Combustion characteristics of Ammonia/Air mixture ignited by flame jet with and without hydrogen injection in Pre-Chamber

IF 6.7 1区 工程技术 Q2 ENERGY & FUELS Fuel Pub Date : 2024-11-26 DOI:10.1016/j.fuel.2024.133774
Shuo Yin , Yifang Ren , Jiangping Tian , Zechuan Cui , Xiaolei Zhang , Ping Yan , Keiya Nishida
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Abstract

Ammonia is one of the important fuels that can promote the achievement of carbon neutrality, but its combustion characteristics are not conducive to its application in engines. Injecting hydrogen in the pre-chamber to form a flame jet to ignite the ammonia/air mixture is a method to improve the combustion of ammonia. This ignition method was investigated with the constant volume combustion chamber, high-speed video camera observation and the main-chamber pressure analysis. The flame behavior and combustion characteristics were compared with those ignited by the ammonia flame jet. Hydrogen flame jet significantly enhanced the combustion of the mixture and extended the lean flammability limit. Under conditions of hydrogen injection, the pressure rise delay and combustion duration became shorter, the average heat release rate became higher, and the combustion process was more stable. The hydrogen flame jet rapidly penetrated the main-chamber and impinged on the lower surface, generating intense turbulence. As a result, the combustion pressure took less time to rise from 10% to 50% than it did to go from 50% to 90%. This was different from the situation without hydrogen injection, where time required for both was similar. The hydrogen flame jet was shuttle-shaped when touching the lower surface owing to the rapid combustion speed of hydrogen, while the ammonia flame jet was spindle-shaped with the flame kernel in the center. The combustion process of the flame jet igniting the mixture exhibited two peaks in the heat release rate, reflecting two combustion stages dominated by the flame jet and flame propagation.
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在预转化炉中使用火焰喷射点燃氨/空气混合物(有氢气喷射和无氢气喷射)的燃烧特性
氨是可促进实现碳中和的重要燃料之一,但其燃烧特性不利于在发动机中应用。在前腔喷射氢气形成火焰射流来点燃氨气/空气混合物是一种改善氨气燃烧的方法。通过恒容燃烧室、高速摄像机观察和主燃烧室压力分析对这种点火方法进行了研究。火焰行为和燃烧特性与氨火焰喷射点燃的火焰行为和燃烧特性进行了比较。氢火焰喷射大大增强了混合气的燃烧,并延长了贫燃极限。在氢喷射条件下,压力上升延迟和燃烧持续时间更短,平均放热率更高,燃烧过程更稳定。氢火焰射流迅速穿透主腔并撞击下表面,产生强烈的湍流。因此,燃烧压力从 10% 上升到 50% 所需的时间比从 50% 上升到 90% 所需的时间要短。这与没有氢气喷射的情况不同,在没有氢气喷射的情况下,两者所需的时间相似。由于氢气燃烧速度快,氢气火焰射流在接触下表面时呈梭形,而氨气火焰射流呈纺锤形,火焰核位于中心。火焰射流点燃混合物的燃烧过程在放热率上表现出两个峰值,反映了火焰射流和火焰传播为主的两个燃烧阶段。
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来源期刊
Fuel
Fuel 工程技术-工程:化工
CiteScore
12.80
自引率
20.30%
发文量
3506
审稿时长
64 days
期刊介绍: The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.
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