Experimental study of the effect of structural differences in the composition of kerosene-like blended fuels on low-temperature autoignition in a constant volume combustion chamber

Zhang, Qiaosheng; Han, Yongqiang; Zhang, Kechao; Xu, Linxun; Sun, Xingyu; Jia, Dandan

doi:10.1016/j.joei.2023.101451

Cited by 3 publications

(1 citation statement)

References 40 publications

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“…Moreover, the HRR is a critical flame parameter that describes the net energetic output of total combustion . The HRR is also an essential property for determining high-energy flame regions. − Figure compares peak-[H + O + OH]-ROP and HRR at different ϕ and P 0 , where peak-[H + O + OH]-ROP denotes the sum of the individual peak ROP of radicals (H/O/OH). The peak-[H + O + OH]-ROP and HRR are linearly correlated with P 0 at a given ϕ.…”

Section: Resultsmentioning

confidence: 99%

Laminar Combustion Characteristics of Spherically Propagating Ethyl Methyl Carbonate Flames

Zhang,

Zheng,

Wang

et al. 2024

Energy Fuels

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The laminar combustion characteristics of ethyl methyl carbonate flames were investigated at initial pressures of 70–130 kPa, equivalence ratios of 0.6–1.4, and an initial temperature of 373 K using a 36 L constant volume combustion chamber. The Grégoire mechanism well predicts the laminar burning velocity, pressure power exponent, and isochoric combustion pressure. The laminar burning velocity of ethyl methyl carbonate increases from 25.99 to 49.21 cm/s at an initial pressure of 100 kPa as the equivalence ratio increases from 0.6 to 1.0. Moreover, the Jin method, which assumes that one mole of ethyl methyl carbonate is decomposed into 2 mol of CH4, 1 mol of CO, and 1 mol of CO2, cannot accurately predict the laminar burning velocity of the mixtures. The pressure power exponent indicates that the pressure dependence is more inconspicuous for the mixtures near the stoichiometric ratio. The maximum isochoric combustion pressure and maximum rate of pressure rise vary nonmonotonically with the equivalence ratio, reaching a maximum at ϕ = 1.2. Empirical expressions for the experimentally obtained combustion characteristics as a function of the initial pressure and equivalence ratio were established. The reactions R806: CCOC*OOC = C2H4 + COC*OOH and R797: CCOC*OOC + H = CCJOC*OOC + H2 had the greatest effect on promoting and inhibiting the laminar burning velocity in the decomposition reaction, respectively. The sum of the peak mole fractions of H/O/OH radicals, the sum of the rate of production of the key radicals, and the heat release rate all reach their maximum values at ϕ = 1.1. The reactivity of ethyl methyl carbonate is mainly controlled by reactions involving COC*OOH. The maximum rate of pressure rise can be predicted by the sum of the peak rate of H/O/OH radical production or the heat release rate.

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Section: Resultsmentioning

confidence: 99%

Laminar Combustion Characteristics of Spherically Propagating Ethyl Methyl Carbonate Flames

Zhang,

Zheng,

Wang

et al. 2024

Energy Fuels

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Experimental and modeling study of the effect of cetane improver-coupled EGR on RP-3 kerosene spray ignition and emissions

Zhang,

Han,

Zhang

et al. 2024

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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Spray Autoignition Study of Bio-Oxygenated Additives Blended With Aviation Kerosene Under Engine-Like Cold-Start Conditions

Zhang,

Han,

Zhang

et al. 2024

Journal of Energy Resources Technology

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Bio-oxygenated fuels are expected to be used as a clean alternative energy source to improve the ignition behavior and pollutant emissions of RP-3 kerosene in compression ignition engines. In this study, the spray autoignition of PR-3 blended with different types of oxygenated fuels (including n-pentanol (PeOH), methyl propionate (MP), methyl ethyl ketone (MEK), 1,2-dimethoxyethane (1,2-DME), and 2-Ethylhexyl nitrate (EHN)) was measured using a constant-volume combustion chamber. Experiments were performed on three sets of blended fuels with different oxygen contents (2.5 wt%, 5 wt%, 10 wt%) in the temperature range of 723∼863 K and at ambient pressures of 2.2 and 4 MPa. A kinetic analysis utilized a merged RP-3 low-temperature kinetic model containing various oxygenated components. The ignition delay of blended fuels increases with the addition of PeOH, MP, and MEK, particularly PeOH, which demands more energy absorption at low temperatures due to its higher specific heat and latent heat of vaporization. As ambient pressure increased, the ignition delay period shortened for all blended fuels; however, PeOH and MEK demonstrated more significant low-temperature suppression. The combined kinetic model can reasonably predict the trend of the effect of oxygenated additives. 1,2-DME showed significantly more low-temperature reactivity versus PeOH, MP, and MEK. The variability is because the products of secondary O2 addition and isomerization of 1,2-DME undergo low-temperature branched chain reactions, but other oxygenated fuels produce more inert components.

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Experimental study of the effect of structural differences in the composition of kerosene-like blended fuels on low-temperature autoignition in a constant volume combustion chamber

Cited by 3 publications

References 40 publications

Laminar Combustion Characteristics of Spherically Propagating Ethyl Methyl Carbonate Flames

Laminar Combustion Characteristics of Spherically Propagating Ethyl Methyl Carbonate Flames

Experimental and modeling study of the effect of cetane improver-coupled EGR on RP-3 kerosene spray ignition and emissions

Spray Autoignition Study of Bio-Oxygenated Additives Blended With Aviation Kerosene Under Engine-Like Cold-Start Conditions

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