对现有风机节能改造可采用更换或切削叶轮、调整可调叶片角度，改变扩压器叶片角度以及风机变速运行等措施。

Changing or cutting the impeller, adjusting the angles of variable blades, changing the angles of pressure expander and variable speed of fans may be adopted for the energy-saving of fans on hand.

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发现了叶片扩压器对遏制蜗壳对叶轮内流场的影响有明显的作用。

It is found that vane diffuser restrains the influence of the volute on the impeller.

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详细分析了叶片扩压器内部的非定常流动现象和流动规律。

The phenomenon and law of unsteady flow in blade diffusor is analyzed in detail.

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