基于CFD的氢气扩散火焰燃烧分析

Analysis of Hydrogen Diffusion Flame by CFD

日本福岛核事故后,氢气风险对于安全壳完整性的挑战成为反应堆安全设计的热点问题。当前的氢气风险分析普遍采用一体化分析程序,对于局部区域氢气扩散火焰的分析存在缺陷和不足。本文依托CFD程序,建立了安全壳内局部隔间的CFD氢气扩散火焰燃烧的分析方法,研究了扩散火焰的燃烧特性,获得了严重事故下的安全壳温度载荷。研究结果表明,安全壳壁面虽然承受较高的温度载荷,但蠕变失效的概率很低。

The threat to containment integrity due to hydrogen risk has become a hot spot in the field of reactor safety design since Fukushima Dachii accident.The lumped code,which can only calculate average gas concentration,is not appropriate for local hydrogen risk assessment.To resolve the potential risk from local hydrogen diffusion flame,the CFD code is employed to establish the method of hydrogen diffusion flame analysis,research the characteristics of flame behavior and obtain the thermal load on containment wall.The results indicate the containment wall undergoes high thermal load with very limited time.The possibility of creep rupture is physically impossible by using Larson-Miller approach.