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多叶通风机入口流场的可视化试验和实验测量的结果表明，入口气流具有较强的预旋；通过分析比较，指出预旋对多叶风机外轮设计的影响；流场计算的结果说明，叶轮入口边沿轴向采用同一入口安装角的做法是不合理的。
Visual test and experimental measurements of the multi-leaf fan inlet flow field show that the inlet air flow has a strong pre-rotation. The influence of pre-rotation on the outer ring design of multi-blade blower fans is pointed out through analysis and comparison. The results of flow field calculation show that the impeller It is unreasonable to adopt the same entrance installation angle in the axial direction of the entrance edge.