一、摘要当主提升井用作回风井的时候,风峒通常在低于地面某一定距离与主提升井井筒相交,空气流在交叉处上部的竖井头部出现涡流现象。这样,由于空气流在交叉处的分离,而造成较大的压力损失和流动的不稳定性。空气流动的不稳定性能影响风机性能并能造成试验的困难。为了罐笼通过,井筒的大部分面积必须保持畅通, Summary When the main hoistway is used as a return air well, the wind 相 usually intersects with the main lift shaft at some distance below the ground. The air flow swirls at the shaft head at the top of the intersection. This results in greater pressure loss and flow instability due to the separation of air flow at the intersection. The instability of air flow can affect fan performance and can cause difficulties in testing. For the cage to pass, most of the area of ​​the wellbore must remain open,