Three-stage auto-ignition of n-heptane and methyl-cyclohexane mixtures at lean conditions in a flat piston rapid compression machine

AlRamadan, Abdullah S.; Houidi, Moez Ben; Sotton, Julien; Bellenoue, Marc; Johansson, Bengt; Sarathy, S. Mani

doi:10.1016/j.proci.2020.05.038

Cited by 3 publications

(1 citation statement)

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“…In general, binary mixed fuel can potentially provide a better representation of autoignition delay properties than those on the basis of a single fuel. In order to simulate the diesel C/H ratio and the physical and chemical properties in the actual autoignition process as accurately as possible, binary mixed fuel becomes a hot topic in diesel IDT research [13][14][15][16][17][18][19], especially toluene reference fuels (TRFs) [20][21][22][23]. Therefore, the IDT of 70% n-heptane/30% toluene under the CO 2 /O 2 atmosphere needs to be further investigated to provide a reference for the optimized design of future diesel engines.…”

Section: Introductionmentioning

confidence: 99%

Effects of High-Concentration CO2 on Ignition Delay Time of 70% n-Heptane/30% Toluene Mixtures

et al. 2022

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In order to research the high-concentration CO2 effects on ignition delay time (IDT) of diesel surrogate fuel (70% n-heptane/30% toluene), a carbon dioxide effect (CDE) model is established, which considers fuel and ambient gas concentration, density, and temperature influence on autoignition under CO2/O2 atmosphere. Firstly, a chemical model of n-heptane/toluene is established, and the coupling, reduction, and simulation processes are carried out in chemical kinetic software with the IDT as the target parameter. Secondly, a constant volume combustion chamber (CVCC) visualization platform is built by incorporating a high-speed camera system and different working conditions are set in the CO2 volume fraction range (40%-70%) at 3.0 MPa and 850 K for an autoignition experiment. Thirdly, experiment and simulation results are discussed in air, 60% CO2/40% O2, 50% CO2/50% O2, and 40% CO2/60% O2 atmospheres, including the IDT, CO2 effects, temperature sensitivity, and OH radical rate of production (ROP). The results show that the CDE model well predicts the 70% n-heptane/30% toluene IDT under the CO2/O2 atmosphere and the average error in 60% CO2/40% O2 atmosphere is 5.29%. Besides, when the CO2 volume fraction increases from 40% to 60%, the CO2 thermal effect plays a leading role in the IDT prolongation and the OH radical ROP peak of R4 (O+H2O⟶2OH) decreases by 180%.

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