Computational investigation of non-premixed hydrogen-air laminar flames |
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| Affiliation: | 1. Center of Flow Simulation (CFS), Department of Mechanical and Process Engineering, Düsseldorf University of Applied Sciences, Münsterstraße 156, D-40476 Düsseldorf, Germany;2. Department of Mechanical Engineering, İzmir Institute of Technology, Gülbahçe, TR-35430 Urla/İzmir, Turkey;1. College of Mechanical & Electrical Engineering, Shaanxi University of Science & Technology, Xi''an, Shaanxi, 710021, China;2. Shaanxi Key Laboratory of Industrial Automation, Shaanxi University of Technology, Hanzhong, Shaanxi, 723001, China;1. China University of Petroleum (East China), College of Pipeline and Civil Engineering, Qingdao, 266580, China;2. Shandong Provincial Key Laboratory of Oil and Gas Storage and Transportation Safety, Qingdao, 266580, China;3. College of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, China;4. Institute of Porous Flow & Fluid Mechanics, Chinese Academy of Sciences, Langfang, 065007, China;1. School of Mechanical Engineering, Vellore Institute of Technology, Vellore, India;2. Automotive Research Centre, Vellore Institute of Technology, Vellore, India |
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| Abstract: | Laminar diffusion hydrogen/air flames are numerically investigated. Detailed and global mechanisms are compared. NO formation is modelled by full nitrogen chemistry and the extended Zeldovich mechanism. A satisfactory agreement between the present predictions and the experiments of other authors is observed. Significance of different ingredients of mathematical modelling is analyzed. Minor roles of thermal diffusion and radiation, but a significant role of buoyancy is observed. It is observed that the full and quasi multi-component diffusion deliver the same results, whereas assuming Le = 1 to a remarkable difference. NO emissions logarithmically increase with increasing residence time. NO is the dominating nitrogen oxide. Its share increases with residence time, whereby NO2 and N2O show a reverse trend. It is observed that the NNH route plays a remarkable role in NO formation, where the share of the Zeldovich mechanism increases with residence time from about 20% to 85%, within the considered range. |
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| Keywords: | Hydrogen combustion Non-premixed combustion Laminar flames Reaction mechanisms Nitrogen oxide formation |
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