Numerical Study of Unsteady Pressure Fluctuation at Impeller Outlet of a Centrifugal Pump

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

Science and Technology of Nuclear Installations Pub Date : 2022-08-30 DOI:10.1155/2022/1758382

Xiaojie Ma, Lulu Zheng, Jinglei Qu, Mengmeng Wang

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引用次数: 1

Abstract

Intense fluid-dynamic interaction at the impeller outlet strongly affects the unsteady flow and pressure stability within the centrifugal pump. In order to have a better understanding of the pressure fluctuation of centrifugal pumps, a numerical calculation is carried out by using the RNG k-epsilon turbulence model under various flow rates. The numerical calculation results are compared with the experimental results in order to verify the reliability of the calculation model. The amplitude and frequency distribution of pressure fluctuation at the impeller outlet is obtained and analyzed in the time and frequency domain. The research results show that the blade passing frequency is the dominant frequency of the pressure fluctuation. And the pressure fluctuation is a periodic fluctuation. As the flow rate decreases, the periodicity of the pressure fluctuation decreases. Besides, the amplitude and intensity of pressure fluctuation are closely related to flow rate and spatial location. At the low flow rate, the amplitude of pressure fluctuation in the time domain and frequency domain is enlarged greatly, especially near the tongue region. The pressure difference distribution on both sides of the blade surface is extremely uneven, and the pressure changes significantly.

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离心泵叶轮出口非定常压力脉动的数值研究

叶轮出口处强烈的流体动力相互作用强烈影响离心泵内的非定常流动和压力稳定性。为了更好地理解离心泵的压力波动，采用RNG k-epsilon湍流模型对不同流量下的离心泵进行了数值计算。为了验证计算模型的可靠性，将数值计算结果与实验结果进行了比较。得到了叶轮出口压力波动的幅值和频率分布，并对其进行了时域和频域分析。研究结果表明，叶片通过频率是压力波动的主导频率。压强波动是周期性波动。随着流量的减小，压力波动的周期性减小。压力波动的幅度和强度与流量和空间位置密切相关。在低流量下，压力波动在时域和频域的幅值都大大增大，特别是在舌部附近。叶片两侧表面压差分布极不均匀，压力变化明显。

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.