Browsing by Author "Hsiao, Ting-Pang"

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    Flame propagation model for the CFR engine under knocking and non-knocking conditions
    (2006) Hsiao, Ting-Pang; Swarts, André
    Engine knock is one of the factors that limit the design of spark-ignition (SI) engines. It is caused by the auto-ignition of the end-gas during combustion and can lead to severe engine damage and failure. Octane number indicates the ability of a fuel to resist auto-ignition in a SI engine and forms part of the gasoline fuel specification. Burn duration of normal combustion is an important parameter during fuel octane measurement and is often equated to the turbulent flame speed of the fuel. The objective of this project is to develop a combustion model using the turbulent flame propagation concept that can be used to study the influence of the underlying flame speed behaviour during combustion. The model was used to investigate the combustion in the CFR engine (the engine used to measure fuel octane number) since it was found previously that the pressure development, and by implication combustion, differs from that found in production engines.