箱式无蜗壳风机箱体的优化设计

Optimization Design of Box of Plenum Fan

为提高箱式无蜗壳风机出口静压,采用计算流体动力学方法对不同箱体结构参数下的风机性能进行数值模拟研究,分析箱体内部产生流动损失的主要原因,同时确定箱体的最佳结构参数。研究表明:在设计箱式无蜗壳风机时,箱体最佳宽度为1.8倍叶轮外径,箱体出口面边长应大于0.7倍的箱体宽度,箱体轴向长度加长可避免出口面出现由射流卷吸导致的回流。

In order to improving the outlet static pressure of plenum fan, the computational fluid dynamics method is used to conduct numerical simulation research on the fan performance under different structural parameters of the box, the main reason of flow loss inside the box is analyzed, and the best optimal structural parameters of the box is determined. The research shows that when design the plenum fan, the optimum box width is 1.8 times of impeller outer diameter, the side length of box outlet area should be greater than 0.7 times of box width. Lengthening the axial length of the box can avoid the backflow caused by the jet entrainment on the outlet surface of the box.