本文研究了具有可变出口面积的房间空气扩散器如何有效地在不同流量下产生恒定的气流。本研究中的扩散器为四通扩散器，带有铰链表面，在其两侧提供可变的出口面积。在两个固定区域出口中的一个下游测量抛距。五个固定出口区域的行程测量用于确定恒定行程性能所需的出口区域随流量的变化。将这些结果与已知弹簧表面恢复力测量的出口面积变化进行比较，以确定恒定摆度所需恢复力的变化。为了提供这种恢复力，在扩散器中安装了杠杆臂/配重机构，并对扩散器的投掷性能进行了评估。 在给定的流量范围（75 cfm至160 cfm）内，发现杆臂/配重扩散器的摆度比固定区域或垂直弹簧摆度保持更恒定。单位:双引文:研讨会，ASHRAE交易，1998年，第104卷，pt。1A，旧金山

This paper examines how effectively a room air diffuser with a variable outlet area can produce a constant throw with varying flow rate. The diffuser for this study is a four-way diffuser with hinged surfaces providing a variable outlet area on two of its sides. The throws were measured downstream of one of the two fixed area outlets. Throw measurements for five fixed outlet areas were used to determine the outlet area variation with flow rate necessary for constant throw performance. These results were compared with the outlet area variation from measurements with a known spring restoring force on the surfaces to determine the variation of the restoring force needed for a constant throw. In order to provide this restoring force, a lever arm/counterweight mechanism was installed in the diffuser, and the diffuser throw performance was evaluated. In a given flow rate range (75 cfm to 160 cfm) the throw from the lever arm/counterweight diffuser was found to remain more constant than the stationary area or vertical spring throws.Units: Dual