Premixed Hydrogen/air Flame in Ceramic Granular Bed. (August 2015)

• Record Type: Journal Article
• Authors: Yang, S.I.; Lin, S.C.
• Is Part Of: Energy procedia. Volume 75(2015)
• Page Start: 2033
• Page End: 2037
• Publication Date: 2015-08
• Subjects: Hydrogen -- porous medium -- mild combustion -- feedback combustion -- high-temperature combustion; Power resources -- Congresses; Power resources -- Periodicals; Power resources; Conference proceedings; Periodicals; 333.7905
• DOI: 10.1016/j.egypro.2015.07.269
• Languages: English
• ISSNs: 1876-6102

Abstract

Abstract: This study investigates the characteristics of a lean premixed hydrogen/air flame in a ceramic granular bed (CGB) by conducting experimental measurements and numerical simulations. The experimental results show that the operating range (equivalence ratio, ϕ = 0.2–0.4) of CGBs for flame propagation is smaller than that of free flame due to the laminar flame speed ( S L ), reactivity, and firing rate ( Γ ) of H2 . In addition, flame temperature ( T f ) increases with increasing Γ, but decreases with increasing ϕ . Furthermore, S ab / S L decreases with increasing u ɛ / S L by the fuel characteristic of Hydrogen (H2 ) and heat recirculation in the CGB. The numerical simulation results show that the flame reaction zone in the CGB (porosity, ɛ = 0.33) is greater than that of free flame ( ɛ = 1) because H2 reacts early and changes the flame propagation characteristics.