Combustion Characteristics of Premixed Hydrogen/Air in an Undulate Microchannel

Pedro R. Resende, Leandro C. Morais, Carlos Pinho and Alexandre M. Afonso
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Pedro R. Resende: proMetheus, Escola Superior de Tecnologia e Gestão, Instituto Politécnico de Viana do Castelo, 4900-347 Viana do Castelo, Portugal
Leandro C. Morais: Institute of Science and Technology, São Paulo State University (Unesp), Sorocaba 18087-180, Brazil
Carlos Pinho: CEFT, Department of Mechanical Engineering, University of Porto, 4200-465 Porto, Portugal
Alexandre M. Afonso: CEFT, Department of Mechanical Engineering, University of Porto, 4200-465 Porto, Portugal

Energies, 2022, vol. 15, issue 2, 1-15

Abstract: This work reports a numerical investigation of microcombustion in an undulate microchannel, using premixed hydrogen and air to understand the effect of the burner design on the flame in order to obtain stability of the flame. The simulations were performed for a fixed equivalence ratio and a hyperbolic temperature profile imposed at the microchannel walls in order to mimic the heat external losses occurred in experimental setups. Due to the complexity of the flow dynamics combined with the combustion behavior, the present study focuses on understanding the effect of the fuel inlet rate on the flame characteristics, keeping other parameters constant. The results presented stable flame structure regardless of the inlet velocity for this type of design, meaning that a significant reduction in the heat flux losses through the walls occurred, allowing the design of new simpler systems. The increase in inlet velocity increased the flame extension, with the flame being stretched along the microchannel. For higher velocities, flame separation was observed, with two detected different combustion zones, and the temperature profiles along the burner centerline presented a non-monotonic decrease due to the dynamics of the vortices observed in the convex regions of the undulated geometry walls. The geometry effects on the flame structure, flow field, thermal evolution and species distribution for different inlet velocities are reported and discussed.

Keywords: numerical study; microcombustion; hydrogen; complex geometry (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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