Features of Hydrogen-Enriched Methane–Air Flames Propagating in Hele-Shaw Channels

Sergey Yakush (), Sergey Rashkovskiy, Maxim Alexeev and Oleg Semenov
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Sergey Yakush: Ishlinsky Institute for Problems in Mechanics RAS, 119526 Moscow, Russia
Sergey Rashkovskiy: Ishlinsky Institute for Problems in Mechanics RAS, 119526 Moscow, Russia
Maxim Alexeev: Department of Experimental Physics, Surgut State University, 628400 Surgut, Russia
Oleg Semenov: Department of Experimental Physics, Surgut State University, 628400 Surgut, Russia

Energies, 2025, vol. 18, issue 2, 1-20

Abstract: Mixtures of hydrogen with common hydrocarbon fuels are considered viable for reducing carbon footprint in modern industry, power production, and transportation. The addition of hydrogen alters the kinetics and thermophysical properties of the mixtures, as well as the composition and properties of combustion products, requiring detailed research into the features of flame propagation in hydrogen-enriched hydrocarbon–air mixtures. Of particular interest are also the safety aspects of such fuels. In this paper, experimental results are presented on the premixed laminar flame propagation in channels formed by two closely spaced plates (Hele-Shaw cell), with the internal straight walls forming a diverging (diffuser) channel with the opening angles between 5 and 25 degrees. Methane–hydrogen–air mixtures with the hydrogen relative contents of 0%, 25%, and 50% and global equivalence ratio of unity were ignited by a spark near the closed narrow end of the channel. Experiments were performed with the gap width of 3.5 mm; video recordings were processed in order to determine the quantitative features of the flame front propagation (leading and trailing point coordinate, coordinates of the cusps, cell sizes and shapes). The main features of flame propagation (fast initial expansion, development of cellular flame, self-induced longitudinal oscillations) are obtained and compared to clarify the effect of hydrogen contents in the fuel and channel geometry (gap width, opening angle).

Keywords: hydrogen; methane; premixed combustion; Hele-Shaw cell; diffuser channel; flame instability; cellular flame; experiments (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: 2025
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