A rapid compression facility study of OH time histories during iso-octane ignition

He, Xin; Zigler, Bradley T.; Walton, S.M.; Wooldridge, Margaret S.; Atreya, Arvind

doi:10.1016/j.combustflame.2005.12.014

Cited by 65 publications

(38 citation statements)

References 31 publications

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“…were not included in the study. In a follow-up study, OH radicals were quantified during iso-octane oxidation in the facility at 945 -1020 K temperatures, 8.5 -15 atm pressures, and 0.25 -0.35 equivalence ratios [71]. OH concentration is a key feature in HCCI conditions because it is the main radical that consumes the fuel and is an indication of the reactivity of the mixture.…”

Section: Previous Experimental Workmentioning

confidence: 99%

Development of an Experimental Database and Chemical Kinetic Models for Surrogate Gasoline Fuels

Pitz

Cernansky

Dryer

et al. 2007

SAE Technical Paper Series

321

243

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The development of surrogate mixtures that represent gasoline combustion behavior is reviewed.1 Combustion chemistry behavioral targets that a surrogate should accurately reproduce, particularly for emulating homogeneous charge compression ignition (HCCI) operation, are carefully identified. Both short and long term research needs to support development of more robust surrogate fuel compositions are described. Candidate component species are identified and the status of present chemical kinetic models for these components and their interactions are discussed. Recommendations are made for the initial components to be included in gasoline surrogates for near term development. Components that can be added to refine predictions and to include additional behavioral targets are identified as well. Thermodynamic, thermochemical and transport properties that require further investigation are discussed.

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Section: Previous Experimental Workmentioning

confidence: 99%

Development of an Experimental Database and Chemical Kinetic Models for Surrogate Gasoline Fuels

Pitz

Cernansky

Dryer

et al. 2007

SAE Technical Paper Series

321

243

View full text Add to dashboard Cite

show abstract

“…Quantitative measurements of the evolution of radical and hydrocarbon (HC) concentrations provide explicit knowledge of the species formed during radical pool growth and fuel oxidation. For example, experimental investigations of the hydroxyl radical (OH) have elucidated the key role of hydrogen/oxygen kinetics at low [15] and high [21,22] temperatures during isooctane ignition. The study of intermediate HC species is of particular importance for understanding the reaction paths controlling fuel consumption; however, quantifying HC intermediates experimentally is often difficult because of the sampling and analytical methods typically required.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the intermediates of isooctane during ignition

Walton

Zigler

et al. 2007

Int J of Chemical Kinetics

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Direct measurements of intermediates of ignition are challenging experimental objectives, yet such measurements are critical for understanding fuel decomposition and oxidation pathways. In the current work, a new gas-sampling system is used to provide quantitative discrete measurements of 30 hydrocarbon and oxygenate species during rapid compression facility studies of isooctane ignition. Two target conditions and equivalence ratios (based on molar fuel to oxygen ratio) were studied (P = 5.2 atm, T = 1000 K, φ = 0.4 and P = 4.8 atm, T = 975 K , φ = 1.2). The results are compared with model predictions that use the detailed reaction mechanism developed by Curran et al. (Combust Flame 2002, 129, 253-280). In general, the model predictions are in excellent agreement with the experimental data, including several trace species. Isobutene (i-C 4 H 8 ) and propene (C 3 H 6 ) were the major olefin species identified in the experiments. The results are consistent with an intermediate temperature reaction path sequence, where isooctane is consumed by H-atom abstraction to yield isooctyl radicals that undergo β-scission to form olefin and alkyl radical species.

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“…Other laser diagnostics used in RCM studies include measurements of soot volume concentration [85] and hydroxyl radical concentration [86,87]. In [85], the soot evolution was studied by the line-of-sight extinction method, which measured the soot concentration in the initial stage of soot growth before the optical path became opaque.…”

Section: Diagnostics In Rcm Experimentsmentioning

confidence: 99%

“…Using OH laser absorption, the ignition and combustion kinetics of silane were investigated [86]. Furthermore, He et al [87] measured OH concentrations using narrow line absorption centered at 3206.556 cm -1 during isooctane autoignition. The spectral line was chosen to minimize absorption from olefins and soot produced during the induction and ignition events, respectively.…”

Section: Diagnostics In Rcm Experimentsmentioning

confidence: 99%

“…The spectral line was chosen to minimize absorption from olefins and soot produced during the induction and ignition events, respectively. He et al [87] estimated that the uncertainty associated with the OH measurements was approximately ±12%. The measured OH profiles were further used to validate the rate constants of important reactions [87].…”

Section: Diagnostics In Rcm Experimentsmentioning

confidence: 99%

See 1 more Smart Citation

Using rapid compression machines for chemical kinetics studies

Sung¹,

Curran²

2014

Progress in Energy and Combustion Science

266

127

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Rapid compression machines (RCMs) are used to simulate a single compression stroke of an internal combustion engine without some of the complicated swirl bowl geometry, cycle-to-cycle variation, residual gas, and other complications associated with engine operating conditions. RCMs are primarily used to measure ignition delay times as a function of temperature, pressure, and fuel/oxygen/diluent ratio; further they can be equipped with diagnostics to determine the temperature and flow fields inside the reaction chamber and to measure the concentrations of reactant, intermediate, and product species produced during combustion. This paper first discusses the operational principles and design features of RCMs, including the use of creviced pistons, which is an important feature in order to suppress the boundary layer, preventing it from becoming entrained into the reaction chamber via a roll-up vortex. The paper then discusses methods by which experiments performed in RCMs are interpreted and simulated. Furthermore, differences in measured ignition delays from RCMs and shock tube facilities are discussed, with the apparent initial gross disagreement being explained by facility effects in both types of experiments. Finally, future directions for using RCMs in chemical kinetics studies are also discussed.

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A rapid compression facility study of OH time histories during iso-octane ignition

Cited by 65 publications

References 31 publications

Development of an Experimental Database and Chemical Kinetic Models for Surrogate Gasoline Fuels

Development of an Experimental Database and Chemical Kinetic Models for Surrogate Gasoline Fuels

Experimental investigation of the intermediates of isooctane during ignition

Using rapid compression machines for chemical kinetics studies

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