turbulent jet; ventilation flow field ;numerical simulation
掘进巷道的压入式通风风简射向掘进工作面的风流，由于受到巷道壁面及工作面端头的限制，射流风流产生回流，其流动特性与自由射流不同，其射流的流场形态十分复杂1)。掘进通风由于不能采用矿井主要通风机的全风压通风，而通常采用局部通风机强制通风，其影响环节比较多[2]。掘进巷道受
收稿日期：2016-06-04;2016-12-26修订
作者简介：粪晓燕（1966—），女，甘肃临洗人，工学博士，教授，主要研究方向为矿并通风安全。E-mail：gongxymail@
163.com。· 28 · 万方数据
限贴附射流场的状态不仅与巷道风筒出风口的位置、风筒简直径、出口风速、风筒出口到工作面的距离等特征参数有关，而且与巷道壁面粗糙度也有关系(3-4)
王海桥等提出巷道壁面粗糙度对巷道附壁射流有一定的影响，但并没有进行深入的研究[3}；罗永豪等采用实验室模拟风洞试验研究壁面粗糙度对巷道壁面附近的低风速区域的影响，得出了低风速区域厚度随着巷道壁面粗糙度厚度的增大而增大"]。通过查阅大量文献可看出，巷道壁面粗糙度对受限贴附紊动射流以及低速风区有较大影响。笔者为了揭