离心通风机蜗壳内部三维流动的测量和分析

利用五孔探针对离心通风机大宽度矩形截面蜗壳内部的三维流动进行了详细的测量 ,给出了蜗壳螺旋通道部分八个横截面内比较清晰的时均速度、静压和总压的分布图形 ,反映了二次旋涡的形成与发展、通流方向的扩压流动和叶轮轮盖外侧蜗壳空腔下部流动的变化、蜗舌附近的气流冲击和内泄漏现象等 ,并对这种蜗壳存在的主要损失进行了初步分类。

Measurement and Analysis of Three-Dimensional Flow in Centrifugal Fan Volute

The 3 D flow in a centrifugal fan volute, which has big volute width and rectangular cross section, has been measured in detail by means of five hole probe at 1600 rpm and designed flow rate (30.3 m3/s). The time average velocity, static and total pressure distributions in eight cross sections along the circumferential direction of the volute are presented. These results show some peculiar flow phenomena in the fan volute, such as formation and development of swirling flow, the variation of through flow, the real flow pattern in the area near the impeller shroud outside, the flow shock and leakage near the volute tongue, etc.. Based on the results, the type of main hydraulic losses in this kind of fan volute is suggested preliminarily.