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Subject = autoignition;
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Displaying Results 1 - 14 of 14 on page 1 of 1
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A comprehensive experimental and kinetic modeling study of 1-and 2-pentene
(2021)
Dong, Shijun; Zhang, Kuiwen; Ninnemann, Erik M.; Najjar, Ahmed; Kukkadapu, Goutham; Bak...
A comprehensive experimental and kinetic modeling study of 1-and 2-pentene
(2021)
Dong, Shijun; Zhang, Kuiwen; Ninnemann, Erik M.; Najjar, Ahmed; Kukkadapu, Goutham; Baker, Jessica; Arafin, Farhan; Wang, Zhandong; Pitz, William J.; Vasu, Subith S.; Sarathy, S. Mani; Senecal, Peter K.; Curran, Henry J.
Abstract:
1- and 2-pentene are components in gasoline and are also used as representative alkene components in gasoline surrogate fuels. Most of the available ignition delay time data in the literature for these fuels are limited to low pressures, high temperatures and highly diluted conditions, which limits the kinetic model development and validation potential of these fuels. Therefore, ignition delay time measurements under engine-like conditions are needed to provide target data to understand their low-temperature fuel chemistry and extend their chemical kinetic validation to lower temperatures and higher pressures. In this study, both a high-pressure shock tube and a rapid compression machine have been employed to measure ignition delay times of 1- and 2-pentene over a wide temperature range (60 0-130 0 K) at equivalence ratios of 0.5, 1.0 and 2.0 in 'air', and at pressures of 15 and 30 atm. At high-temperatures (> 900 K), the experimental ignition delay times show that the ...
http://hdl.handle.net/10379/16444
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A detailed chemical kinetic modeling and experimental investigation of the low- and high-temperature chemistry of n-butylcyclohexane
(2021)
Pitz, William J.; Liang, Jinhu; Kukkadapu, Goutham; Zhang, Kuiwen; Conroy, Christine; B...
A detailed chemical kinetic modeling and experimental investigation of the low- and high-temperature chemistry of n-butylcyclohexane
(2021)
Pitz, William J.; Liang, Jinhu; Kukkadapu, Goutham; Zhang, Kuiwen; Conroy, Christine; Bugler, John; Curran, Henry J.
Abstract:
Chemical kinetic models of gasoline, jet, and diesel fuels and their mixtures with bioderived fuels are needed to assess fuel property effects on efficiency, emissions, and other performance metrics in internal combustion and gas turbine engines. As these real fuels have too many fuel components to be included in a chemical kinetic model, surrogate fuels containing fewer components are used to represent them. These surrogate fuels mimic the chemical classes or molecular structures contained in the real fuel. One of the important chemical classes in gasoline, jet, and diesel fuels comprises cyclohexanes. Cyclohexanes comprise about 30% or more by weight in diesel fuel. Also, Mueller et al (Energy Fuels. 2012;26(6):3284-3303) proposed n-butylcyclohexane (nBCH) as a component in a nine-component surrogate palette to represent the ignition properties, distillation curve, density, and molecular structures of a diesel certification fuel. In this work, experimental measurements of the igni...
http://hdl.handle.net/10379/16440
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An experimental and kinetic modeling study of the oxidation of hexane isomers: Developing consistent reaction rate rules for alkanes
(2019)
Kuiwen, Zhang; Banyon, Colin; Burke, Ultan; Kukkadapu, Goutham; Wagnon, Scott W.; Mehl,...
An experimental and kinetic modeling study of the oxidation of hexane isomers: Developing consistent reaction rate rules for alkanes
(2019)
Kuiwen, Zhang; Banyon, Colin; Burke, Ultan; Kukkadapu, Goutham; Wagnon, Scott W.; Mehl, Marco; Curran, Henry J.; Westbrook, Charles K.; Pitz, William J.
Abstract:
Alkanes are key components in gasoline, jet and diesel fuels and considerably influence the combustion behavior of these fuels because of their wide range of reactivity. An improved understanding of their combustion behavior and the development of chemical kinetic models that can accurately simulate their combustion behavior are important for the development of next-generation internal-combustion and gas-turbine engines. The current work provides improved insight into oxidation mechanisms of a representative family of hydrocarbon fuels, specifically the hexane isomers: n-hexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane and 2,3-dimethylbutane. These isomers provide carbon "skeletons" ranging from straight-chained to highly-branched and provide a framework for the subsequent development of kinetic mechanisms for larger alkanes. New ignition delay times for the four branched hexane isomers were measured in a high-pressure shock tube and in a rapid compression mach...
http://hdl.handle.net/10379/15429
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An experimental and modeling study of the ignition of dimethyl carbonate in shock tubes and rapid compression machine
(2019)
Alexandrino, Katiuska; Alzueta, María U.; Curran, Henry J.
An experimental and modeling study of the ignition of dimethyl carbonate in shock tubes and rapid compression machine
(2019)
Alexandrino, Katiuska; Alzueta, María U.; Curran, Henry J.
Abstract:
Ignition delay times of dimethyl carbonate DMC were measured using low- and high-pressure shock tubes and in a rapid compression machine (RCM). In this way, the effect of fuel concentration (0.75% and 1.75%), pressure (2.0, 20, and 40 atm) and equivalence ratio (0.5, 1.0, 2.0) on ignition delay times was studied experimentally and computationally using a chemical kinetic model. Experiments cover the temperature range of 795-1585 K. Several models from the literature were used to perform simulations, thus their performances to predict the present experimental data was examined. Furthermore, the effect of the thermodynamic data of the CH3O(C=O) (O) over dot radical species and the fuel consumption reaction CH3O(C=O)OCH3 reversible arrow CH3O(C=O)(O) over dot+(C) over dotH(3), on the simulations of the ignition delay times of DMC was analyzed using the different models. Reaction path and sensitivity analyses were carried out with a final recommended model to present an in-depth analysi...
http://hdl.handle.net/10379/14783
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An ignition delay time and chemical kinetic modeling study of the pentane isomers
(2016)
Bugler, John; Heufer, Karl A.; Curran, Henry J.
An ignition delay time and chemical kinetic modeling study of the pentane isomers
(2016)
Bugler, John; Heufer, Karl A.; Curran, Henry J.
Abstract:
Ignition delay times of n-pentane, iso-pentane, and neo-pentane mixtures were measured in two shock tubes and in a rapid compression machine. The experimental data were used as validation targets for the model described in detail in an accompanying study [14]. The present study presents ignition delay time data for the pentane isomers at equivalence ratios of 0.5, 1.0, and 2.0 in 'air' (additionally, 0.3 in 'air' for n-, and isopentane) at pressures of 1, 10, and 20 atm in the shock tube, and 10 and 20 atm in the rapid compression machine, as well as data at an equivalence ratio of 1.0 in 99% argon, at pressures near 1 and 10 atm in a shock tube. An infrared laser absorption technique at 3.39 mu m was used to verify the composition of the richest mixtures in the shock-tube tests by measuring directly the pentane isomer concentration in the driven section. By using shock tubes and a rapid compression machine, it was possible to investigate temperatures ranging fro...
http://hdl.handle.net/10379/5640
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An ignition delay time and chemical kinetic modeling study of the pentane isomers
(2018)
Bugler, John; Marks, Brandon; Mathieu, Olivier; Archuleta, Rachel; Camou, Alejandro; Gr...
An ignition delay time and chemical kinetic modeling study of the pentane isomers
(2018)
Bugler, John; Marks, Brandon; Mathieu, Olivier; Archuleta, Rachel; Camou, Alejandro; Grégoire, Claire; Heufer, Karl A.; Petersen, Eric L.; Curran, Henry J.
http://hdl.handle.net/10379/10589
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An RCM experimental and modeling study on CH4 and CH4/C2H6 oxidation at pressures up to 160 bar
(2017)
Ramalingam, Ajoy; Zhang, Kuiwen; Dhongde, Avnish; Virnich, Lukas; Sankhla, Harsh; Curra...
An RCM experimental and modeling study on CH4 and CH4/C2H6 oxidation at pressures up to 160 bar
(2017)
Ramalingam, Ajoy; Zhang, Kuiwen; Dhongde, Avnish; Virnich, Lukas; Sankhla, Harsh; Curran, Henry J.; Heufer, Alexander
Abstract:
The oxidation of CH4 and CH4/C2H6 mixtures were studied at pressures relevant to knocking in large bore natural gas engines. The experiments were carried out in a rapid compression machine (RCM) at end of compression (EOC) temperatures ranging between 885 and 940 K at compressed gas pressures of 105, 125, 150, and 160 bar at varying equivalence ratios (0.417, 0.526, and 1.0) and dilution percentages (0, 10, and 30% Exhaust Gas Recirculation - EGR) that were defined in a test matrix. This study describes the method and limitations of performing high-pressure experiments of this magnitude in an RCM, modeling, and validation of the kinetic mechanism against experimental data. While the recently published AramcoMech 2.0 could well predict the ignition delay times (IDTs) for CH4 within the uncertainty ranges at comparatively higher pressures and lower temperatures (885-940 K), the predicted reactivity is, in general, lower than that of AramcoMech 1.3 as shown in our previous screening st...
http://hdl.handle.net/10379/6899
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Autoignition of ethanol in a rapid compression machine
(2016)
Mittal, Gaurav; Burke, Sinéad M.; Davies, Varun A.; Parajuli, Bikash; Metcalfe, Wayne K...
Autoignition of ethanol in a rapid compression machine
(2016)
Mittal, Gaurav; Burke, Sinéad M.; Davies, Varun A.; Parajuli, Bikash; Metcalfe, Wayne K.; Curran, Henry J.
Abstract:
Ethanol is a renewable source of energy and significant attention has been directed to the development of a validated chemical kinetic mechanism for this fuel. The experimental data for the autoignition of ethanol in the low temperature range at elevated pressures are meager. In order to provide experimental data sets for mechanism validation at such conditions, the autoignition of homogeneous ethanol/oxidizer mixtures has been investigated in a rapid compression machine. Experiments cover a range of pressures (10-50 bar), temperatures (825-985 K) and equivalence ratios of 0.3-1.0. Ignition delay data are deduced from the experimental pressure traces. Under current experimental conditions of elevated pressures and low temperatures, chemistry pertaining to hydroperoxyl radicals assumes importance. A chemical kinetic mechanism that can accurately predict the autoignition characteristics of ethanol at low temperatures and elevated pressures has been developed and this mechanism is comp...
http://hdl.handle.net/10379/6112
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Cyclopentane combustion. Part II. Ignition delay measurements and mechanism validation
(2017)
Al Rashidi, Mariam J.; Mármol, Juan C.; Banyon, Colin; Sajid, Muhammad B.; Mehl, Marco;...
Cyclopentane combustion. Part II. Ignition delay measurements and mechanism validation
(2017)
Al Rashidi, Mariam J.; Mármol, Juan C.; Banyon, Colin; Sajid, Muhammad B.; Mehl, Marco; Pitz, William J.; Mohamed, Samah; Alfazazi, Adamu; Lu, Tianfeng; Curran, Henry J.; Farooq, Aamir; Sarathy, S. Mani
Abstract:
This study reports cyclopentane ignition delay measurements over a wide range of conditions. The measurements were obtained using two shock tubes and a rapid compression machine, and were used to test a detailed low- and high-temperature mechanism of cyclopentane oxidation that was presented in part I of this study (Al Rashidi et al., 2017). The ignition delay times of cyclopentane/air mixtures were measured over the temperature range of 650-1350 K at pressures of 20 and 40 atm and equivalence ratios of 0.5, 1.0 and 2.0. The ignition delay times simulated using the detailed chemical kinetic model of cyclopentane oxidation show very good agreement with the experimental measurements, as well as with the cyclopentane ignition and flame speed data available in the literature. The agreement is significantly improved compared to previous models developed and investigated at higher temperatures. Reaction path and sensitivity analyses were performed to provide insights into the ignition-con...
http://hdl.handle.net/10379/6870
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Detailed chemical kinetic reaction mechanisms for primary reference fuels for diesel cetane number and spark-ignition octane number
(2018)
Westbrook, C.K.; Pitz, W.J.; Mehl, M.; Curran, Henry J.
Detailed chemical kinetic reaction mechanisms for primary reference fuels for diesel cetane number and spark-ignition octane number
(2018)
Westbrook, C.K.; Pitz, W.J.; Mehl, M.; Curran, Henry J.
http://hdl.handle.net/10379/14411
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Detailed chemical kinetic reaction mechanisms for soy and rapeseed biodiesel fuels
(2018)
Westbrook, C.K.; Naik, C.V.; Herbinet, O.; Pitz, W.J.; Mehl, M.; Sarathy, S.M.; Curran,...
Detailed chemical kinetic reaction mechanisms for soy and rapeseed biodiesel fuels
(2018)
Westbrook, C.K.; Naik, C.V.; Herbinet, O.; Pitz, W.J.; Mehl, M.; Sarathy, S.M.; Curran, Henry J.
http://hdl.handle.net/10379/14409
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Evaluation of non-ideal piston stopping effects on the “adiabatic core” and ignition delay time simulation in rapid compression machines
(2021)
Wu, Yingtao; Tang, Chenglong; Yang, Meng; Wang, Quan-de; Huang, Zuohua; Zhao, Peng; Cur...
Evaluation of non-ideal piston stopping effects on the “adiabatic core” and ignition delay time simulation in rapid compression machines
(2021)
Wu, Yingtao; Tang, Chenglong; Yang, Meng; Wang, Quan-de; Huang, Zuohua; Zhao, Peng; Curran, Henry J.
Abstract:
Piston creep and rebound are two non-ideal piston stopping behaviors in the rapid compression machine. Compared to nominal piston stopping, piston rebound/creep will result in a smaller/bigger 'adiabatic' core zone volume in the reaction chamber and length/shorten the ignition delay time measurements. However, the 'adiabatic core' hypothesis can still be validated under these compressions and ensures the applicability of zero-dimensional method in the model simulation. (C) 2020 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
This work is supported by the National Natural Science Foundation of China (51722603, and 91541107), CT is a TANG scholar and he appreciates the support from the Foundation of the National Defense Key Laboratory of Science and Technology on Combustion and Explosives. The work at NUI Galway was supported by Science Foundation Ireland (SFI) via grant awards 15/IA/3177 and 16/SP/3829. Yingtao Wu would like to thank ...
http://hdl.handle.net/10379/16445
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Probing the antagonistic effect of toluene as a component in surrogate fuel models at low temperatures and high pressures. A case study of toluene/dimethyl ether mixtures
(2017)
Zhang, Yingjia; Somers, Kieran P.; Mehl, Marco; Pitz, William J.; Cracknell, Roger F.; ...
Probing the antagonistic effect of toluene as a component in surrogate fuel models at low temperatures and high pressures. A case study of toluene/dimethyl ether mixtures
(2017)
Zhang, Yingjia; Somers, Kieran P.; Mehl, Marco; Pitz, William J.; Cracknell, Roger F.; Curran, Henry J.
Abstract:
There is a dearth of experimental data which examine the fundamental low-temperature ignition (T < 900 K) behavior of toluene resulting in a lack of data for the construction, validation, and interpretation of chemical kinetic models for commercial fuels. In order to gain a better understanding of its combustion chemistry, dimethyl ether (DME) has been used as a radical initiator to induce ignition in this highly knock resistant aromatic, and its influence on the combustion of toluene ignition was studied in both shock tube and rapid compression machines as a function of temperature (624–1459 K), pressure (20–40 atm), equivalence ratio (0.5–2.0), and blending ratio (100% toluene, 76% toluene (76T/24D), 58% toluene (58T/42D), 26% toluene (26T/74D) and 100% DME). Several literature chemical kinetic models are used to interpret our experimental results. For mixtures containing high concentrations of toluene at low-temperatures none of these are capable of reproducing experiment. Th...
http://hdl.handle.net/10379/6868
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Testing the validity of a mechanism describing the oxidation of binary n-heptane/toluene mixtures at engine operating conditions
(2019)
Malliotakis, Zisis; Banyon, Colin; Kuiwen, Zhang; Wagnon, Scott; Rodriguez Henriquez, J...
Testing the validity of a mechanism describing the oxidation of binary n-heptane/toluene mixtures at engine operating conditions
(2019)
Malliotakis, Zisis; Banyon, Colin; Kuiwen, Zhang; Wagnon, Scott; Rodriguez Henriquez, Jose Juan; Vourliotakis, George; Keramiotis, Christos; Founti, Maria; Mauss, Fabian; Pitz, William J.; Curran, Henry J.
Abstract:
The aim of this work is to evaluate the influence of the n-heptane/toluene ratio on the reactivity of binary toluene reference fuels (TRFs), through a combined experimental and numerical work. Novel experimental ignition delay time (IDT) data of three binary TRFs of varying n-heptane/toluene ratios have been obtained in a high-pressure shock tube and in a rapid compression machine at conditions relevant to novel engine operation. Measurements have been performed at two pressures (10 and 30 bar), and at three fuel/air equivalence ratios (0.5, 1.0 and 2.0) for TRF mixtures of 50%, 75% and 90% by volume toluene concentration, over the temperature range of 650-1450 K. It was found that, increasing the n-heptane content, led to an increase in reactivity and shorter measured IDTs. Reduced sensitivity to the equivalence ratio was observed at high temperatures, especially for high toluene content mixtures. A well validated detailed kinetic mechanism for TRF oxidation was utilized to provide...
http://hdl.handle.net/10379/14915
Displaying Results 1 - 14 of 14 on page 1 of 1
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