对两种单向洁净室再循环系统（轴流式洁净室和风机过滤单元（FFU）式洁净室）的运行特性进行了研究和数值比较。本研究将风机性能曲线和系统部件的流阻曲线直接纳入计算流体动力学（CFD）分析中。因此，计算系统运行时，无需对外壳内的气流和压力进行迭代，以匹配风扇的特性。同样，为了确定功耗，将风扇能量纳入模型中。结果表明，当考虑ULPA（超低穿透空气）过滤器表面速度的均匀性、工作区气流的偏角和能耗等因素时，FFU系统的性能通常优于轴流风机系统。 单元:干燥:研讨会论文，大西洋城，2002年

The operational characteristics of two types of unidirectional clean room recirculation systems (i.e., an axial type clean room and a fan-filter unit (FFU) type clean room) were investigated and compared numerically. The fan performance curves and the flow resistance curves of system components were directly incorporated into the computational fluid dynamics (CFD) analysis in this study. Thus, the system operation was calculated without need of iterations for the airflow and the pressure within the enclosure to match the fan's characteristics. The fan energy was similarly incorporated into the model in order to determine the power consumption. The results show that the performance of the FFU system is generally superior to that of an axial fan system when considering factors such as uniformity of the ULPA (ultra low penetration air) filter face velocity, deflection angle of airflow in the working zone, and energy consumption.Units: SI