综放工作面粉尘浓度空间分布规律的数值模拟及其应用

Numerical simulation and its application of dust concentration spatial distribution regularities in fully-mechanized caving face

针对粉尘采样器测尘法不能全面反映工作面作业空间粉尘浓度的缺点,用数值模拟的方法对综放工作面粉尘浓度的三维分布规律进行研究。为此,根据综放工作面气体-粉尘流动的特性,运用颗粒相的动力学理论,推导了颗粒相应力的表达式,实现了求解粉尘浓度空间分布规律的k-ε-Θ-kp双流体封闭方程组的数学建模。采用基于同位网格的SIMPLE算法,利用Fluent软件对综放工作面粉尘浓度空间分布规律进行了数值模拟。根据模拟结果指导综放液压支架喷雾降尘装置的优化设计,取得了很好的降尘效果。

For the fault of dust sampling device of not reflecting spatial dust concentration in workface fully,numerical simulation was adopted to study on dust concentration three-dimensional distribution regularities in fully-mechanized caving face.According to the gas-dust flow characteristics in fully-mechanized caving face,kinetic theory of particle phase was applied to deduce the expressions of stress about particle phase,obtaining the closed equations of two-fluid k-ε-Θ-kp model suitable for solving the dust concentration spatial distribution regularities.Numerical solution of gas-particle two-phase flow was put forward based on collocated grid SIMPLE algorithm.Moreover,numerical simulation of dust concentration in fully-mechanized caving face was carried out by using Fluent software.Finally,the optimizational design of dust prevention equipment by water-cloud system of powered roof support was improved according to the simulation result,acquiring fine dedusting effect.