| 熔融池氧化物层自然对流的数值模拟 |
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| 引用本文： | 汲水,胡腾,史韵白,常华健.熔融池氧化物层自然对流的数值模拟[J].原子能科学技术,2016,50(3):424-429. |
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| 作者姓名： | 汲水 胡腾 史韵白 常华健 |
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| 作者单位： | 1.国家核电技术有限公司 北京研发中心，北京102209；2.清华大学 核能与新能源技术研究院，北京100210 |
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| 基金项目： | 国家科技重大专项资助项目(2011ZX06002-004) |
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| 摘 要： | 本文以BALI试验段为对象建模，对其中有内热源的湍流自然对流流体进行了二维数值模拟。模拟工况的瑞利数Ra高达1012～1015。流体的湍流运动用大涡模拟模型来捕捉。通过对下边界局部热流密度的面积加权积分，计算了三维下边界换热量。结果表明，Ra对流场、温度场与下边界局部热流密度分布均有显著影响。计算所得上下边界的Ra-Nu关系与试验结果符合较好。对不同物理机理导致的下边界热流密度分布规律进行了分析。
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| 关 键 词： | 严重事故 熔融物堆内滞留 氧化物层 自然对流 大涡模拟 |
Numerical Simulation of Natural Convection in Oxide Layer of Molten Pool |
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| JI Shui,HU Teng,SHI Yun-bai,CHANG Hua-jian.Numerical Simulation of Natural Convection in Oxide Layer of Molten Pool[J].Atomic Energy Science and Technology,2016,50(3):424-429. |
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| Authors: | JI Shui HU Teng SHI Yun-bai CHANG Hua-jian |
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| Affiliation: | 1.State Nuclear Power Technology R&D Center, Beijing 102209, China;2.Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100210, China |
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| Abstract: | The two‐dimensional numerical simulation of turbulent natural convection in a model of BALI test section with internal heat source was presented .The simulation was carried out at Rayleigh number of 1012‐1015 .The turbulent flow of the fluid was cap‐tured with a large‐eddy simulation (LES) model .Through area‐weighted integration of local heat flux on lower boundary ,the three‐dimensional heat flow of lower boundary was calculated .The results show that the Rayleigh number has a significant effect on flow field ,temperature field and distribution of local heat flux on lower boundary .The calculated Ra‐Nu relation on both upper and lower boundaries is in good agreement with experimental results .The heat flux distribution on lower boundary caused by different physical mechanisms has also been analyzed . |
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| Keywords: | severe accident in-vessel retention oxide layer natural convection large-eddy simulation |
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