Effect of free-radical release on diesel ignition delay under simulated cold-starting conditions

Clothier, P.Q.E.; Moise, A.; Pritchard, H. O.

doi:10.1016/0010-2180(90)90022-j

Cited by 50 publications

(17 citation statements)

References 8 publications

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“…8 DEE, which is a low viscosity liquid, improves spray characteristics, thus enhancing combustion efficiency. 38 Furthermore, the addition of 5% DEE to diesel decreases its viscosity by 26%. 39 In addition, DEE reduces smoke invariably and slightly decreases NO x emissions for all blending proportions of DEE.…”

Section: Parameters Additive Selection and Their Levelmentioning

confidence: 99%

Simultaneous optimization of smoke and NO_x emissions in a stationary diesel engine fuelled with diesel–oxygenate blends using the grey relational analysis in the Taguchi method

Devarajan

Ravikumar²,

Babu³

2016

Anal. Methods

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Section: Parameters Additive Selection and Their Levelmentioning

confidence: 99%

Simultaneous optimization of smoke and NO_x emissions in a stationary diesel engine fuelled with diesel–oxygenate blends using the grey relational analysis in the Taguchi method

Devarajan

Ravikumar²,

Babu³

2016

Anal. Methods

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“…Clothier et al studied the effect of DEE on the ignition delay of a diesel engine under cold-starting conditions . They confirmed that diesel fuel doped with DEE lowers the cetane number and lengthens the ignition delay times (IDTs), which has a significant difference in contrast with using DEE alone.…”

Section: Introductionmentioning

confidence: 99%

Improved Kinetic Mechanism for Diethyl Ether Oxidation with a Reduced Model

et al. 2017

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An improved diethyl ether (DEE) reaction mechanism consisting of 174 species and 973 reactions has been proposed. The present model is derived from an original model of Yasunaga et al. [A multiple shock tube and chemical kinetic modeling study of diethyl ether pyrolysis and oxidationYasunagaK.GillespieF.SimmieJ. M.CurranH. J.KuraguchiY.HoshikawaH.YamaneM.HidakaY. Yasunaga, K. Gillespie, F. Simmie, J. M. Curran, H. J. Kuraguchi, Y. Hoshikawa, H. Yamane, M. Hidaka, Y. J. Phys. Chem. A201011490989109]. On the basis of shock tube results in the temperature range of 900–1900 K, pressure range of 1–40 bar, and equivalence ratios of 0.5–2 as well as rapid compression machine (RCM) measurements of a stoichiometric DEE/O2/inert gas mixture at temperatures of 500–900 K and pressures of 3–4 bar, the ignition delay times (IDTs) were validated. Two-stage ignition at temperatures below 650 K and negative temperature coefficient (NTC) behavior at temperatures between 621 and 746 K are observed. In addition, the freely propagating flame velocities of a stoichiometric DEE/air mixture were validated at various temperatures as well. Using directed relation graph (DRG)-based methods for the improved mechanism reduction, a reduced mechanism composed of 80 species and 329 reactions has been achieved. Calculations for IDTs, laminar flame velocities, and temperature and species profiles using the reduced mechanism show very close agreement with those obtained using the improved mechanism. Meanwhile, sensitivity analyses of the burning velocity and IDT for the improved and reduced mechanisms were performed. Competing reactions related to DEE + OH and consumption of C2H5OC2H4s and HO2 were identified as being important for IDTs at various temperatures.

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“…In addition, Figure is the schematic diagram of molecular structure for TBHP. As shown in the literatures, TBHP was an additive that could promote ignition characteristics and increase the cetane number of diesel, but the detailed acting mechanism of TBHP addition has been still unclear. Furthermore, as we known within our knowledge, there is a lack of study on other fuels with TBHP addition in literatures.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on ignition intensification of n‐butane with tert‐butyl hydroperoxide (TBHP) addition

et al. 2019

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Summary Aimed to intensify the ignition and combustion process of n‐butane fuel in micro internal combustion (IC) engines, ignition delay characteristics of n‐butane/air mixtures with tert‐butyl hydroperoxide (TBHP) addition ratios below 10% were investigated numerically by CHEMKIN‐PRO software. Results show that ignition delay times of n‐butane can be shortened nonlinearly with TBHP addition at initial temperatures of 650 K to 1000 K, namely, the reduction rate of ignition delay times rises slowly as the TBHP addition ratio increases. In addition, the negative temperature coefficient (NTC) behavior can be weakened significantly with TBHP addition at 650 K to 1000 K. Especially, the ignition delay time of n‐butane can be reduced about 32 times with 10% TBHP addition at 750 K. However, the ignition intensification effect of TBHP addition is slight when the initial temperature is above 1000 K. The acting mechanism of TBHP addition was investigated in detail by the rate of production and consumption (ROP), sensitivity, and reaction pathway analysis. The ROP analysis shows that the released and quickly consumed OH radicals with TBHP addition play an important role in promoting n‐butane ignition at the lower initial temperature. However, the relatively slow consumption rate of OH radicals at higher temperature weakens the intensification effect. Furthermore, the sensitivity analysis and reaction pathway analysis indicate that the dominated elemental reactions and reaction pathway vary significantly with TBHP addition at lower initial temperature.

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Effect of free-radical release on diesel ignition delay under simulated cold-starting conditions

Cited by 50 publications

References 8 publications

Simultaneous optimization of smoke and NO_x emissions in a stationary diesel engine fuelled with diesel–oxygenate blends using the grey relational analysis in the Taguchi method

Simultaneous optimization of smoke and NO_x emissions in a stationary diesel engine fuelled with diesel–oxygenate blends using the grey relational analysis in the Taguchi method

Improved Kinetic Mechanism for Diethyl Ether Oxidation with a Reduced Model

Numerical investigation on ignition intensification of n‐butane with tert‐butyl hydroperoxide (TBHP) addition

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Effect of free-radical release on diesel ignition delay under simulated cold-starting conditions

Cited by 50 publications

References 8 publications

Simultaneous optimization of smoke and NOx emissions in a stationary diesel engine fuelled with diesel–oxygenate blends using the grey relational analysis in the Taguchi method

Simultaneous optimization of smoke and NOx emissions in a stationary diesel engine fuelled with diesel–oxygenate blends using the grey relational analysis in the Taguchi method

Improved Kinetic Mechanism for Diethyl Ether Oxidation with a Reduced Model

Numerical investigation on ignition intensification of n‐butane with tert‐butyl hydroperoxide (TBHP) addition

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Simultaneous optimization of smoke and NO_x emissions in a stationary diesel engine fuelled with diesel–oxygenate blends using the grey relational analysis in the Taguchi method

Simultaneous optimization of smoke and NO_x emissions in a stationary diesel engine fuelled with diesel–oxygenate blends using the grey relational analysis in the Taguchi method