An initial step in the experimental characterization of ultra-lean hydrogen/air turbulent spherical flames for internal combustion engine applications - Archive ouverte HAL
Communication Dans Un Congrès Année : 2024

An initial step in the experimental characterization of ultra-lean hydrogen/air turbulent spherical flames for internal combustion engine applications

Résumé

Kick-starting the decarbonization of the heavy-duty transport sector is vital to slowdown global warming. The use of green e-fuel such as hydrogen for spark ignition engine applications is currently a promising solution. In order to mitigate pollutant emissions, these engines are designed to operate with low volumetric hydrogen content. However, under these conditions, the flame propagation is subject to intrinsic instabilities. Very few studies characterize ultra-lean premixed turbulent flame propagation, especially due to a lack of unambiguous definitions of hydrogen combustion fundamental properties such as laminar flame thickness and speed. To the best of the authors’ knowledge, the first turbulent flame speed measurements are presented for ultra-lean hydrogen/air mixtures, under spark ignition engine conditions. Literature correlations considering important turbulent combustion parameters were appraised at engine-like conditions (high pressure and temperature). The results shows that turbulent flame speed increases with increasing volumic hydrogen content, pressure and turbulence intensity. A correlation taking into account preferential diffusion effect, dimensionless Karlovitz and Damkohler numbers was validated on present¨ experiments and literature datasets. As a matter of fact, including the interaction of the multi-scale turbulent vortex with the flame front is important in order to characterize the propagation of such thermo-diffusionally unstable turbulent flames. The conclusions of this work are relevant to the modeling of ultra-lean turbulent premixed hydrogen/air flames and thus of practical necessity.
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Dates et versions

hal-04575942 , version 1 (15-05-2024)

Identifiants

  • HAL Id : hal-04575942 , version 1

Citer

Nicolas Villenave, Pierre Brequigny, Fabrice Foucher. An initial step in the experimental characterization of ultra-lean hydrogen/air turbulent spherical flames for internal combustion engine applications. 3rd Low Carbon Combustion Meeting, Apr 2024, Nancy, France. ⟨hal-04575942⟩
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