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Numerical investigations on flashback dynamics of premixed methane-hydrogen-air laminar flames
Injecting hydrogen into the natural gas network to reduce CO2 emissions in the EU residential sector is considered a critical element of the zero CO2 emissions target for 2050. Burning natural gas and hydrogen mixtures has potential risks, the main one being the flame flashback phenomenon that could occur in home appliances using premixed laminar burners. In the present study, two-dimensional transient computations of laminar CH4- + air and CH4 + H-2 + air flames are performed with the open-source CFD code OpenFOAM. A finite rate chemistry based solver is used to compute reaction rates and the laminar reacting flow. Starting from a flame stabilized at the rim of a cylindrical tube burner, the inlet bulk velocity of the premixture is gradually reduced to observe flashback. The results of the present work concern the effects of wall temperature and hydrogen addition on the flashback propensity of laminar premixed methane-hydrogen-air flames. Complete sequences of flame dynamics with gradual increases of premixture velocity are investigated. At the flame flashback velocities, strong oscillations at the flame leading edge emerge, causing broken flame symmetry and finally flame flashback. The numerical results reveal that flashback tendency increase with increasing wall temperature and hydrogen addition rate. (C) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
Numerical investigations on flashback dynamics of premixed methane-hydrogen-air laminar flames
Injecting hydrogen into the natural gas network to reduce CO2 emissions in the EU residential sector is considered a critical element of the zero CO2 emissions target for 2050. Burning natural gas and hydrogen mixtures has potential risks, the main one being the flame flashback phenomenon that could occur in home appliances using premixed laminar burners. In the present study, two-dimensional transient computations of laminar CH4- + air and CH4 + H-2 + air flames are performed with the open-source CFD code OpenFOAM. A finite rate chemistry based solver is used to compute reaction rates and the laminar reacting flow. Starting from a flame stabilized at the rim of a cylindrical tube burner, the inlet bulk velocity of the premixture is gradually reduced to observe flashback. The results of the present work concern the effects of wall temperature and hydrogen addition on the flashback propensity of laminar premixed methane-hydrogen-air flames. Complete sequences of flame dynamics with gradual increases of premixture velocity are investigated. At the flame flashback velocities, strong oscillations at the flame leading edge emerge, causing broken flame symmetry and finally flame flashback. The numerical results reveal that flashback tendency increase with increasing wall temperature and hydrogen addition rate. (C) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
Numerical investigations on flashback dynamics of premixed methane-hydrogen-air laminar flames
2022-07-01
47
Article (Journal)
Electronic Resource
English
Energy in Agriculture , Agriculture , FİZİKSEL , Tarım Makineleri , ENERJİ VE YAKITLAR , Farm Machinery , Yüzeyler , PHYSICAL , ELEKTROKİMYA , ENGINEERING , Tarımsal Bilimler , KİMYA , Fizikokimya , Yüzeyler ve Arayüzler , Enerji Mühendisliği ve Güç Teknolojisi , Enerji (çeşitli) , Natural Sciences , Agricultural Sciences , Kimya (çeşitli) , ENERGY & FUELS , Fiziksel ve Teorik Kimya , Mühendislik ve Teknoloji , Genel Mühendislik , Ziraat , Yakıt Teknolojisi , Natural Sciences (SCI) , Mühendislik (çeşitli) , Mühendislik , Bilişim ve Teknoloji (ENG) , Elektrokimya , Sürdürülebilirlik ve Çevre , Temel Bilimler , Yenilenebilir Enerji , Temel Bilimler (SCI) , Genel Enerji , Biyoyakıt Teknolojisi , Kaplamalar ve Filmler , Physical Chemistry , Engineering and Technology , Biofuels Technology , Electrochemistry , Computing & Technology (ENG) , Kimya , Chemistry , Tarımda Enerji
DDC:
690
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