摘要
点火器广泛应用于核电站以实现氢气低浓度下的控制性燃烧,缓解核电站严重事故下的氢气风险。本文应用三维计算流体力学程序GASFLOW对一圆柱罐体内不同浓度的氢气-空混合气体的燃烧特性进行分析。低浓度氢气混合气体只有极少部分燃烧,大于8%的情况下出现明显的氢气燃烧和温度、压力的上升。根据火焰加速σ准则和燃爆转换D/7λ准则,大于11%的情况下可能会出现火焰加速,大于12%的情况下有燃爆转换的可能。不同浓度混合气体燃烧的火焰传播路径也不同,较低浓度气体燃烧火焰先向上再向下传播,较高浓度气体燃烧火焰向四周传播。
On purpose of mitigating hydrogen hazards in nuclear power plants in the case of severe accidents, the hydrogen igniter is used widely to control the combustion of hydrogen in low concentration. The combustion of hydrogen-air mixture in a cylinder is analyzed with the 3D CFD code GASFLOW. Only part of the hydrogen is consumed for the mixture with low concentration of hydrogen, and the pressure and temperature have obviously rises for the cases with hydrogen concentration higher than 8 percent. According to the sigma criterion and lambda criterion, it has the possibility of flame acceleration for mixture with hydrogen concentration higher than 11 percent and deflagration to detonation transition （DDT） for mixture with hydrogen concentration higher than 12 percent. For mixtures with different hydrogen concentration, the paths of flame propagation are also different. The flame of lower concentration mixture shows upward propagation and that with higher concentration may have the propagation in all directions.
出处
《核科学与工程》
CSCD
北大核心
2015年第2期283-288,共6页
Nuclear Science and Engineering
基金
大型先进压水堆核电站重大专项
严重事故机理及现象学研究(2011ZX06004008-002)
国际热核聚变实验堆(ITER)计划专项
磁约束聚变堆若干相关工程技术研究(2010GB108000)
