Abstract
The requirements for improving the efficiency of internal combustion engines and reducing emissions have promoted the development of new combustion technologies under extreme operating conditions (e.g., lean combustion), and the ignition and combustion characteristics of fuels are increasingly becoming important. A chemical kinetic reduced mechanism consisting of 115 species and 414 elementary reactions is developed for the prediction of ignition and combustion behaviors of gasoline surrogate fuels composed of five components, namely, isooctane, n-heptane, toluene, diisobutylene, and cyclohexane (CHX). The CHX sub-mechanism is obtained by simplifying the JetSurF2.0 mechanism using direct relationship graph error propagating, rate of production analysis, and temperature sensitivity analysis and CHX is mainly consumed through ring-opening reactions, continuous dehydrogenation, and oxygenation reactions. In addition, kinetic parameter corrections were made for key reactions R14 and R391 based on the accuracy of the ignition delay time and laminar flame velocity predictions. Under a wide range of conditions, the mechanism’s ignition delay time, laminar flame speed, and the experimental and calculated results of multi-component gasoline surrogate fuel and real gasoline are compared. The proposed mechanism can accurately reproduce the combustion and oxidation of each component of the gasoline-surrogate fuel mixture and real gasoline.
Highlights
Strict emission regulations place higher requirements on internal combustion engine technology
The six-component diesel/gasoline-alternative fuel chemical kinetic model proposed by Raza et al [6] shows a good mechanism scale (168 species and 680 reactions) and was used to study the combustion characteristics of reactive control compression ignition (RCCI)
The proposed mechanism is evaluated with the ignition delay time, laminar flame velocity, and species distribution data measured in the literature
Summary
Strict emission regulations place higher requirements on internal combustion engine technology (high efficiency and low emissions). The fivecomponent gasoline-alternative fuel chemical kinetic model developed by Li et al [21] is composed of n-heptane, isooctane, toluene, DIB, and CHX to predict the ignition delay time. This model has been used many times to discuss the influence of gasoline components on the combustion and emissions of gasoline direct-injection engines [28,29], large-scale has caused difficulty in flame-speed verification and three-dimensional numerical simulation. The six-component diesel/gasoline-alternative fuel chemical kinetic model proposed by Raza et al [6] shows a good mechanism scale (168 species and 680 reactions) and was used to study the combustion characteristics of RCCI. The proposed mechanism is evaluated with the ignition delay time, laminar flame velocity, and species distribution data measured in the literature
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