带有进气箱的轴流风机性能变化数值分析

本文对带有和没有进气箱的轴流风机进行了多个工况的整机三维流场分析,着重分析了进气箱内部的流动和出口速度的分布对风机性能的影响.计算结果表明,在符合良好流场设计原则的进气箱内部出现了明显的流动分离,该分离导致的进气箱出口速度不均匀分布引起了轴流风机的效率明显下降,但是出口压力却略有上升的效果.分析结果表明该进气箱需要进行进一步改进.该分析对类似进气箱的设计也有一定的参考价值.

NUMERICAL STUDIES OF THE EFFECT OF AN INLET BOX ON THE PERFORMANCE OF AN AXIAL FLOW FAN

Numerical studies on the 3D flow fields in an axial flow fan with and without an inlet box have been extensively carried out in this paper.This research is focused on the variation of the fan's performance caused by the internal flow fields and the velocity evenness at exit of the inlet box,and it is interested to find that although the inlet box is designed in accord with the basic design principles, there is a flow separation region in it.Furthermore this flow separation and the resulting uneven velocity distribution at exit cause some decrease of the efficiency and increase of the total pressure of the fan.Our research shows that the inlet box needs further improvement and such examination is of value for the design of similar inlet boxes.