Numerical study of the effect of obstacles on the spontaneous ignition of high-pressure hydrogen |
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| Affiliation: | 1. JAXA''s Engineering Digital Innovation Center, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuuou, Sagamihara, Kanagawa 252-5210, Japan;2. School of Engineering, University of Tokyo, 2-11-16 Yayoi, Bunkyo, Tokyo 113-0032, Japan;3. Graduate School of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya, Yokohama, Kanagawa 240-8501, Japan;1. JAXA''s Engineering Digital Innovation Center, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuuou, Sagamihara, Kanagawa 252-5210, Japan;2. School of Engineering, University of Tokyo, 2-11-16 Yayoi, Bunkyo, Tokyo 113-0032, Japan;3. Graduate School of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya, Yokohama, Kanagawa 240-8501, Japan;1. LIG Nex1 Co., Ltd., PGM R&D Lab., Gyeonggi, Republic of Korea;2. Department of Mechanical and Aerospace Engineering, Institute of Advanced Aerospace Technology, Seoul National University, Seoul 151-744, Republic of Korea;1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, Anhui, People''s Republic of China;2. Department of Aerospace Engineering, University of Maryland, College Park, MD 20742, USA;3. School of Chemical Machinery, Dalian University of Technology, Dalian, Liaoning 116024, People''s Republic of China;1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, PR China;2. Department of Aerospace Engineering, University of Maryland, College Park, MD 20742, USA;3. Institute of Fluid Science, Tohoku University, Sendai, Miyagi 980-8577, Japan;1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, 230026, People’s Republic of China;2. Department of Aerospace Engineering, University of Maryland, College Park, MD, 20742, USA;3. Dalian University of Technology, Dalian, 116024, People’s Republic of China |
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| Abstract: | A numerical simulation of the spontaneous ignition of high-pressure hydrogen in a duct with two obstacles on the walls is conducted to explore the spontaneous ignition mechanisms. Two-dimensional rectangular ducts are adopted, and the Navier–Stokes equations with a detailed chemical kinetic mechanism are solved by using direct numerical simulations. In this study, we focus on the effects of the initial pressure of hydrogen and the position of the obstacles on the ignition mechanisms. Our results demonstrate that the presence of obstacles significantly changes the spontaneous ignition mechanisms producing three distinct ignition mechanisms. In addition, the position of the obstacles drastically changes the interaction of shock waves with the contact surface, and spontaneous ignition may take place at a relatively low pressure in some obstacle positions, which is attributed to the propagation direction and interaction timing of two reflected shock waves. |
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| Keywords: | Spontaneous ignition Hydrogen safety Detailed chemical kinetic model Computational fluid dynamics |
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