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Extinction Characteristics of Catalyst-assisted Combustion in a Stagnation-point Flow Reactor by Jingjing Li; Hong G. Im is a Engineering article available to read on EtoBox.

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As a fundamental study to understand physical and chemical characteristics in catalyst-assisted combustion, numerical simulations of a stagnation-point flow combustor with a catalytic surface are performed. The combustible mixture of methane and air is blown on top of a platinum surface, forming a classical stagnation-point flow configuration. This geometry not only represents an on-chip microcombustor considered in recent studies, but it also serves as a canonical problem of combined heterogeneous/homogeneous combustion subjected to flow straining, which is a key parameter that governs the quenching and flammability limit. One-dimensional similarity formulation is derived with full consideration of detailed surface and gas-phase chemical kinetic models. Parametric studies are conducted to investigate the effects of strain rate, equivalence ratio, heat loss on the combustion, and extinction modes. The steady results showed that catalysis can largely extend the extinction limit, while suppressing the gas-phase reaction at lower strain rates. It was also found that the extension of the catalytic reaction quenching limit is sensitive to the mixture composition, suggesting the dominanc

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Author

Jingjing Li; Hong G. Im

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0010-2180)

Published

2006

Language

EN

Field

Engineering (Physical Sciences)