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Chemical kinetics and engine knock

Author
Westbrook, C. K.
Published
United States : [publisher not identified], 1986
Springfield, Va.: National Technical Information Service, [approximately 1986]
Physical Description
microfiche : negative ; 11 x 15 cm

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Summary
Engine knock in internal combustion engines provides an important limit to the improvements in combustion efficiency which could otherwise be achieved by increasing the compression ratio. Knock is generally believed to be the result of the spontaneous thermal ignition of a quantity of fuel-air mixture in the combustion chamber before it can be consumed by a ''normal'' flame propagating through the chamber. Strategies intended to ameliorate the knock problem must be based on a thorough understanding of the thermokinetic process of autoignition of hydrocarbon fuel-air mixtures under conditions which occur in automobile engines. In this paper, kinetic modeling of this autoignition process will be described, beginning with ''low temperature'' oxidation (500 to 800/sup 0/K), cool flames, and the negative temperature coefficient, followed by kinetics in the intermediate temperature range (T = 1000K), extending finally to high temperature oxidation kinetics. The fuels used as examples will include the common ones such as methane and propane, but other examples for more complex, realistic fuels such as n-octane and iso-octane will also be used in order to illustrate the modeling of the importance of fuel molecular structure on the kinetics of autoignition. Use of this kinetic model to explain the mode of operation of antiknock additives such as tetra-ethyl lead will also be outlined.
Report Numbers
DE86014775; UCRL-95037; CONF-860764-1
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: W-7405-ENG-48
OSTI Identifier 5402383
Research organization: Lawrence Livermore National Lab., CA (USA).
View MARC record | catkey: 47368273