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Influence of Prewhirl Regulation by Inlet Guide Vanes on Cavitation Performance of a Centrifugal Pump

机译：进口导流叶片预旋调节对离心泵空化性能的影响

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The influence of prewhirl regulation by inlet guide vanes (IGVs) on a centrifugal pump performance is investigated experimentally and numerically. The experimental results show that IGVs can obviously change the head and increase the efficiency of the tested centrifugal pump over a wide range of flow rates. Although the cavitation performance is degraded, the variation of the cavitation critical point is less than 0.5 m. Movement of the computed three-dimensional streamlines in suction pipe and impeller are analyzed in order to reveal the mechanism how the IGVs realize the prewhirl regulation. The calculated results show that the influence of IGVs on the cavitation performance of centrifugal pump is limited by a maximum total pressure drop of 1777 Pa, about 7.6% of the total pressure at the suction pipe inlet for a prewhirl angle of 24°.
机译：通过实验和数值研究了进气口导向叶片（IGV）进行的预旋调节对离心泵性能的影响。实验结果表明，IGV可以在很宽的流量范围内明显改变扬程并提高被测离心泵的效率。虽然空化性能下降，但是空化临界点的变化小于0.5m。分析了所计算的三维流线在吸管和叶轮中的运动，以揭示IGV如何实现预旋调节的机理。计算结果表明，IGV对离心泵空化性能的影响受到最大总压降1777 Pa的限制，对于预旋转角度为24°，最大压降约为吸油管入口总压的7.6％。

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