Abstract
Infrared visualization was employed to observe the decay of a hydrogen-air flame front propagating in a narrow gap similar to a Hele-Shaw cell. Based on the images, the flame front speeds and sizes for mixtures with hydrogen concentrations of 7 % and 10 % by volume in gaps with widths of 3–5 mm were calculated. The shapes of the individual cells formed were determined, the mechanism of flame front decay due to the critical influence of diffusive-thermal instability was described, and a criterion for flame front decay was proposed. The obtained results may be used in the design of fuel cells and MEMS hydrogen devices to ensure the safety of their operation.
Published Version
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