Experimental and modeling study on the ignition delay times of ammonia/methane mixtures at high dilution and high temperatures |
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| Institution: | 1. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan, 430074, PR China;2. Dongguan Songshan Lake Hi-Tech Industrial Development Zone Science and Technology Education Bureau, PR China;1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi''an Jiaotong University, Xi''an, China;2. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China;1. State Key Laboratory of Power Systems, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, PR China;2. Advanced Propulsion Laboratory, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, PR China;3. School of Control and Computer Engineering, North China Electric Power University, Beijing 102206, PR China;1. Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan;2. Department of Aerospace Engineering, Tohoku University, 6-6-01 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan;3. College of Physical Sciences and Engineering, Cardiff University, Queen''s building, Cardiff CF24 3AA, United Kingdom;4. Department of Mechanical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;1. Department of Physical Chemistry, Physikalisch-Technische Bundesanstalt, Braunschweig, Germany;2. Institute of Internal Combustion Engines, Technische Universität Braunschweig, Braunschweig, Germany |
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| Abstract: | Ammonia is a promising alternative clean fuel due to its carbon-free character and high hydrogen density. However, the low reactivity of ammonia and the potential high NOx emissions hinder its applications. Blending methane into ammonia can effectively improve the reactivity of pure NH3. In addition, lean combustion, as a high-efficiency and low-pollution combustion technology, is an effective measure to control the potential increase in NOx emissions. In the present work, the ignition delay times (IDTs) of NH3/CH4 mixtures highly diluted in Ar (98%) with CH4 mole fractions of 0%, 10%, and 50% were measured in a shock tube at an equivalence ratio of 0.5, pressures of 1.75 and 10 bar and a temperature range of 1421 K - 2149 K. A newly comprehensive kinetic model (named as HUST-NH3 model) for the NH3/CH4 mixtures oxidation was developed based on our previous work. Four kinetic models, the HUST-NH3 model, Glarborg model 19], Okafor model 7], and CEU model 10], were evaluated against the ignition delay times, laminar flame speeds, and species profiles of pure ammonia and ammonia/methane mixtures from the present work and literature. The simulation results indicated that the HUST-NH3 model shows the best performance among the above four models. Kinetic analysis results indicated that the absence of NH3 + M = NH2 + H + M (R819) and N2H2 + M = H + NNH + M (R902) in the CEU model and Okafor model cause the deviations between the experimental and simulation results. The overestimation of the rate constants of NH2 + NO = NNH + OH (R838) in the Glarborg model is the main reason for the overprediction of the NH3 laminar flame speeds. |
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