蜗壳截面形状对离心泵性能特性的影响
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武汉理工大学

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Research on the Influence of Volute Section Shape on Performance Characteristics of Centrifugal Pump
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Wuhan University of Technology

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    摘要:

    为了研究蜗壳截面形状对舰用离心泵性能的影响作为后续研究舰用离心泵噪声振动特性的理论依据。在保证蜗壳基圆、前八断面面积、蜗壳出口位置、蜗壳出口直径和中心高相同的前提下,改变蜗壳截面形状,分别设计A、B、C三种型式的蜗壳;以清水为介质,对离心泵进行数值计算。结果表明:三种型式蜗壳,离心泵外特性变化趋势基本一致,小流量工况下A型蜗壳离心泵效率略小,大流量工况下B、C型蜗壳离心泵效率小,随着流量的增大B、C型离心泵效率下降幅度较大;三种型式蜗壳离心泵在相同工况下静压分布、流线分布、流速分布、湍动能分布、气体体积分数分布趋势大致相同。在叶轮靠近隔舌处流道和蜗壳流道中变化不同,这表明改变蜗壳截面形状主要影响叶轮出口及蜗壳流道内的流场。

    Abstract:

    In order to study the influence of the volute section shape on the performance of naval centrifugal pump as the theoretical basis for the subsequent research on the noise and vibration characteristics of naval centrifugal pump. Under the premise of ensuring the base circle of the volute, the area of the first eight sections, the outlet position of the volute, the outlet diameter of the volute and the center height are the same, the section shape of the volute is changed, and three volute types of A, B and C are designed respectively. The centrifugal pump was numerically calculated with clear water as the medium. The results show that the external characteristics of the centrifugal pump of the three types of volute are basically the same. The efficiency of type A volute centrifugal pump is slightly smaller under the condition of low flow rate, while that of type B and C volute centrifugal pump is small under the condition of large flow rate. With the increase of flow rate, the efficiency of type B and C centrifugal pump decreases greatly. The static pressure distribution, streamline distribution, velocity distribution, turbulent kinetic energy distribution and gas volume fraction distribution trend of the three types of volute centrifugal pumps under the same working conditions are roughly the same. The change of the passage near the impeller tongue is different from that in the volute passage, which indicates that the change of the volute section shape mainly affects the flow field at the impeller outlet and the volute channel.

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  • 收稿日期:2021-07-15
  • 最后修改日期:2021-07-22
  • 录用日期:2021-07-28
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