采煤工作面局部风流雾化降温效果分析

摘要

为分析低温雾化喷淋对高温采煤工作面局部风流的降温效果,采用Eulerian-Lagrangian二相流描述方法,通过液滴与湿空气的双向耦合作用,对高温风流的降温效果进行了数值计算,计算结果表明:1次降温后,风流温度约有4℃的急剧降低,1排喷嘴的有效作用距离为10 m,10 m后,风流温度又逐渐升高1.5℃,总体上,回采面风流的温度呈现出阶跃性的上升趋势;拟合得到的风流降温效果随喷嘴流量呈负指数变化;液滴喷射角在70°～90°范围时,降温效果较明显,而细水雾的高压雾化喷嘴能明显提高降温效果.%In order to analyze the effect of atomization cooling in the partial high-temperature mining face, a describing technique of two-phase flow called Eulerian-Lagrangian method is adopted to simulate the effect of atomization cooling, and the coupling of droplet and wet air is taken into account in the process of calculation.The results of the numerical calculation show that the temperature of flow declines 4 ℃ rapidly after once atomization cooling, which satisfies the demand of cooling in mine.And the effective distance of every row of atomizers is 10 m in the direction of caving face.The temperature of flow goes up 1.5 ℃ after cooling.As a whole,the temperature of flow in caving face goes up statutorily.The cooling effect changes with flux of atomizer as a format of minus exponent.The effect of atomization cooling is obvious in the range of 70°～90° for the spraying angle, and a high pressure mist atomizer can improve the effect of atomization cooling distinctly.