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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：适用于核电站的湍流撞击射流通过腐蚀混合对分层层进行长期界面位移的新型缩放定律

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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厂（NPP）中的氢气风险非常重要。为了估计这样的特性，需要分析经受湍流冲击射流的分层氢层的腐蚀混合过程。在本文中，我们提出了一种新的缩放定律，用于长期混合状态下湍流射流冲击导致的腐蚀混合作用导致分层层的界面位移。我们表明界面位移与流动条件具有非线性和时间相关关系，例如湍流射流和分层层之间的竞争力以及几何参数（例如容器直径）等流动条件。通过对准稳态下有效的夹带率使用定标定律，我们将质量守恒定律扩展到很长一段时间内夹带分层层。结果，我们证明了长期界面位移的新型缩放定律取决于经过时间，血管直径和竞争力。在先前报道的安全壳流动实验中获得的结果以及在本研究中获得的结果与拟议的定标定律的预测非常吻合，表明该定律将对预测界面的位移行为很有用。在各种条件下通过腐蚀混合形成分层层。 （C）2019 Elsevier Ltd.保留所有权利。

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