内燃机工程2024，Vol.45Issue(6)：39-47,9.DOI:10.13949/j.cnki.nrjgc.2024.06.005
水蒸气稀释条件下NH3/H2层流燃烧特性研究
Investigation on Laminar Burning Characteristics of Ammonia/Hydrogen under Water Vapor Dilution
摘要
Abstract
The mechanism of the influence of water vapor dilution(0～50%)on the combustion characteristics of NH3/H2 was investigated under the conditions of initial pressure of 101.3 kPa,chemical equivalence ratio of 0.8～1.4 and hydrogen blending ratio of 0.3～0.7,by the method of a constant volume combustion bomb experiment together with the method of one-dimensional laminar premixed flame numerical calculation.The results show that the laminar flame speed of NH3/H2 first increased and then decreased with the increase of equivalence ratio,with a peak appearing around 1.2 equivalence ratio.As the dilution ratio of water vapor increased,the laminar flame speed of NH3/H2 decreased linearly,and its peak shift towards the equivalence ratio of 1.1,and the sensitivity affected by the equivalence ratio decreased.The chemical kinetic analysis result shows that the dilution effect has the greatest impact among different physical and chemical effects of water vapor.The branch chain reactions such as R1,R3,and R68 promote laminar flame propagation,while branch chain reactions such as R16,R58,and R60 have the opposite effect.A higher water dilution ratio increases the sensitivity coefficient of critical branch chain reactions to laminar flame speed,and the growth trend of sensitivity coefficient continues to increase.With the increase of the water dilution ratio,the molar fractions of free radicals such as NO,N2O,OH in the reaction zone significantly decrease,leading to a decrease in the laminar flame speed of NH3/H2.关键词
氨/氢/水燃烧/定容燃烧弹/层流火焰速度/化学动力学分析Key words
ammonia/hydrogen/water combustion/constant volume combustion bomb/laminar flame speed/chemical kinetics analysis分类
能源科技引用本文复制引用
古祥,孟顺,钱叶剑,龚震,孙豫,葛鑫斌..水蒸气稀释条件下NH3/H2层流燃烧特性研究[J].内燃机工程,2024,45(6):39-47,9.基金项目
安徽省科技重大专项项目(202003a05020023)Anhui Provincial Major Science and Technology Project(202003a05020023) （202003a05020023）
