不同喷雾压力下雾化场气液两相流数值仿真

Numerical Simulation of Gas-liquid Two-phase Flow of Atomizing Field Under Different Spraying Pressure

为解决煤矿喷雾降尘效率低和喷雾用水量大易造成巷道水害问题,依据气液两相流理论,应用Fluent软件对雾滴在不同喷嘴压力作用下粒径分布和运移规律进行数值模拟,得到雾粒浓度和粒径分布情况。研究表明:喷雾压力影响雾粒的分布范围。压力过大,雾粒在巷道内的分布面积逐渐减小。同一喷嘴压力下雾粒粒径分布不均匀,在横截面上呈现中间粒径小,两边粒径大的规律。当喷雾压力为3 MPa时,雾粒的分布利于降尘且距喷嘴2.8 m处雾化效果最好。

To solve the problems of low dust suppression efficiency by spraying in coal mine and easy water damage caused by larger spraying water consumption in roadway,based on the theory of gas-liquid two-phase flow,particle size distribution and migration laws are numerically simulated by FLUENT software under different spraying pressure,we obtain the fog droplets concentration and particle size distribution.The simulation results show that spraying pressure influences the distribution range of droplets.The distribution areas of droplets in the roadway gradually decrease if the spraying pressure is too large.The particle size distribution of fog droplets at the same spraying pressure is not even and it appears that the smaller fog droplets are in the middle,while the larger droplets are on the both sides of the cross section.When the spraying pressure is 3 MPa,the distribution of droplets is good for reducing the dust and it has the best effect when the distance is 2.8 m away from the nozzle.