Interaction of flame instabilities and pressure behavior of hydrogen-propane explosion |
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| Institution: | 1. State Key Laboratory of coal mine disaster dynamics and control, Chongqing University, Chongqing 400044, PR China;2. School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, PR China;3. School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454003, PR China;1. East China University of Science and Technology, State Environmental Protection Key Laboratory of Risk Assessment and Control on Chemical Process, Shanghai, 200237, PR China;2. Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, PR China;3. Tianjin Fire Research Institute of MPS, Tianjin, 300381, PR China;1. School of Safety Science & Engineering, Xi’an University of Science and Technology, 58, Yanta Mid. Rd., Xi’an 710054, Shaanxi, PR China;2. Shaanxi Key Laboratory of Prevention and Control of Coal Fire, 58, Yanta Mid. Rd, Xi''an 710054, Shaanxi, PR China;3. Shaanxi Engineering Research Center for Industrial Process Safety & Emergency Rescue, 58, Yanta Mid. Rd., Xi''an 710054, Shaanxi, PR China;4. Postdoctoral Program, School of Energy, Xi’an University of Science and Technology, 58, Yanta Mid. Rd., Xi’an 710054, Shaanxi, PR China |
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| Abstract: | The flame destabilization mechanism of hydrogen-propane-air mixture is firstly revealed. The effects of unstable flame formation on pressure rise rate and burning rate are quantified. Finally, the theoretical prediction of explosion pressure behavior is performed by considering diffusive-thermal and hydrodynamic instability. The results demonstrated that before the explosion pressure starts to climbe, as the propane fraction increases, the effective Lewis number of lean and stoichiometric mixture undergoes the transition from Leeff < 1.0 to Leeff > 1.0, the stabilizing effect of diffusive-thermal instability continues to reduce for the rich mixture. After the explosion pressure starts to climbe, the hydrogen-propane flame becomes more unstable, which is mainly attributed to enhancing hydrodynamic instability. The maximum rate of pressure rise and burning rate should be augmented by unstable flame formation, the flame instabilities must be considered in the explosion pressure evaluation. |
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| Keywords: | Flame instabilities Explosion pressure behavior Maximum pressure rise rate Burning rate |
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