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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >PIV measurement of internal flow characteristics of very low specific speed semi-open impeller
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PIV measurement of internal flow characteristics of very low specific speed semi-open impeller

机译：极低比速半开式叶轮内部流动特性的PIV测量

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摘要

Detailed particle-image velocimetry (PIV) measurements of flow fields inside semi-open impellers have been performed to understand better the internal flow patterns that are responsible for the unique performance of these centrifugal pumps operated in the range of very low specific speed. Two impellers, one equipped with six radial blades (impeller A) and the other with four conventional backward-swept blades (impeller B), are tested in a centrifugal pump designed to be operated at a non-dimensional specific speed of n(s)=0.24. Complex flow patterns captured by PIV are discussed in conjunction with the overall pump performance measured separately. It is revealed that impeller A achieves higher effective head than impeller B even though the flow patterns in impeller A are more complex, exhibiting secondary flows and reverse flows in the impeller passage. It is shown that both the localized strong outward flow at the pressure side of each blade outlet and the strong outward through-flow along the suction side of each blade are responsible for the better head performance of impeller A.
机译：已对半开式叶轮内部的流场进行了详细的颗粒图像测速（PIV）测量，以更好地了解内部流型，这些内部流型是导致这些离心泵在极低比转速范围内运行的独特性能的原因。在离心泵中测试了两个叶轮，其中一个装有六个径向叶片（叶轮A），另一个装有四个传统的后掠叶片（叶轮B），该离心泵设计成可在n维的无量纲比速下运行= 0.24。结合单独测量的整体泵性能讨论了PIV捕获的复杂流型。揭示了即使叶轮A中的流型更复杂，在叶轮通道中表现出二次流和逆流，叶轮A也比叶轮B具有更高的扬程。结果表明，每个叶片出口压力侧的局部强向外流和沿着每个叶片吸力侧的强向外流都有助于叶轮A更好的扬程性能。

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