摘要
为了探究管道入口雷诺数(Re,自14600~37400变化)对NH_(3)-CH_(4)预混旋流火焰燃烧特性的影响,固定NH_(3)与CH_(4)的体积流量比为7∶3,预混火焰的当量比为0.85,进行了一系列实验和大涡模拟(LES)研究。研究结果表明,当Re达到14600时,燃烧室内出现稳定的预混湍流火焰。随着Re的增加,燃烧室内部的温度和热释放率均增大,火焰变得愈加稳定。旋流器出口形成的旋转火焰能有效提升燃烧稳定性。在相同的旋流数条件下,增加管道入口Re,其燃烧室内流场结构和湍流强度变化不明显,然而在Re=14600工况下更长的停留时间有利于抑制主火焰区NO的生成和后火焰区NO的消耗。实验和LES结果均表明,燃烧室出口NO排放量随入口雷诺数的增加而增加,且两者吻合良好。
To investigate the influence of inlet pipe Reynolds number(Re,ranging from 14600 to 37400)on NH_(3)-CH_(4) premixed swirling flames,experiments and Large Eddy Simulations(LES)were conducted.With a fixed volume flow rate ratio of NH_(3) to CH_(4) as 7∶3 and an equivalence ratio of 0.85,a series of studies were performed.The results indicate that stable premixed turbulent flames appeared in the combustion chamber when Re reached 14600.As Re increases,the temperature and heat release rate inside the combustion chamber both increase,leading to a more stable flame.Swirling flames formed at the exit of the swirlers,promoting overall combustion stability.Under the same swirling number,increasing Re did not significantly alter the flow field structure and turbulence intensity within the combustion chamber,however,at Re=14600,longer residence times helped suppress NO production in the main flame zone and NO consumption in the post-flame region.Both experimental and LES results consistently show that NO emissions at the combustor outlet increase with higher inlet Reynolds numbers,demonstrating good agreement between them.
作者
帅瑞洋
王平
钱伟佳
戴凯论
张泽雨
ROY Subhajit
SHUAI Ruiyang;WANG Ping;QIAN Weijia;DAI Kailun;ZHANG Zeyu;ROY Subhajit(Institute for Energy Research,Jiangsu University,Zhenjiang 212013,China;State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310058,China)
出处
《推进技术》
北大核心
2025年第7期157-166,共10页
Journal of Propulsion Technology
基金
国家自然科学基金(91741117)
浙江大学能源清洁利用国家重点实验室开放基金(ZJUCEU2022020)。
