【作者】 石文涛； 杜海鸥；

【Author】 SHI Wen-tao;DU Hai-ou;China Institute of Atomic Energy;

【机构】 中国原子能科学研究院；

【摘要】 钠火安全是快堆安全考虑的重要内容,其中雾状钠火可能造成的后果最为严重。本文结合计算流体力学(CFD)方法开展雾状钠火的三维计算模拟,是对三维钠雾火分析技术的初步研究,经进一步完善和验证,可为我国后续钠冷快堆的钠雾火分析及钠火消防设计提供依据。在三维计算流体力学软件FLUENT的基础上,开发了用于雾状钠火分析的计算模块。程序计算了连续相烟气输运、空气流动的湍流过程,组分输运和燃烧反应的过程,钠滴与气相的热质传递过程,以及喷雾区气体温度的不均匀性、雾状流区内的氧气损耗和重力的影响。并建立了钠及其燃烧产物的物性数据库,完成了容器内液态钠喷雾燃烧的计算模拟。通过模拟展现了容器内实心锥形液态钠喷雾燃烧的热功率分布变化详细过程,其变化趋势与美国桑迪亚国家实验室的容器内液态钠喷雾燃烧试验结果基本一致。更多还原

【Abstract】 Sodium fire safety is an important part of fast reactor safety,and the consequence of sodium spray fire is the most serious.This paper applies CFD method to a three-dimensional transient simulation of the liquid sodium spray fire process.It is a preliminary study to the threedimensional sodium spray fire analysis technology,with further verification and completion,which could do a good support for the sodium spray fire analysis and protection design in future sodium cooled fast reactor of China.Based on the three-dimensional CFD software called FLUENT,the module of sodium spray combustion calculation is developed.The model include the process of continuous phase’s transport and turbulence,species transport and combustion,heat and mass transfer between sodium droplets and gas phase,and the influence of gravity.The spray zone’s gas temperature non-uniformity and oxygen depletion is also calculated.The database of sodium and its combustion products properties is also established,and the simulation of liquid sodium spray fire in vessel is completed.The simulation shows the detailed process of solid-conical liquid sodium spray fire’s thermal power distribution and change in vessel.And the change trend is consistent with Sandia National Laboratories’ In-vessel Sodium Spray Fire Test.更多还原