Shock tube measurements and kinetic modeling study on autoignition characteristics of cyclohexanone

He, Jiasong; Gou, Yudan; Lu, Pengfei; Zhang, Changhua; Li, Ping; Li, Xiangyuan

doi:10.1016/j.combustflame.2018.02.002

Cited by 15 publications

(10 citation statements)

References 40 publications

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“…The overall uncertainty in present experiments was ±20%, mainly generated by the uncertainty in the ignition temperature. The experimental method descripted detailedly can be found in our previous publications [9][10][11][12] .…”

Section: Experimental Methodsmentioning

confidence: 99%

A Comparative Study of Ignition Delay of Cracked Kerosene/Air and Kerosene/Air over a Wide Temperature Range

WANG¹,

ZHANG²,

WAN³

et al. 2019

Acta Physico-Chimica Sinica

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Kerosene is an ideal endothermic hydrocarbon. Its pyrolysis plays a significant role in the thermal protection for high-speed aircraft. Before it reacts, kerosene experiences thermal decomposition in the heat exchanger and produces cracked products. Thus, to use cracked kerosene instead of pure kerosene, knowledge of their ignition properties is needed. In this study, ignition delay times of cracked kerosene/air and kerosene/air were measured in a heated shock tube at temperatures of 657-1333 K, an equivalence ratio of 1.0, and pressures of 1.01 × 10 5 -10.10 × 10 5 Pa. Ignition delay time was defined as the time interval between the arrival of the reflected shock and the occurrence of the steepest rise of excited-state CH species (CH*) emission at the sidewall measurement location. Pure helium was used as the driver gas for high-temperature measurements in which test times needed to be shorter than 1.5 ms, and tailored mixtures of He/Ar were used when test times could reach up to 15 ms. Arrhenius-type formulas for the relationship between ignition delay time and ignition conditions (temperature and pressure) were obtained by correlating the measured high-temperature data of both fuels. The results reveal that the ignition delay times of both fuels are close, and an increase in the pressure or temperature causes a decrease in the ignition delay time in the high-temperature region (> 1000 K). Both fuels exhibit similar high-temperature ignition delay properties, because they have close pressure exponents (cracked kerosene: τign∝P −0.85 ; kerosene: τign∝P −0.83 ) and global activation energies (cracked kerosene: Ea = 143.37 kJmol −1 ; kerosene: Ea = 144.29 kJmol −1 ). However, in the low-temperature region (< 1000 K), ignition delay characteristics are quite different. For cracked kerosene/air, while the decrease in the temperature still results in an increase in the ignition delay time, the negative temperature coefficient (NTC) of ignition delay does not occur, and the low-temperature ignition data still can be correlated by an Arrhenius-type formula with a much smaller global activation energy compared to that at high temperatures. However, for kerosene/air, this NTC phenomenon was observed, and the Arrhenius-type formula fails to correlate its low-temperature ignition data. At temperatures ranging from 830 to 1000 K, the cracked kerosene ignites faster than the kerosene; at temperatures below 830 K, kerosene ignition delay times become much shorter than those of cracked kerosene. Surrogates for cracked kerosene and kerosene are proposed based on the H/C ratio and average molecular weight in order to simulate ignition delay times for cracked kerosene/air and kerosene/air. The simulation results are in fairly good agreement with current experimental data for the two fuels at high temperatures (> 1000 K). However, in the low-temperature NTC region, the results are in very good agreement with kerosene ignition delay data but disagree with cracked kerosene ignition delay data. The comparison between experimental d...

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Section: Experimental Methodsmentioning

confidence: 99%

A Comparative Study of Ignition Delay of Cracked Kerosene/Air and Kerosene/Air over a Wide Temperature Range

WANG¹,

ZHANG²,

WAN³

et al. 2019

Acta Physico-Chimica Sinica

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“…Contrary to the CPO oxidation model, the modified kinetic model from He et al 26 predicted the H-abstraction reaction at the -site of CHO to be the dominant channel. Thion et al 28 recently also proposed an improved kinetic model for CHO oxidation by validating against their new JSR measurements to complement their earlier work.…”

Section: Introductionmentioning

confidence: 97%

“…Despite their importance in combustion, only few studies have been dedicated to understand the combustion behavior of cyclic ketones. [15][16][19][20][21][22][23][24][25][26] Giri et al 23 recently reported experimental and theoretical rate coefficients for the thermal unimolecular decomposition of cyclopentanone (CPO). Their master equation results were consistent with the experimental results, indicating that CPO almost exclusively (> 95%) decomposes to produce CO and C2H4.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, there is a need to provide accurate rate coefficients for the hydrogen abstraction reaction to build a robust combustion model. As for cyclohexanone (CHO), a recent paper by He et al 26 provides a brief literature review. Serinyel et al 25 studied the kinetics of CHO oxidation in a jet stirred reactor (JSR) over a wide range of experimental conditions (T = 530 -1220 K, p = 10 atm and  = 0.5 -4).…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, the authors demanded for more experimental data to fully validate the proposed mechanism. Aiming for a better combustion model of cyclohexanone, He et al 26 measured ignition delay times of cyclohexanone behind reflected shock waves over p = 2.5 -10 atm, T = 1255 -1646 K and  = 0.5 -2.0. The authors compared their measured values with the predictions from earlier kinetic model 25 and found that the model over-predicted their measurements by 30 -50%.…”

Section: Introductionmentioning

confidence: 99%

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Cyclic Ketones as Future Fuels: Reactivity with OH Radicals

2019

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For a sustainable energy future, research directions should orient towards exploring new fuels suitable for future advanced combustion engines to achieve better engine efficiency and significantly less harmful emissions. Cyclic ketones, among bio-derived fuels, are of significant interest to the combustion community for several reasons. As they possess high resistance to auto-ignition characteristics, they can potentially be attractive for fuel blending applications to increase engine efficiency and also to mitigate harmful emissions. Despite their importance, very few studies are rendered in understanding of the chemical kinetic behavior of cyclic ketones under engine-relevant conditions. In this work, we have conducted an experimental investigation for the reaction kinetics of OH radicals with cyclopentanone (CPO) and cyclohexaneone (CHO) for the first time over a wide range of experimental conditions (T = 900 -1330 K, and p ~ 1.2 bar) in a shock tube. Reaction kinetics was followed by monitoring UV laser absorption of OH radicals near 306.7 nm. Our measured rate coefficients, with an overall uncertainty (2) of  20%, can be expressed in Arrhenius form as (in units of cm 3 molecule -1 s -1 ):

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Experimental and kinetic study of diesel/gasoline surrogate blends over wide temperature and pressure

Wang

Feng

Mao

et al. 2020

Combustion and Flame

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Shock tube measurements and kinetic modeling study on autoignition characteristics of cyclohexanone

Cited by 15 publications

References 40 publications

A Comparative Study of Ignition Delay of Cracked Kerosene/Air and Kerosene/Air over a Wide Temperature Range

A Comparative Study of Ignition Delay of Cracked Kerosene/Air and Kerosene/Air over a Wide Temperature Range

Cyclic Ketones as Future Fuels: Reactivity with OH Radicals

Experimental and kinetic study of diesel/gasoline surrogate blends over wide temperature and pressure

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