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首页> 外文期刊>International Journal of Heat and Mass Transfer >Novel scaling law for long-term interface displacement of a stratified layer by erosion mixing due to turbulent impinging jet applicable to nuclear power plants
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Novel scaling law for long-term interface displacement of a stratified layer by erosion mixing due to turbulent impinging jet applicable to nuclear power plants

机译：通过适用于核电站的湍流撞击喷射因子腐蚀混合的分层层长期界面位移的新型缩放规律

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摘要

The distribution and mixing characteristics of hydrogen gas are important for assessing the hydrogen risk in nuclear power plants (NPPs) during severe accidents. To estimate such characteristics, analyzing the erosion mixing process of a stratified hydrogen layer subject to a turbulent impinging jet is necessary. In this paper, we propose a novel scaling law for the interface displacement of a stratified layer by erosion mixing as the result of a turbulent jet impingement in a long-term transient state. We show that interface displacement has nonlinear and time-dependent relationships with flow conditions such as the competitive force between the turbulent jet and stratified layer, as well as geometric parameters such as the vessel diameter. We extend the mass conservation law for the entrainment of a stratified layer over a long elapsed time by incrementally using a scaling law for the entrainment rate that is valid at a quasi-steady state. As a result, we show that the novel scaling law for the long-term interface displacement depends on the elapsed time, vessel diameter, and competitive force. The results obtained in previously reported containment flows experiments, as well as those obtained in the present study, are in good agreement with the prediction by the proposed scaling law, demonstrating that this law would be useful for predicting the behavior of the interface displacement of a stratified layer by erosion mixing under various conditions. (C) 2019 Elsevier Ltd. All rights reserved.
机译：氢气的分布和混合特性对于评估严重事故期间核电站（NPPS）的氢风险很重要。为了估计这些特性，需要分析经受湍流撞击射流的分层氢层的腐蚀混合过程。在本文中，我们提出了一种新颖的缩放规律，用于通过侵蚀混合作为长期瞬态状态的湍流喷射冲击的侵蚀混合的分层层界面位移。我们表明界面位移具有与诸如湍流射流和分层层之间的竞争力的流动条件具有非线性和时间依赖关系，以及诸如血管直径的几何参数。我们通过逐步使用缩放规律来延长在长期经过的时间内夹带分层层的大规模保护法，以便在准稳态上有效的夹带速率。结果，我们表明，长期界面位移的新型缩放法取决于经过的时间，血管直径和竞争力。在先前报告的壳体流动实验中获得的结果以及本研究中获得的结果与拟议的扩展法的预测吻合良好，表明这一法律对于预测界面位移的行为是有用的通过各种条件下腐蚀混合分层层。 （c）2019 Elsevier Ltd.保留所有权利。

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