Shock tube study of the interaction between ammonia and nitric oxide at high temperatures using laser absorption spectroscopy |
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| Institution: | 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. Key Laboratory for Power Machinery and Engineering of MOE, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Institute of Thermal Engineering, Technische Universität Bergakademie Freiberg, Freiberg D-09599, Germany;1. State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China;2. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, China;3. Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China;4. Dalian National Laboratory for Clean Energy, Dalian 116023, China;1. Institute for Combustion and Gas Dynamics, Thermodynamics, University of Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany;2. J. Mike Walker ‘66 Department of Mechanical Engineering, Texas A&M University, 3123 TAMU, College Station, TX 77843, USA;1. Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States of America;2. High Temperature Gasdynamics Laboratory, Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, United States of America |
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| Abstract: | The interaction between ammonia (NH3) and nitric oxide (NO) at high temperatures is studied in this work using a shock tube combined with laser absorption diagnostics. The system simultaneously measured the NH3 and NO time-histories during the reaction processes of the shock-heated NH3/NO/CO/Ar mixtures (NH3:NO ≈ 0.9:1.0 and 1.4:1.0). The absorption cross-sections of NH3 near 1122.10 cm–1 and NO at 1900.52 cm–1 (characterized in this study) were used for measuring NH3 and NO time-histories with the temperature measured by two CO absorption lines. The measured NH3 and NO time-histories at 1614–1968 K and 2.4–2.8 atm were compared with predictions of seven recent kinetics models. The predictions that based on different mechanisms are very different and the measured profiles are within the range of the predictions. The Glarborg, NUI Galway Syngas-NOx, and Mathieu mechanisms give the closest predictions to the measurements. Kinetics analyses indicate that the NH3 and NO consumption rates are extremely sensitive to the rate constants and branching ratio of NH2 + NO = N2 + H2O and NH2 + NO = NNH + OH, which are more reliably represented in the Glarborg and NUI Galway Syngas-NOx mechanisms. The performances of Glarborg mechanisms at lower initial temperatures can be apparently improved by revising the rate constants and branching ratio of NH2 + NO = N2 + H2O and NH2 + NO = NNH + OH. These two reactions are also the primary pathways for NO reduction and NH3 is mainly consumed via NH3 + OH = NH2 + H2O and NH3 + H = NH2 + H2. Trace amounts of NO2 and N2O impurities decompose to form O radical followed by the generation of OH radical via H-abstraction reactions, which significantly affects the predictions of NH3 and NO according to kinetics analyses. |
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