Understanding the antagonistic effect of methanol as a component in surrogate fuel models: A case study of methanol/n-heptane mixtures

Methanol is a widely used engine fuel, blend component, and additive. However, no systematic auto-ignition data or laminar flame speed measurements are available for kinetic studies of the effect methanol as blending additive component. In this work, both ignition delay times speeds pure methanol, n-heptane their blends at various ratios were measured engine-relevant conditions. Results show that increasing in promotes reactivity high temperatures inhibits it low temperatures, with crossover temperature occurring approximately 970–980 K being almost independent pressure. The experimental together those literature to validate NUIGMech1.1, which predicts well fuels over wide range Furthermore, analyses conducted reveal effects addition on oxidation pathways dominant reactions determining fuel reactivities. It found competition ȮH radicals between plays an important role temperatures. At produces higher concentrations HȮ2 produce two either through production H2O2 its subsequent decomposition direct reaction Ḣ atoms. This methanol/n-heptane mixtures speeds, respectively.