Abstract
This study presents a simplified mechanism of a five-component gasoline surrogate fuel (TDRF–NO) that includes n-heptane, isooctane, toluene, diisobutylene (DIB) and nitric oxide (NO). The mechanism consists of 119 species and 266 reactions and involves TDRF and NO submechanisms. Satisfactory results were obtained in simulating HCCI combustion in engines. The TDRF submechanism is based on the simplified mechanism of toluene reference fuel (TRF) and adds DIB to form quaternary surrogate fuel for gasoline. A simplified NO submechanism containing 33 reactions was added to the simplified mechanism of TDRF, considering the effect of active molecular NO on the combustion of gasoline fuel. The ignition delay data of the shock tube under different pressure and temperature conditions verified the validity of the model. Model verification results showed that the ignition delay time predicted by the simplified mechanism and its submechanics were consistent with the experimental data. The addition of NO caused the ignition delay time of the mechanism simulation to advance with increasing concentration of NO added. The established simplified mechanism effectively predicted the actual combustion and ignition of gasoline.
Highlights
Compared with traditional compression ignition (CI) and spark ignition (SI) engines, homogeneous charge compression ignition (HCCI) engines have become a focus of research among internal combustion engines because of their efficient and clean combustion methods
A simplified toluene reference fuel (TRF) mechanism was constructed, characteristics of gasoline, and addition of nitric oxide (NO) can make the ignition delay time advance with the and the mechanism was verified under shock tube conditions [25]
The verification results showed that the model and experimental data had a good and the mechanism was verified under shock tube conditions [25]
Summary
Compared with traditional compression ignition (CI) and spark ignition (SI) engines, homogeneous charge compression ignition (HCCI) engines have become a focus of research among internal combustion engines because of their efficient and clean combustion methods. HCCI has problems, such as a narrow range of operating conditions, difficulty in catching fire and high HC and CO emissions in HCCI combustion. To solve these problems, scholars have adopted various advanced technologies such as intake air heating [2] and increasing the compression ratio of internal combustion engines [3], control strategy with dual fuel [4] and simulation of surrogate fuels [5]. The use of numerical simulation with chemical kinetics as the core is one of the most appropriate means to explore combustion mechanism and help achieve accurate control of HCCI. Using one or several components to describe the physicochemical properties of gasoline fuel has become a feasible research trend
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