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Gold Science and Technology ›› 2022, Vol. 30 ›› Issue (5): 743-752.doi: 10.11872/j.issn.1005-2518.2022.05.033

• Mining Technology and Mine Management • Previous Articles     Next Articles

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

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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

CLC Number: 

  • TD724

Fig.1

Actual flow model of circulating twin parallel air curtains"

Fig.2

Grid division of air curtain model"

Fig.3

Grid division of roadway model"

Table 1

Numerical simulation conditions setting"

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）

Table 2

Boundary conditions setting"

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）

Fig.4

Fan characteristic curves"

Table 3

Roadway measurement data"

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

Fig.5

Cloud image of pressure when fan blade angle is 25°"

Fig.6

Cloud image of pressure when fan blade angle is 35°"

Fig.7

Diagram of partition pressure difference"

Fig.8

Cloud image of velocity when fan blade angle is 25°"

Fig.9

Vector diagram of velocity when fan blade angle is 25°"

Fig.10

Line chart of air leakage rate"

Fig.11

Line chart of air flow rate"

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