赵存生, 韩小溪, 崔哲. 离心泵口环间隙流动特性的数值模拟[J]. 中国舰船研究, 2020, 15(4): 159-167. DOI: 10.19693/j.issn.1673-3185.01806
引用本文: 赵存生, 韩小溪, 崔哲. 离心泵口环间隙流动特性的数值模拟[J]. 中国舰船研究, 2020, 15(4): 159-167. DOI: 10.19693/j.issn.1673-3185.01806
ZHAO Cunsheng, HAN Xiaoxi, CUI Zhe. Numerical simulations of flow characteristics of wear-ring clearance in the centrifugal pump[J]. Chinese Journal of Ship Research, 2020, 15(4): 159-167. DOI: 10.19693/j.issn.1673-3185.01806
Citation: ZHAO Cunsheng, HAN Xiaoxi, CUI Zhe. Numerical simulations of flow characteristics of wear-ring clearance in the centrifugal pump[J]. Chinese Journal of Ship Research, 2020, 15(4): 159-167. DOI: 10.19693/j.issn.1673-3185.01806

离心泵口环间隙流动特性的数值模拟

Numerical simulations of flow characteristics of wear-ring clearance in the centrifugal pump

  • 摘要:
      目的  在开展离心泵的结构设计和性能研究时,往往易忽略口环间隙的影响。口环间隙不仅将改变离心泵的外特性,还将影响其流场分布,故需深入分析离心泵口环间隙的流动特性。
      方法  以某型中比转速的立式离心泵作为研究对象,采用ANSYS CFX开展仿真模拟,分析不同口环间隙(0,0.5,0.7,1.06 mm)对离心泵外特性、压力分布和速度分布的影响。
      结果  结果表明:不同口环间隙下,离心泵外特性的仿真结果与实验数据基本一致,两者的相对误差小于5%(1.06 mm间隙除外),验证了数值仿真方法的可信度;随着口环间隙的增加,在设计工况下,离心泵的扬程约下降20%,效率约下降19%;小间隙处的叶轮前、后盖板局部压强有所增加,大间隙处的整体压强有所下降,叶轮盖板的径向压强呈不对称分布;口环间隙导致流体内部的湍流紊乱,而离心泵进口和出口处的压强和速度均呈现出不均匀的渐进梯度分布。
      结论  研究成果可为离心泵的结构设计和流场特性分析提供参考。

     

    Abstract:
      Objectives  When research is conducted for the centrifugal pumps' structural design and performance, the influence of the seal ring clearance is often neglected. However, the clearance of the seal ring will not only change the external characteristics of the centrifugal pump, but also affect its flow field distribution.
      Methods  In this paper, a vertical centrifugal pump with medium-specific speed is used as the research object. The ANSYS CFX is used to simulate and analyze the influence of different wear-ring clearances(0, 0.5, 0.7, 1.06 mm)on the external characteristics, pressure distribution, and velocity distribution of the centrifugal pump.
      Results  The results show that the external characteristics of the centrifugal pump with different annulus clearances are consistent with the experimental data. The relative error of two is less than 5%(except 1.06 mm clearance). This verifies the reliability of the numerical simulation. With the increase of the clearance of the seal ring, the head of the centrifugal pump decreases by 20% and the efficiency by 15% under design conditions. The local pressure of the front and back cover plates of the impeller at the small clearance increases, and the overall pressure at the large clearance decreases, resulting in the radial pressure distribution of the impeller cover plate being asymmetric. The gap of the annulus leads to turbulence in the fluid and the pressure and velocity at the inlet and outlet of the centrifugal pump present an uneven gradient distribution.
      Conclusions  The research results can provide a reference for the structural design and flow field analysis of the centrifugal pump.

     

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