A laminar flame speed correlation of hydrogen–methanol blends valid at engine-like conditions

Abstract

The hydrogen addition is effective on improving the performance of spark-ignited (SI) methanol engines. However, there is still a lack of laminar flame speed data of hydrogen–methanol blends at engine-like conditions. This blocks the combustion modeling of hydrogen-enriched methanol engines. In this paper, a laminar flame speed correlation of hydrogen–methanol blends was proposed for the computational fluid dynamics (CFD) simulation. This correlation was derived through 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 (400–2600 K), pressures (1–50 bar) and residual gas mass fractions (0–20%) were simultaneously considered in this correlation. The new correlation was implemented in the extended coherent flame model (ECFM) to evaluate its suitability for CFD simulation. Satisfying agreement between the experimental and calculated results was observed. This indicated that the new correlation was suitable for the CFD simulation of hydrogen-enriched methanol engines.