Although significant advances have been made in tandem-blade technology for axial and centrifugal compressors, little attention has been paid to its application in centrifugal pumps. In this study, we propose a new tandem-blade design method for improving inner flow characteristics and overall performance of a centrifugal pump. With the SST k − ω turbulence model, three-dimensional turbulent flow fields in the centrifugal pump with tandem blades are simulated and analyzed. The effects of tandem blades on the inner flow and performance characteristics of the centrifugal pump are investigated. The predicted velocity and pressure distributions and flow behavior of the tandem-blade impeller are compared with those of a conventional single row blade impeller. It is indicated that the centrifugal tandem-blade impeller exhibits a significant advantage in terms of the uniformity of the impeller discharge flow. The tandem blades improve the jet-wake structure and uniformity of velocity and pressure distributions at the impeller outlet, and thus reduce the pressure fluctuation and hydraulic loss. Moreover, the hump phenomenon is eliminated or alleviated under low flow rate conditions, and the tandem-blade impeller has better hydraulic performance within a wider operating range as well as high reliability. This study provides a basis for the further development of the centrifugal pump with tandem blades.

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串联叶片对离心泵内流及性能特性影响的研究

尽管用于轴流式和离心式压缩机的串联叶片技术取得了重大进展，但很少有人关注其在离心泵中的应用。在这项研究中，我们提出了一种新的串联叶片设计方法，用于改善离心泵的内部流动特性和整体性能。使用 SST k − ω 湍流模型，对串联叶片离心泵中的三维湍流流场进行了模拟和分析。研究了串联叶片对离心泵内流和性能特性的影响。将串联叶片叶轮的预测速度和压力分布以及流动行为与传统的单排叶片叶轮进行比较。结果表明，离心串联叶片叶轮在叶轮排出流的均匀性方面表现出显着的优势。串联叶片改善了叶轮出口处的射流尾流结构和速度和压力分布的均匀性，从而减少了压力波动和水力损失。此外，在低流量条件下消除或减轻了驼峰现象，串联叶片叶轮在更宽的工作范围内具有更好的水力性能和高可靠性。本研究为进一步开发串联叶片离心泵提供了依据。从而减少压力波动和水力损失。此外，在低流量条件下消除或减轻了驼峰现象，串联叶片叶轮在更宽的工作范围内具有更好的水力性能和高可靠性。本研究为进一步开发串联叶片离心泵提供了依据。从而减少压力波动和水力损失。此外，在低流量条件下消除或减轻了驼峰现象，串联叶片叶轮在更宽的工作范围内具有更好的水力性能和高可靠性。本研究为进一步开发串联叶片离心泵提供了依据。