本文中提出了当空气幕的初投资和运行费用最小时,确定空气耗量比的关系式。空气幕乃是从一个或者两个窄长条缝流出的气流(见图)。当空气幕气流通过打开的洞口时,引射室外空气G_H和室内空气G_n。在室外和室内压力差的作用下,气流可以复盖整个洞口,并部分进入室内(图a) This article proposes a formula for determining the ratio of air consumption when the initial investment and operating costs of the air curtain are minimal. An air curtain is an air stream that flows from one or two narrow strips (see figure). When the curtain air flow passes through the open hole, the outdoor air G_H and the indoor air G_n are ejected. Under the effect of the difference in outdoor and indoor pressure, airflow can cover the entire hole and partially enter the room (Figure a)