Distinct combustion characteristics of a one-dimensional premixed laminar flame of ammonia under various combustion regimes  

作　　者：Xiangtao Liu Guochang Wang Jicang Si Pengfei Li Mengwei Wu Jianchun Mi 

机构地区：[1]College of Engineering,Peking University,Beijing 100871,China [2]State Key Laboratory of Clean and Efficient Coal Utilization,Taiyuan University of Technology,Taiyuan 030024,China [3]State Key Laboratory of Coal Combustion,School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China [4]Marine Engineering College,Dalian Maritime University,Dalian 116026,China

出　　处：《Carbon Resources Conversion》2024年第4期85-95,共11页碳资源转化(英文)

基　　金：support of National Natural Science Foundation of China(Nos.51776003,52076095 and 52206145).

摘　　要：The present study numerically investigates the distinct combustion characteristics of a one-dimensional premixed laminar flame of gaseous ammonia under traditional, MILD, and high-temperature combustion regimes. Specifically, we examine the flames diluted by N_(2) and H_(2)O, respectively, analyzing the flame structure, heat release rate, temperature, main species concentrations, and NO_(x) emissions. The fictitious gaseous diluents of FH_(2)O and FN_(2) are applied to quantitatively distinguish physical and chemical effects. Results show that the chemical effect of dilution by N_(2) is negligible while both physical and chemical effects by H_(2)O dilution significantly increase the flame thickness and hence reduce the heat release rate and temperature. Furthermore, both effects of H_(2)O dilution diminish as the burning regime transitions from MILD to traditional or high-temperature combustion. In particular, the H_(2)O dilution physically reduces the concentrations of the main species. On the other hand, the chemical effect raises the concentrations of H_(2), OH, and NO in the traditional and high-temperature combustion, contrasting to that under the MILD regime. As for NO_(x) emissions, the H_(2)O dilution reduces NO emission in the MILD and high-temperature combustion but influences negligibly in traditional combustion. Additionally, the chemical effect of H_(2)O shows a contrasting influence on the NO emission under the MILD and high-temperature regimes. Comprehensive explanations are provided for the observed phenomena, shedding light on the intricate interplay of dilution and combustion.

关 键 词：Ammonia fuel MILD combustion Premixed laminar flame Numerical simulation 

分 类 号：TK1[动力工程及工程热物理—热能工程]