无密闭辅扇通风是井下矿山用来进行风量调节的措施之一。由于不用设置密闭墙,安装方便、运行可靠、易于管理,且不妨碍通行,因此在我国冶金矿山被广泛采用。但迄今对它的理论研究还不完善,在实际应用中也存在着许多不合理的现象,没有充分发挥无密闭辅扇的效能。为此,作者对它进行了较深入的研究,提出了无密闭辅扇通风时的巷道风量、有效风压和引射器最优出口断面的计算公式。 Airtight fan ventilation without closed mine mine is used to adjust the air volume one of the measures. Because there is no need to set a closed wall, easy installation, reliable operation, easy to manage, and without prejudice to traffic, it is widely used in China’s metallurgical mines. But so far the theoretical research on it is not perfect, and there are many irrational phenomena in practical application, so it does not give full play to the effectiveness of airtight auxiliary fans. To this end, the author conducted a more in-depth study of it, and proposed the calculation formula of the tunnel air volume, the effective pressure and the outlet section of the ejector when the auxiliary fan is not closed.