Unexpected Propagation of Ultra-Lean Hydrogen Flames in Narrow Gaps
2020; American Physical Society; Volume: 124; Issue: 17 Linguagem: Inglês
10.1103/physrevlett.124.174501
ISSN1092-0145
AutoresFernando Veiga-López, М. Кузнецов, Daniel Martínez-Ruiz, Eduardo Fernández-Tarrazo, Joachim Grüne, Mario Sánchez–Sanz,
Tópico(s)Advanced Combustion Engine Technologies
ResumoVery lean hydrogen flames were thought to quench in narrow confined geometries. We show for the first time how flames with very low fuel concentration undergo an unprecedented propagation in narrow gaps: H2-air flames can survive very adverse conditions by breaking the reaction front into isolated flame cells that travel steadily in straight lines or split to perform a fractal-like propagation that resembles the pathway of starving fungi or bacteria. The combined effect of hydrogen mass diffusivity and intense heat losses act as the two main mechanisms that explain the experimental observations.Received 20 November 2019Accepted 26 March 2020DOI:https://doi.org/10.1103/PhysRevLett.124.174501© 2020 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasCombustionEnergy sourcesEngineeringFlow instabilityPatterns in complex systemsFluid DynamicsInterdisciplinary Physics
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