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葉片包角對(duì)離心泵性能的影響?yīng)?/div>
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Relationship between Wrap Angle of Impeller and Performance of Pump
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    摘要:

    在保證離心泵主要幾何參數(shù)不變的前提下，使用Hermite插值方法對(duì)葉片包角為90°、120°、150°和180°的4個(gè)葉輪進(jìn)行葉片繪型。數(shù)值模擬分析了不同葉片包角與離心泵性能的關(guān)系。結(jié)果表明，葉片包角因改變?nèi)~輪出口相對(duì)速度液流角而使離心泵揚(yáng)程和功率特性發(fā)生變化，其效果與改變?nèi)~片出口安放角類似。葉片包角增大的同時(shí)葉輪流道內(nèi)的脫流與漩渦也隨之減小，流動(dòng)更貼近葉片型線，但葉輪流道內(nèi)的摩擦損失也隨之增大，離心泵存在一個(gè)使其效率最高的最佳葉片包角。

    Abstract:

    The influence of relationship between wrap angle of impeller on performance of a pump was analyzed with the same main dimensions of centrifugal pumps unchanged. Blades were shaped using Hermite interpolation method. The wrap angle of impellers used in this investigation is 90°, 120°, 150°and 180° respectively. The result of numerical simulation indicates that the wrap angle changes the head and power characteristics by changing the relative velocity angle in impeller outlet. The effect of the different wrap angles is similar to that of the different impeller outlet blade angles. The bigger the wrap angle is, the smaller the separation and vortex in impeller passages are. With the wrap angle increases, the streamlines and blade profiles are getting similar, but the friction loss in impeller passages is getting large. So there exists an optimum wrap angle that corresponds to the highest efficiency of a centrifugal pump.

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張翔,王洋,徐小敏,王洪玉.葉片包角對(duì)離心泵性能的影響?yīng)琜J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2010,41(11):38-42. Relationship between Wrap Angle of Impeller and Performance of Pump[J]. Transactions of the Chinese Society for Agricultural Machinery,2010,41(11):38-42.

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