The Reactivity Behavior of n-Heptane and Isooctane Blends in a Motored Knock Research Engine

Filipe, D.J.; Li, H.L.; Miller, David L.; Cernansky, Nicholas P.

doi:10.4271/920807

Cited by 9 publications

(3 citation statements)

References 32 publications

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“…Previous experimental studies of iso-octane oxidation have focused on shock tubes [5][6][7], jet-stirred reactors [8 -11], rapid compression machines [12][13][14][15][16], engines [17][18][19], flow reactors [20 -22] and [23], in which a dynamic behaviour is observed. All of these systems exhibit phenomena including self ignition, cool flame, and negative temperature coefficient (NTC) behavior.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive modeling study of iso-octane oxidation

Curran

2002

Combustion and Flame

1,237

722

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A detailed chemical kinetic mechanism has been developed and used to study the oxidation of iso-octane in a jet-stirred reactor, flow reactors, shock tubes and in a motored engine. Over the series of experiments investigated, the initial pressure ranged from 1 to 45 atm, the temperature from 550 K to 1700 K, the equivalence ratio from 0.3 to 1.5, with nitrogen-argon dilution from 70% to 99%. This range of physical conditions, together with the measurements of ignition delay time and concentrations, provide a broad-ranging test of the chemical kinetic mechanism. This mechanism was based on our previous modeling of alkane combustion and, in particular, on our study of the oxidation of n-heptane. Experimental results of ignition behind reflected shock waves were used to develop and validate the predictive capability of the reaction mechanism at both low and high temperatures. Moreover, species' concentrations from flow reactors and a jet-stirred reactor were used to help complement and refine the low and intermediate temperature portions of the reaction mechanism, leading to good predictions of intermediate products in most cases. In addition, a sensitivity analysis was performed for each of the combustion environments in an attempt to identify the most important reactions under the relevant conditions of study.

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Section: Introductionmentioning

confidence: 99%

A comprehensive modeling study of iso-octane oxidation

Curran

2002

Combustion and Flame

1,237

722

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“…There are much fewer data on τ (T , p) for the many different nonPRFs over practical ranges of T and p. They can be obtained from measurements of engine autoignitions and much trial and error, as in [4], by measurements in rapid-compression machines [19,20] and shock tubes [16,21], even up to 22 MPa [22], and by chemical kinetic modeling [23,24]. The chemical kinetics of the oxidation of n-heptane and isooctane, under engine conditions, has featured in [25][26][27]. These different approaches have been applied principally to PRFs.…”

Section: Derivation Of Non-prf Delay Times From Experimental Oimentioning

confidence: 99%

Engine autoignition: The relationship between octane numbers and autoignition delay times

Bradley

Head

2006

Combustion and Flame

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“…The formation of low-temperature oxidation species of the PRF mixture was also studied using a Cooperative Fuel Research (CFR) motored engine. Filipe et al 3 used a nondispersive infrared analyzer to measure the exhaust carbon monoxide (CO) formed in a motored engine. The other stable intermediates (carbon dioxide, C 4 -alkenes, formaldehyde, methanol, etc.)…”

Section: Introductionmentioning

confidence: 99%

Gasoline Surrogate Oxidation in a Motored Engine, a JSR, and an RCM: Characterization of Cool-Flame Products by High-Resolution Mass Spectrometry

et al. 2022

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The oxidation of a PRF 50 gasoline surrogate (n-heptane/iso-octane) performed earlier in a jet-stirred reactor (JSR) and a rapid compression machine (RCM), showed that oxidation proceeds similarly in both conditions. The present work extends that investigation by oxidizing a n-heptane / isooctane mixture under motored engine conditions. Exhaust gases were collected through bubbling in cooled acetonitrile. The samples were analyzed by ultra-high-pressure liquid chromatography (UHPLC) coupled to high-resolution mass spectrometry (HRMS-orbitrap Q-Exactive™). Low-temperature oxidation intermediates were characterized using tandem mass spectrometry (MS/MS), H/D exchange, and 2,4-dinitrophenyl hydrazine derivatization. In addition to cyclic ethers/ketones/aldehydes (C 7 H 14 O, C 8 H 16 O), ketohydroperoxides (C 7 H 14 O 3 , C 8 H 16 O 3 ), diketones (C 7 H 12 O 2 , C 8 H 14 O 2 ), and ketodihydroperoxides (C 7 H 14 O 5 , C 8 H 16 O 5 ), presented in our previous work, a large set of newly detected or rarely considered low-temperature products are presented here. They include hydroperoxides and diols (C 7 H 16 O 2 , C 8 H 18 O 2 ), olefinic hydroperoxides/diols (C 7 H 14 O 2 , C 8 H 16 O 2 ), dihydroperoxides (C 7 H 16 O 4 , C 8 H 18 O 4 ), olefinic dihydroperoxides (C 7 H 14 O 4 , C 8 H 16 O 4 ), olefinic cyclic ethers/carbonyls (C 7 H 12 O, C 8 H 14 O), di-and tri-olefinic cyclic ethers/ketones/aldehydes (C 7 H 10 O, C 7 H 8 O), olefinic ketohydroperoxides (C 7 H 12 O 3 , C 8 H 14 O 3 ), di-olefinic ketohydroperoxides (C 7 H 10 O 3 ), triketones (C 7 H 10 O 3 , C 8 H 12 O 3 ), olefinic diketones (C 7 H 10 O 2 , C 8 H 12 O 2 ), di-olefinic diketones (C 7 H 8 O 2 ), and diketohydroperoxides (C 7 H 12 O 4 , C 8 H 14 O 4 ). Motored engine's low-temperature oxidation intermediates were compared to those obtained in JSR and RCM. Despite the strong differences in the experimental conditions, the results indicate the formation of the same products. This indicates that a common chemical mechanism operates in motored engine, JSR, and RCM.

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The Reactivity Behavior of n-Heptane and Isooctane Blends in a Motored Knock Research Engine

Cited by 9 publications

References 32 publications

A comprehensive modeling study of iso-octane oxidation

A comprehensive modeling study of iso-octane oxidation

Engine autoignition: The relationship between octane numbers and autoignition delay times

Gasoline Surrogate Oxidation in a Motored Engine, a JSR, and an RCM: Characterization of Cool-Flame Products by High-Resolution Mass Spectrometry

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