正确确定排尘风流参数,对矿井防尘工作具有重要意义。但这方面的理论研究工作还做得很不充分,对最小排尘风速的理解也不一样。例如,通常把最小排尘风速用下式来表达: v_(min)>v_f (1) 式中:v_(min)—巷道中的平均最小排尘风速,米/秒; v_f—静止空气中尘粒的自由沉降速度,米/秒。其实,这只能适用于垂直巷道的情况,它说明一定粒度的矿尘为上行或下行风流所排除。同时式中的自由沉降速度v_f是从矿尘为球形的条件下来确定的,显然它的实际意义不大。为了说明水平巷道中最小有效排尘风速参数,我们首先来研究平巷中的风流特性。井巷是一种具有粗糙壁的风道,风流一 Correctly determine the dust flow parameters, mine dust prevention is of great significance. However, theoretical research in this area is still inadequate, and the understanding of the minimum dust velocity is not the same. For example, the minimum dust velocity is usually expressed as: v_ (min)> v_f (1) where: v_ (min) - average minimum wind speed in the roadway in meters / second v_f- dust in still air Free settling speed of grain, m / s. In fact, this can only be applied to the case of vertical roadway, which shows that a certain degree of granularity of dust for the up or down the romantic flow excluded. In the same time, the free settlement velocity v_f is determined from the condition that the ore dust is spherical. Obviously, it has little practical significance. In order to illustrate the minimum effective dust removal velocity parameters in horizontal tunnels, we first study the wind flow characteristics in the drift. Lane is a kind of rough wall of the wind tunnel, Merry one