Numerical study of gas pocket distribution and pressurization deterioration mechanism in a centrifugal pump

IF 3.3 3区 工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY Progress in Nuclear Energy Pub Date : 2024-09-13 DOI:10.1016/j.pnucene.2024.105443
Xiaobin Su, Qiang Xu, Chenyu Yang, Xiaoyu Dai, Liejin Guo
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Abstract

In the event of a loss-of-coolant accident at a nuclear power plant, a large amount of steam enters the main pump, causing the pump's pressurization to deteriorate or even fail. To reveal the deterioration mechanism of the pump performance, the gas-liquid distribution characteristics in the centrifugal pump were studied by using structured grids and the Eulerian-Eulerian model. Based on the dimensional analysis method, a predictive correlation for bubble size was established, which included factors such as inlet gas volume fraction (IGVF), rotational speed, liquid flow rate, and impeller geometric parameters. When the predictive correlation is applied to the numerical simulation, the numerical two-phase pressurization agrees well with that obtained from the experiment. As the IGVF increases, the gas begins to accumulate at the impeller inlet under the effect of the pressure gradient force. Due to the large increase in liquid velocity, the gas begins to accumulate from the middle of the diffuser flow channel. The area occupied by the gas pocket in the impeller loses its pressurization capability. The pressure vortex formed at the inlet of the channel causes the diffuser to lose its pressurization capacity. An increase in rotational speed and a decrease in liquid flow rate can effectively prevent the formation and development of gas pockets in the impeller.

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离心泵中气穴分布和增压恶化机制的数值研究
在核电站发生失冷事故时,大量蒸汽进入主泵,导致泵的增压性能恶化甚至失效。为了揭示泵性能恶化的机理,利用结构网格和欧拉-欧拉模型研究了离心泵中的气液分布特性。基于尺寸分析方法,建立了气泡大小的预测相关性,其中包括入口气体体积分数(IGVF)、转速、液体流速和叶轮几何参数等因素。将预测相关性应用于数值模拟时,数值两相增压与实验结果非常吻合。随着 IGVF 的增加,气体在压力梯度力的作用下开始在叶轮入口处积聚。由于液体速度大幅增加,气体开始从扩散器流道的中部聚集。叶轮中的气穴所占区域失去了增压能力。在流道入口处形成的压力漩涡导致扩散器失去增压能力。提高转速和降低液体流速可有效防止叶轮中气穴的形成和发展。
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来源期刊
Progress in Nuclear Energy
Progress in Nuclear Energy 工程技术-核科学技术
CiteScore
5.30
自引率
14.80%
发文量
331
审稿时长
3.5 months
期刊介绍: Progress in Nuclear Energy is an international review journal covering all aspects of nuclear science and engineering. In keeping with the maturity of nuclear power, articles on safety, siting and environmental problems are encouraged, as are those associated with economics and fuel management. However, basic physics and engineering will remain an important aspect of the editorial policy. Articles published are either of a review nature or present new material in more depth. They are aimed at researchers and technically-oriented managers working in the nuclear energy field. Please note the following: 1) PNE seeks high quality research papers which are medium to long in length. Short research papers should be submitted to the journal Annals in Nuclear Energy. 2) PNE reserves the right to reject papers which are based solely on routine application of computer codes used to produce reactor designs or explain existing reactor phenomena. Such papers, although worthy, are best left as laboratory reports whereas Progress in Nuclear Energy seeks papers of originality, which are archival in nature, in the fields of mathematical and experimental nuclear technology, including fission, fusion (blanket physics, radiation damage), safety, materials aspects, economics, etc. 3) Review papers, which may occasionally be invited, are particularly sought by the journal in these fields.
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