Influence of Jet Angle of Twin Parallel Air Curtains on the Tunnel Airflow
Received date: 2022-02-28
Revised date: 2022-05-16
Online published: 2022-12-10
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°.
Heng MA , Jiayi GAO , Shihu LI , Ke GAO . Influence of Jet Angle of Twin Parallel Air Curtains on the Tunnel Airflow[J]. Gold Science and Technology, 2022 , 30(5) : 743 -752 . DOI: 10.11872/j.issn.1005-2518.2022.05.033
| null | Gao R， Li A G， Lei W J，et al，2012.Study of a proposed tunnel evacuation passageway formed by opposite-double air curtain ventilation［J］.Safety Science，50（7）：1549-1557. |
| null | Gupta S， Pavageau M， Elicer-Cortés J C，2006.Cellular confinement of tunnel sections between two air curtains［J］.Building and Environment，42（9）：3352-3365. |
| null | Hu L H， Zhou J W， Huo R，et al，2008.Confinement of fire-induced smoke and carbon monoxide transportation by air curtain in channels［J］.Journal of Hazardous Materials，156（1/2/3）：327-334. |
| null | Liu Chengmin， Liu Hongfang， Wang Haining，et al，2015.Renovated method for choosing the mining air curtain type via a 3-D simulation mining ventilation system software［J］.Journal of Safety and Environment，15（2）：68-71. |
| null | Luo N， Li A G， Gao R，et al，2013.An experiment and simulation of smoke confinement and exhaust efficiency utilizing a modified opposite double-jet air curtain［J］.Safety Scien-ce，55：17-25. |
| null | Severino G， Elicer-Cortés J C， Fuentes A，2013.Characterization of a diffusion flame inside a scale tunnel using double stream-twin jets air curtains［J］.Fire Safety Journal，62（Part. C）：264-271. |
| null | Tao Liangliang， Zeng Yanhua， Liu Zhenhan，et al，2021.Study on influence of air curtain on temperature and flow field of subway tunnel fires［J］.Chinese Journal of Safety Science，31（7）：157-163. |
| null | Vittori F， Rojas-Solorzano L， Pavageau M，2012.Response surface methodology for analysis of an air curtain used as emergency ventilation system in a tunnel fire［J］.Chemical Engineering Transactions（CET Journal），26：399-404. |
| null | Wang Haining，2005.Air Curtain Theory and Applications in Mines［D］.Changsha：Central South University. |
| null | Wang Haining，2012.Cavern type airflow control technology of mine［J］.Journal of Chongqing University，35（5）：126-131. |
| null | Wang Haining， Wang Huaping， Xie Jinliang，2007.Numerical simulation and analysis of airflow field in air curtain［J］.Mining Research and Development，（6）：75-77. |
| null | Wang Huaping，2008.Numerical Simulation and Research of Mining Air Curtain［D］.Ganzhou：Jiangxi University of Technology. |
| null | Wang Pengfei， Feng Tao， Liu Ronghua，2010.Theoretical study on dust-isolating of air curtain at fully-mechanized face［J］.Journal of Safety and Environment，59（5）：146-149. |
| null | Wang Pengfei， Liu Ronghua， Tang Meng，et al，2015.Theoretical and experimental study on the dust isolation of rotating air blind at the fully-mech-anized working face［J］.Safety and Environment Journal，90（6）：68-72. |
| null | Wu Xiaoming，2014.Application of the twin-jet air curtain in tunnel fires［J］.Modern Transportation Technology，11（3）：44-47. |
| null | Xu Zhuyun， Chen Rongce，1988.The effective pressure balance principle of mine air curtain and its application［J］.Gold，（1）：4-9. |
| null | Xu Zhuyun， Chen Rongce，1989.Design calculation of wide mouth large air volume air curtain for mining［J］.Gold，（1）：27-31，39. |
| null | Zhao Ling， Jiang Zhong’an，2011.Numerical simulation on influence of cyclic mine air curtain outlet velocity on effectiveness of obstructing airflow［J］.Mining Safety and Environmental Protection，38（4）：18-20，41，93. |
| null | Zhao Ling， Tang Minkang， Jiang Xiaohua，2015.Analysis on influence to airflow obstructing effect in mine tunnel by wind-supply angle of cyclic air curtain［J］.China Science and Te-chnology of Safety Production，11（3）：34-39. |
| null | Zhou Fubao， Wei Lianjiang， Xia Tongqiang，et al，2020.Principle，key technology and preliminary realization of mine intelligent ventilation［J］.Journal of Coal，45（6）：2225-2235. |
| null | 刘成敏，刘红芳，王海宁，等，2015.基于矿井通风三维仿真系统软件的矿用空气幕选型方法［J］.安全与环境学报，15（2）：68-71. |
| null | 陶亮亮，曾艳华，刘振撼，等，2021.空气幕对地铁隧道火灾温度及流场的影响研究［J］.中国安全科学学报，31（7）：157-163. |
| null | 王海宁，2005.矿用空气幕理论及其应用研究［D］.长沙：中南大学. |
| null | 王海宁，2012.硐室型矿井风流调控技术［J］.重庆大学学报，35（5）：126-131. |
| null | 王海宁，王花平，谢金亮，2007.空气幕内气流场的数值模拟与分析［J］.矿业研究与开发，（6）：75-77. |
| null | 王花平，2008.矿用空气幕的数值模拟与研究［D］.赣州：江西理工大学. |
| null | 王鹏飞，冯涛，刘荣华，2010.综采工作面空气幕隔尘理论研究［J］.安全与环境学报，59（5）：146-149. |
| null | 王鹏飞，刘荣华，汤梦，等，2015.综采工作面旋转风幕隔尘理论及试验研究［J］.安全与环境学报，90（6）：68-72. |
| null | 吴晓明，2014.双喷空气幕在隧道火灾中的应用［J］.现代交通技术，11（3）：44-47. |
| null | 徐竹云，陈荣策，1988.矿山空气幕的有效压力平衡原理及其应用［J］.黄金，（1）：4-9. |
| null | 徐竹云，陈荣策，1989.矿用宽口大风量空气幕的设计计算［J］.黄金，（1）：27-31，39. |
| null | 赵玲，蒋仲安，2011.循环型矿用空气幕出口风速对隔断风流效果影响的数值模拟［J］.矿业安全与环保，38（4）：18-20，41，93. |
| null | 赵玲，唐敏康，江小华，2015.循环型空气幕送风角度对隔断巷道风流效果影响的分析［J］.中国安全生产科学技术，11（3）：34-39. |
| null | 周福宝，魏连江，夏同强，等，2020.矿井智能通风原理、关键技术及其初步实现［J］.煤炭学报，45（6）：2225-2235. |
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