基于动网格井巷活塞风影响因素的数值模拟研究

摘要

This paper is aimed to study the influence of different factors on the laneway piston wind , under the influence factors of tramcar speed ,laneway wind speed and blockage ratio ,there are four simulation schemes with the application of control variable method ,and the numerical simulation of airflow distribution of laneway by k‐ε turbulence model based on dynamic mesh is proposed .The numerical simulation results show that k‐εturbulence model and dynamic mesh method could properly simulate the airflow distribution and tramcar operation ;the piston wind influence range become larger with the increase of tramcar speed ;when airflow and tramcar move in the same direction ,the piston wind effect is less evident and the influence on laneway ventilation is smaller with the increase of wind speed ;when airflow and tramcar move in the opposite direction ,the differential pressure between the tramcar front and rear is greater ,airflow turbulence is more obvious ,ventilation resistance and the influence on laneway ventilation grow larger with the increase of wind speed ;the larger blockage ratio ,the more obvious the piston wind effect ,and the disturbance to laneway ventilation grows larger .%为了研究不同因素对井巷活塞风的影响，运用控制变量法，选取了矿车速度 Vc 、巷道风速V0、阻塞比а三种影响因素，采用基于动网格技术的标准 k－ε双方程湍流模型对巷内气流组织进行数值模拟，得到了不同因素对巷内气流组织影响的变化规律。研究结果表明：随着车速的提高，巷内活塞风效应和影响效力和范围增大；当风流与矿车同向时，随着风速增大活塞风效应越不明显，对矿井通风影响越小；当风流与矿车反向时，随着风速增加车头与车尾压差、风流紊乱程度、通风阻力均变大，对通风效果影响较大；活塞风效应随着阻塞比的提高越来越明显，对巷内通风干扰变大。