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Lean hydrogen-air premixed flame with heat loss
Affiliation:1. Physical Gasdynamics Department, Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow, 125412, Russia;2. National Research Center “Kurchatov Institute”, Moscow, 123182, Russia;3. Bauman Moscow State Technical University, Moscow, 105005, Russia;1. CNR-ISC, U.O.S. Sapienza, Piazzale A. Moro 5, 00185, Roma, Italy;2. Dipartimento di Chimica, Università di Roma La Sapienza, Piazzale Aldo Moro 5, 00185, Roma, Italy;3. Dipartimento Fusione e Tecnologie per la Sicurezza Nucleare, ENEA, Via E. Fermi 45, 00044, Frascati, (RM), Italy;1. College of Safety Science and Engineering, Nanjing Tech University, Nanjing, 210009, China;2. Institute of Nuclear and Energy Technologies, Karlsruhe Institute of Technology, Karlsruhe, 76021, Germany;3. Changzhou University, Changzhou, 213016, China;1. College of Safety Science and Engineering, Xi''an University of Science and Technology, 58, Yanta Mid. Rd., Xi''an 710054, Shaanxi, China;2. Shaanxi Key Laboratory of Prevention and Control of Coal Fire, 58, Yanta Mid. Rd, Xi''an 710054, Shaanxi, China;3. Xi''an University of Science and Technology, Xi’an 710054, Shaanxi, China;1. Southeast University Research Center of State Key Lab of Technology Space Cryogenic Propellants, Nanjing, 210096, China;2. School of Energy and Environment, Southeast University, Nanjing, 210096, China;3. State Key Laboratory of Technologies in Space Cryogenic Propellants, Beijing, 100028, China
Abstract:In this paper results of large-scale experiments and numerical simulations of premixed lean hydrogen-air spherical flame propagation with and without high heat losses are presented. Experiments were carried out in a cylindrical volume of 4.5 m3 covered with thin polyethylene film. The heat loss surface is a 50 mm layer of steel wool. Analysis of heat loss effect on combustion products expansion and flame surface density is done. The combination of these parameters governs the manner in which the flame accelerates. It is shown that the loss of heat released at the combustion can significantly reduce the speed of flame propagation and suppress the acceleration of the flame front. Comparison of experimental results and numerical simulations are presented. The subject and results of the study are of critical importance for the industrial explosion safety and may be applied in the areas of internal combustion engines and detonation suppression devices.
Keywords:Premixed lean hydrogen-air flame  Numerical simulations  Heat losses  Steel wool experiments  Gas explosions
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