水力冲孔煤水管道输送流动特性仿真研究

Simulation study on flow characteristics of hydraulic punching coal water pipeline transportation

为了实现底抽巷水力冲孔排出煤水混合物的高效管道输送,基于计算流体动力学构建煤水混合物的管道输送仿真模型,分析入口流速、煤粒粒径和输送管道直径等输送条件对煤水混合物管道输送流动特性的影响规律。研究结果表明,入口流速较低时易发生煤粒沉积现象,随着煤粒粒径的增大,出口截面处的煤粒相体积浓度分布有逐渐向管道底部扩散的趋势,最大流速分布中心在管道出口截面中不断上移。同时,随着管道直径的增大,煤粒相的分层现象更加明显,靠近管道底端区域的体积浓度显著增加。研究为底抽巷水力冲孔煤水混合物高效远距离管道输送的运行参数调控和设备选型提供了依据。

In order to realize the efficient pipeline transportation of coal-water mixture discharged through hydraulic punching in bottom extraction roadways,the pipeline transportation simulation model of coal-water mixture was constructed based on computational fluid dynamics.The influence of transportation conditions such as inlet flow velocity,coal particle size and transportation pipe diameter on the flow characteristics of coal water mixture pipeline transportation was solved and analyzed.The results show that the coal particle deposition is easy to occur when the inlet flow velocity is low.With the increase of coal particle size,the volume concentration distribution of coal particle phase at the outlet section has a trend of gradually diffusing to the bottom of the pipeline,and the distribution center of maximum flow velocity moves upward in the outlet section of the pipeline.At the same time,as the diameter of the transportation pipe increases,the stratification phenomenon of the coal particle phase becomes more obvious,and the volume concentration near the bottom of the pipeline increases significantly.This provides a basis for the operation parameter regulation and equipment selection of efficient long-distance pipeline transportation of coal-water mixture discharged by hydraulic punching in bottom extraction roadways.