Chemical Kinetics of Hydrocarbon Ignition in Practical Combustion Systems

Westbrook, C K

doi:10.1016/S0082-0784(00)80554-8

Chemical Kinetics of Hydrocarbon Ignition in Practical Combustion Systems

Conference · Fri Jul 07 04:00:00 EDT 2000

DOI:https://doi.org/10.1016/S0082-0784(00)80554-8· OSTI ID:791580

Westbrook, C K ^[1]

LLNL

Chemical kinetic factors of hydrocarbon oxidation are examined in a variety of ignition problems. Ignition is related to the presence of a dominant chain branching reaction mechanism that can drive a chemical system to completion in a very short period of time. Ignition in laboratory environments is studied for problems including shock tubes and rapid compression machines. Modeling of the laboratory systems are used to develop kinetic models that can be used to analyze ignition in practical systems. Two major chain branching regimes are identified, one consisting of high temperature ignition with a chain branching reaction mechanism based on the reaction between atomic hydrogen with molecular oxygen, and the second based on an intermediate temperature thermal decomposition of hydrogen peroxide. Kinetic models are then used to describe ignition in practical combustion environments, including detonations and pulse combustors for high temperature ignition, and engine knock and diesel ignition for intermediate temperature ignition. The final example of ignition in a practical environment is homogeneous charge, compression ignition (HCCI) which is shown to be a problem dominated by the kinetics intermediate temperature hydrocarbon ignition. Model results show why high hydrocarbon and CO emissions are inevitable in HCCI combustion. The conclusion of this study is that the kinetics of hydrocarbon ignition are actually quite simple, since only one or two elementary reactions are dominant. However, there are many combustion factors that can influence these two major reactions, and these are the features that vary from one practical system to another.

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Research Organization:: Lawrence Livermore National Lab., Livermore, CA (US)

Sponsoring Organization:: USDOE Office of Defense Programs (DP) (US)

DOE Contract Number:: W-7405-ENG-48

OSTI ID:: 791580

Report Number(s):: UCRL-JC-138169

Country of Publication:: United States

Language:: English

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Chemical Kinetics of Hydrocarbon Ignition in Practical Combustion Systems

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