氨/氢气湍流预混火焰传播特性实验研究  

Experimental Study on Turbulent Premixed Flame Propagation Characteristics of Ammonia/Hydrogen Mixtures

作　　者：边志坚 王金华[1] 赵浩然 蔡骁 代鸿超 黄佐华[1] Bian Zhijian;Wang Jinhua;Zhao Haoran;Cai Xiao;Dai Hongchao;Huang Zuohua(State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《燃烧科学与技术》2020年第6期551-557,共7页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51776164).

摘　　要：氨作为氢的载体,是一种极具发展潜力的无碳燃料.利用湍流定容燃烧弹,以氨为主要燃料,开展了不同当量比、掺氢比、湍流强度等参数条件下的氨/氢气湍流火焰传播特性实验研究.利用高速摄影纹影技术,测量了混合气预混层流火焰传播过程,进一步研究了湍流火焰发展图像,获得了湍流火焰速度,并得到了其归一化拟合公式,分析了氨及氨/氢气的湍流火焰传播特性.结果表明:掺混氢气能够显著提升氨/氢气的火核稳定程度,且随着掺氢比的提高,湍流燃烧速度显著提升,燃烧强度增强;随着火焰半径和湍流强度的增加,火焰褶皱比逐渐增大,湍流燃烧更加剧烈;通过火焰雷诺数可以对不同当量比、湍流强度下的湍流燃烧速度进行较好地归一化拟合,幂指数均在0.5左右,表明湍流火焰呈现自相似加速传播.As a carrier of hydrogen,ammonia is a carbon-free fuel with great potential.Using ammonia as the main fuel,the turbulent flame propagation characteristics of ammonia/hydrogen mixtures were experimentally studied with a turbulent constant volume combustion bomb under various equivalence ratios,hydrogen blending ratios,and turbulence intensities.The high-speed Schlieren technique was used to study the turbulent flame propagation images based on the measurement of turbulent flame characteristics.The turbulent flame velocity was obtained and its normalized fitting formula was derived.The turbulent flame propagation characteristics of ammonia and ammonia/hydrogen were analyzed.Results show that hydrogen addition can significantly improve the stability of the ammonia/hydrogen flame.With the increase in the hydrogen blending ratio,the turbulent burning velocity was significantly increased,and the combustion intensity was enhanced.With the increase in flame radius and turbulence intensity,the flame wrinkle ratio gradually increased,and the turbulent combustion was more intensive.The Reynolds number of flame can be used to better normalize the turbulent burning velocity under different equivalence ratios and turbulence intensities,and the power exponents after fitting were all about 0.5,showing that the turbulent flame was under self-similar accelerative propagation.

关 键 词：氨 氢气 湍流火焰传播 湍流燃烧速度 火焰褶皱比 

分 类 号：TK16[动力工程及工程热物理—热能工程]