安全壳模型装置内氢气分布特性及影响因素分析

发布时间：2018-01-28 00:12

本文关键词： 安全壳氢气扩散 CFD　出处：《核科学与工程》2017年05期 　论文类型：期刊论文

【摘要】：采用计算流体力学方法,首先利用THAI HM-2实验对CFX分析模型的适用性进行验证,通过与实验数据的比对,表明计算结果与实验数据基本吻合,从而验证选用的模型适合对安全壳模拟装置氢气分布特性的分析。之后,建立待研究中等规模安全壳模型实验装置的三维几何模型和网格模型,采用基准工况+单因素对比的方式,分别模拟湍流浮力射流中心喷射和近壁面喷射工况以及考虑蒸汽壁面冷凝情况下安全壳模型内的氦气(氢气替代工质)流动扩散分布,讨论喷射位置因素、壁面蒸汽凝结效应对氦气分布的影响。分析结果表明,喷射位置对氦气分布的影响主要体现在壁面引流现象上,即氦气流更倾向于沿着安全壳壁面进行流动和扩散;而与安全壳壁面的换热和蒸汽的冷凝会进一步促进大空间自然对流的建立,从而较为显著地提高氦气在安全壳内的扩散和混合效果。
[Abstract]:Using computational fluid dynamics method, the applicability of the CFX analysis model is verified by THAI HM-2 experiment. The comparison with the experimental data shows that the calculated results are in good agreement with the experimental data. In order to verify that the selected model is suitable for the analysis of the hydrogen distribution characteristics of the containment simulator. Then the three-dimensional geometric model and the grid model of the experimental device for the medium-scale containment model are established. The method of single factor comparison of the standard working condition is adopted. The helium (hydrogen alternative working fluid) flow and diffusion distribution in the containment model were simulated under the conditions of turbulent buoyancy jet central jet and near wall jet, respectively, and the spray location factors were discussed. The effect of wall steam condensation on helium distribution. The results show that the effect of injection position on helium distribution is mainly reflected in the wall drainage phenomenon. The helium flow tends to flow and diffuse along the containment wall. The heat transfer with the wall of the containment and the condensation of steam will further promote the establishment of natural convection in large space, thus improving the diffusion and mixing effect of helium gas in the containment.
【作者单位】：上海交通大学机械与动力工程学院;
【基金】：国家科技重大专项资助项目(2015ZX06004003-001)
【分类号】：TL364.3
【正文快照】： 轻水堆发生堆芯熔化的严重事故时,锆合金包壳与水蒸气发生锆水反应,产生大量的燃爆气体(氢气)并释放到安全壳内,给安全壳的完整性带来极大的挑战。福岛核事故的教训表明,氢气在安全壳内的迁移和集聚,在局部区域会达到甚至超过爆炸极限,在外界条件的诱导下,可能发生燃烧或爆炸,

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