Development and validation of a laminar flame speed correlation for the CFD simulation of hydrogen-enriched gasoline engines

In this paper, a laminar flame speed correlation was developed and validated for the computational fluid dynamics (CFD) simulation of hydrogen-enriched gasoline engines. This correlation was derived through the tabulated data which was determined by a self-developed calculation program according to the flame temperature-based mixing rule. Wide ranges of hydrogen volume fractions (0–10%), equivalence ratios (0.6–1.5), unburned gas temperatures (300–2500 K), pressures (1–50 bar) and residual gas mass fractions (0–20%) were simultaneously considered in this correlation to cover the burning conditions encountered in SI engines. The estimated values of the new correlation were found to be in satisfying agreement with the experimental data under normal burning conditions. Moreover, the new correlation was implemented in the extended coherent flame model to evaluate its suitability for CFD simulation. Satisfying agreement between the experimental and calculated results was observed under all examined hydrogen addition levels. This indicated that the new correlation was suitable for the CFD simulation of hydrogen-enriched gasoline engines.