所属单位：

建筑设备科学与工程学院

发表刊物：

Building Sevices Engineering Research&Technology

关键字：

中文关键字：管道；阻力；弯管；耦合弯管；能量耗散，英文关键字：Duct; drag; bend; coupled bend; energy consumption

摘要：

Owing to the limited installation space and duct size, coupled fittings are common in the duct systems of buildings. The coupling effect leads to changes in drag and fan energy consumption. This study investigates duct drag and flow field characteristics under coupling conditions. Experiments and numerical simulations with the Reynolds stress model are conducted. Flow field changes, flow field deformation, and drag changes in the duct are analyzed. Regardless of the coupling form, the velocity near the inner arc is fast, whereas that near the outer arc is slow. Under three different coupling connection conditions (S-shaped, L-shaped, and U-shaped), the outlet velocity gradient of the U-shaped coupling connection is the least obvious. After the fluid flows through the bend, a significant centerline velocity reduction can be observed, even greater than that in the bend. The lowest centerline velocity lies within the range of 2.5 D to 4.5 D after the bend. Coupling connection has an insignificant effect on upstream duct resistance. The resistance of single bend is less than that of the downstream bend for the coupled bend and greater than that of the upstream bend under coupling conditions.

备注：

李安桂

合写作者：

陈仕扩,杨志刚,从北华

第一作者：

李安桂[重名-待确认],高然

论文类型：

期刊论文

卷号：

卷：

期号：

期：

页面范围：

页：

是否译文：

否

发表时间：

2016-10-01