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黄金科学技术 ›› 2022, Vol. 30 ›› Issue (5): 743-752.doi: 10.11872/j.issn.1005-2518.2022.05.033

• 采选技术与矿山管理 • 上一篇    下一篇

双机并联空气幕射流角度对巷道风流的影响

马恒1,2(),高嘉毅1,2(),李世虎1,2,高科1,2   

  1. 1.辽宁工程技术大学安全科学与工程学院,辽宁 葫芦岛 125000
    2.矿山热动力灾害与防治教育部重点实验室,辽宁 葫芦岛 125000
  • 收稿日期:2022-02-28 修回日期:2022-05-16 出版日期:2022-10-31 发布日期:2022-12-10
  • 通讯作者: 高嘉毅 E-mail:maheng@163.com;15047332169@163.com
  • 作者简介:马恒(1972-),男,内蒙古乌兰察人,教授,博士生导师,从事矿山通风安全和安全信息工程研究工作。maheng@163.com
  • 基金资助:
    国家自然科学基金项目“煤矿综放采空区二域流场理论与仿真研究”(52074148)

Influence of Jet Angle of Twin Parallel Air Curtains on the Tunnel Airflow

Heng MA1,2(),Jiayi GAO1,2(),Shihu LI1,2,Ke GAO1,2   

  1. 1.College of Safety Science and Engineering, Liaoning Technology University, Huludao 125000, Liaoning, China
    2.Key Laboratory of Mine Thermodynamic Disaster and Control of Ministry of Education, Huludao 125000, Liaoning, China
  • Received:2022-02-28 Revised:2022-05-16 Online:2022-10-31 Published:2022-12-10
  • Contact: Jiayi GAO E-mail:maheng@163.com;15047332169@163.com

摘要:

为研究双机并联循环型空气幕在矿井巷道中拦截风流的效果,对空气幕射流角度和风机全压进行分析。以某金属矿巷道为工程背景,利用Fluent数值模拟技术,建立原巷道等比例物理模型,并选用K45-6型轴流式风机对原巷道内部的流场进行数值模拟,从隔断压差、漏风量和阻风率3个方面进行分析。结果表明:风机全压为定值时,随着空气幕射流角度的增大,隔断压差与阻风率呈现先增大后减小的变化趋势,漏风量呈现先减小后增大的变化趋势,随着空气幕射流角度的增大气幕汇合逐渐形成完整风幕,但当空气幕射流角度继续增大时,受到来自巷道横向压力的作用,空气幕不能有效阻隔风流;当射流角度过小或风机全压过大时会发生引射风流现象,此时双机并联空气幕将巷道下游空气引射到上游,不再拦截巷道风流。综合分析,在巷道内设置双机并联空气幕控风效果明显,巷道空气幕最优组合为风机全压叶片角度为30°且射流角度为30°。

关键词: 空气幕, 射流角度, 隔断压差, 阻风率, 流场分析, 数值模拟

Abstract:

Most of the metal mines in China are combined vertical shafts and ramp roads.Under the joint action of multiple factors such as long-term ground pressure and frequent traveling,the dampers are severely damaged and extremely inconvenient to manage and maintain.In the context of intelligent ventilation development,the traditional manual or semi-manual airflow control measures can hardly meet the requirements of intelligent ventilation in mines,and the control of airflow can’t be realized or can’t achieve the expected effect in the special conditions of the tunnel.Mining air curtain is a new type of airflow control technology that can achieve intelligent control of airflow in more complicated conditions in the tunnel without affecting the transportation of equipment and the work of personnel in the tunnel.To investigate the effect of twin parallel air curtains in a non-coal tunnel to intercept the wind flow,a metal mine project tunnel in Gansu Province was taking as the background,based on Fluent numerical simulation technology,the K45-6 axial flow fan was selected,by changing the fan full pressure and jet angle to establish different mathematical and physical models of the original tunnel,the flow field inside the original tunnel for numerical simulation,according to the simulation results of the twin parallel air curtains on the tunnel flow field,the impact analysis was carried out based on the simulation results.The analysis was carried out in three aspects,namely differential pressure,air leakage,and air blockage rate.The main conclusions of this study include:(1)When the full pressure of the fan is a constant value,as the air curtain jet angle increases,the differential pressure and wind resistance show a trend of first increasing and then decreasing,and the differential pressure and wind resistance increase significantly when the jet angle is 5°~30°,the differential pressure and wind resistance increase significantly,and the air curtain gradually converges into a complete air curtain.When the jet angle reaches 30°,the differential pressure and wind resistance reach the maximum value,and the most complete air curtain is formed.But the rising trend in 15°~30° is flatter than 5°~15°.When the jet angle continues to increase to 45°,the differential pressure and wind resistance rate drop significantly.When the jet angle continues to increase to 60°,the differential pressure and wind resistance rate are the lowest.As the jet angle continues to increase,the lateral pressure from the tunnel can’t effectively block the wind flow.(2)The air leakage volume shows a trend of decreasing and then increasing as the jet angle increases,and the air leakage volume decreases more obviously when the jet angle increases from 5° to 15°.When the jet angle increases to 60°,the isolation capacity is the worst.(3)When the jet angle is too small or fans’ full pressure is too large,the phenomenon of induced airflow will occur,then the double machine parallel circulation type air curtain will be downstream of the tunnel air to the upstream,no longer can it intercept the tunnel wind flow.According to comprehensive analysis,obvious effect of air control can be obtained by setting double parallel circulating air curtain in the roadway,and the optimal parameter combination of double machine parallels circulation-type air curtain is that the fan full pressure blade angle is 30° at the same time jet angle is 30°.

Key words: air curtain, jet angle, partition pressure difference, wind resistance, flow field analysis, numerical simulation

中图分类号: 

  • TD724

图1

循环型双机并联空气幕实际流动模型"

图2

空气幕模型网格划分"

图3

巷道模型网格划分"

表1

数值模拟条件设定"

Modle(计算模型)Define(模型确定)
Solve(求解器)Segregated(非耦合求解)
Viscous Modle(湍流模型)K-epsilon(K-ε模型)
Specious Modle(差分方程)Implicit(隐式算法)
Speed(速度属性)Absolute(绝对速度)
Time(时间)Steady(稳态)

表2

边界条件设置"

设置项目边界条件类型
巷道壁、空气幕壁壁面(wall)
风机入口Fan边界(fan)
空气幕出口内部面(interior)
巷道入口速度入口(velocity inlet)
巷道出口压力出口(pressure outlet)

图4

风机特性曲线"

表3

巷道实测数据"

巷道名称断面面积/m2叶片角度/(°)射流角度/(°)压差/Pa模拟压差/Pa
主斜空气幕上侧14.694303052.749.6
主斜空气幕下侧14.4863030
1000空气幕上侧14.830353058.658.3
1000空气幕下侧14.3263530

图5

风机叶片角度为25°时的压力云图"

图6

风机叶片角度为35°时的压力云图"

图7

隔断压差图"

图 8

叶片角度为25°时的速度云图"

图 9

叶片角度为25°时的速度矢量图"

图10

漏风量折线图"

图11

阻风率折线图"

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