大倾角综放工作面风流场及粉尘场的数值模拟

Numerical Simulation of Ventilation Flow Field and Dust Field in Fully Mechanized Caving Face with Large Dip Angle

基于气固两相流动理论,结合大倾角综放工作面的实际特点,建立了大倾角综放工作面仿真模型。以采煤机割煤过程中的粉尘运动为研究对象,利用Fluent软件解算得到风流场、速度场和粉尘浓度场模拟结果:大倾角综放工作面倾角大,风流紊乱,风速较大,粉尘所受到的空气浮力大于粉尘自身重力,在采煤工作面漂移的时间延长,大量粉尘会随工作面主导风流向下风侧扩散,且其扩散的距离和对下风侧的影响范围大于近水平煤层或缓倾斜煤层。

Based on the theory of gas-solid flow and in combination of the actual characteristics of the fully mechanized caving face with large dip angle, a simulation model of the fully mechanized caving face with large dip angle was established. In this paper, the dust movement in the process of coal cutting was taken as the study object and the Fluent software was applied to the numerical simulation of the air stream field, the velocity field and the dust concentration field. Simulation results showed that the air current was very complicated and the air velocity was so fast in such fully mechanized caving face with large dip angle, the floating force acted on coal dust was greater than its own gravity, the floating time of coal dust in the face extended, most of dust would diffuse towards the downward flow with the main air flow in the face, and its diffusion distance and the range of its influence on the downwind side were greater than that in the fully mechanized caving face in fiat seam or gentle inclined seam.