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无导叶低压轴流风机目前在生产实践中运用相当广泛。这种风机有着结构简单、制造方便的优点,但同具有导叶的风机相比其缺点就是效率较低。为了保持这种风机固有优点的基础上,尽可能提高其性能,以达到节约能源的目的,本文从理论上分析,探讨这种具有单独工作轮结构的低压轴流风机在各种叶型的扭曲规律下,可能达到的最大理论效率问题。 一、基元级的理论效率和反动度的关系 由于工作轮前无进口导叶,故可认为进入工作轮的气体无预旋,即CIu=0。要保证工作
Vaneless low-pressure axial fan is currently used in a wide range of production practices. This fan has the advantages of simple structure, easy manufacture, but the disadvantage compared with the guide vane fan is less efficient. In order to maintain the inherent advantages of this fan, to maximize its performance, in order to achieve the purpose of energy conservation, this paper theoretically analyzed and discussed the low pressure axial fan with a separate wheel structure in a variety of leaf-type distortion Under the law, the maximum theoretical efficiency that may be reached. First, the theoretical level of elementary efficiency and the relationship between the reaction due to the work before the import guide vane, it can be considered into the work of the gas without pre-rotation, that CIu = 0. To ensure that work