Influence of Weak Compressibility on the Hydrodynamic Performance Evaluation of Pump Turbines in the Pump Mode

IF 1 4区工程技术 Q3 NUCLEAR SCIENCE & TECHNOLOGY

Science and Technology of Nuclear Installations Pub Date : 2022-05-20 DOI:10.1155/2022/3544436

Fangfang Zhang, Nana Li, Di Zhu, R. Xiao, Weichao Liu, R. Tao

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引用次数: 4

Abstract

In general, weak compressibility is one of the properties of liquids. That is, in actual operation of hydraulic machinery, the flow is weakly compressible. However, the influence of weak compressibility is often neglected in usual numerical simulation, which makes the simulation results different from the experimental results. Based on the Computational Fluid Dynamics (CFD) solver and model test rig, by means of mutual verification between numerical simulation and experiment, the fitting degree between numerical results and experimental results before and after considering weak compressibility is compared and analyzed in this paper; it is obtained that the numerical results is closer to the experimental results after considering the weak compressibility. In addition, velocity field of pump turbines, head loss of main components, and the change of entropy yield are analyzed and reasons for numerical value being closer to the experimental value after considering weak compressibility of fluid are summarized and analyzed. It is proved that the consideration of weak compressibility is of great significance to improve the accuracy of results in the numerical simulation of pump turbines.

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弱可压缩性对水泵水轮机泵态水动力性能评价的影响

一般来说，弱可压缩性是液体的性质之一。即在液压机械的实际运行中，流体是弱可压缩的。然而，在通常的数值模拟中，往往忽略弱压缩性的影响，导致模拟结果与实验结果存在差异。基于计算流体动力学(CFD)求解器和模型试验台，通过数值模拟与实验的相互验证，对比分析了考虑弱压缩性前后数值结果与实验结果的拟合程度;计算结果表明，考虑弱压缩性后，数值计算结果更接近实验结果。分析了水泵水轮机的速度场、主要部件水头损失、熵产的变化，总结分析了考虑流体弱压缩性后数值更接近实验值的原因。结果表明，考虑弱可压缩性对提高水泵水轮机数值模拟结果的准确性具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science and Technology of Nuclear Installations NUCLEAR SCIENCE & TECHNOLOGY-

CiteScore

2.30

自引率

9.10%

发文量

审稿时长

4-8 weeks

期刊介绍： Science and Technology of Nuclear Installations is an international scientific journal that aims to make available knowledge on issues related to the nuclear industry and to promote development in the area of nuclear sciences and technologies. The endeavor associated with the establishment and the growth of the journal is expected to lend support to the renaissance of nuclear technology in the world and especially in those countries where nuclear programs have not yet been developed.