Simulation of flow field distribution of louvered windshield and research on influence factors of local wind resistance

In order to realize the remote and accurate control of air volume in Wangjialing coal mine, the louver air window with compressed air as the main power is developed.By controlling the rotation of the pneumatic motor, the louver can change the opening angle of the window leaf to realize the adjustment of the ventilation area of the louver.In this paper, Fluent software is used to simulate the distribution of air pressure, wind speed and flow field before and after the louver at the opening angles of 30°, 45°, 60°, 70° and 90°.Through numerical simulation, the ventilation resistance and local wind resistance of air window under different opening angles are obtained.Based on Bernoulli energy equation, the calculation formula of local wind resistance of the air window is derived.The wind resistance calculated by the formula is compared with that measured in coal mine.The results show that the influence of the air volume on the wind resistance is very small in turbulent state.The local wind resistance of the wind window is negatively exponentially related to its ventilation area.The maximum relative error between the measured wind resistance and the wind resistance calculated by the formula is 5.41%, and the corresponding absolute error is only 0.001 5 N·S²/m⁸.The local wind resistance of the air window calculated by the formula is accurate and can be used to guide the air volume adjustment of the air window in the coal mine.