Fundamental features of hydrocarbon autoignition in a rapid compression machine
- The University, Leeds (United Kingdom). School of Chemistry
Results are reported for the autoignition characteristics of n-butane, n-pentane, n-hexane, and n-heptane and also of i-butane, i-octane, and toluene in stoichiometric mixtures with air following mechanical compression to gas temperatures in the range 600--950 K and pressures up to 0.9 MPa. Emphasis is placed on the dependence of ignition delay on compressed gas temperature, on the evolution of reaction as portrayed in the pressure-time records and on features of light output associated with single and two-stage ignition. Two-stage ignition is a clear feature of the n-alkane combustion at low compressed gas temperatures. Single-stage ignition is apparent at somewhat higher compressed gas temperatures, but there is evidence of the first stage reaction having occurred during the final stages of compression in some circumstances. Engine-knock related pressure waves are associated with the autoignition of the n-alkanes, to a lesser extent with the branched chain structures, but not at all with toluene under the present experimental conditions. These general features and also the relationship of the measured pressures to average gas temperatures attained during the ignition delay period are discussed. These data are relevant to the validation of numerical models for the autoignition of hydrocarbons.
- OSTI ID:
- 5524979
- Journal Information:
- Combustion and Flame; (United States), Journal Name: Combustion and Flame; (United States) Vol. 95:3; ISSN 0010-2180; ISSN CBFMAO
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
025000 -- Petroleum-- Combustion
2-METHYLPROPANE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ALKANES
ALKYLATED AROMATICS
AROMATICS
BUTANE
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
COMPRESSION
CONTROL
ENGINES
HEAT ENGINES
HEPTANE
HEXANE
HYDROCARBONS
IGNITION
INTERNAL COMBUSTION ENGINES
KINETICS
KNOCK CONTROL
MATHEMATICAL MODELS
OCTANE
ORGANIC COMPOUNDS
PENTANE
REACTION KINETICS
SPARK IGNITION ENGINES
TOLUENE