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Download fileA zero-dimensional combustion model with reduced kinetics for SI engine knock simulation
journal contribution
posted on 2011-04-20, 13:10 authored by Zhen Liu, Rui ChenHigh load performance and fuel economy of gasoline engines are limited by knocks. Such limitations
are becoming worse when the engine is heavily super-charged for high BMEP outputs. Spark ignition
timing retardation has been an efficient method to avoid the knock but results in reduced engine
performance and poor fuel economy. A better understanding of knock, which could be used to optimize
the engine design, ignition timing optimization in particular, is important. In this research, a simulation
model for SI engine knock has been developed. The model is based on a three-zone approach
(unburned, burning and burned zones). The Tanaka’s reduced chemical kinetic model for a commercial
gasoline fuel with an RON of 95 has been modified and applied in both burned and unburned zones
incorporated with the LUCKS (Loughborough University Chemical Kinetics Simulation) code. Both
post-flame heat release and pre-flame autoignition have be simulated. The burning zone uses equilibrium
combustion thermodynamic models. The simulated results have been validated against experimental
results, and good agreements have been achieved.
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School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Aeronautical and Automotive Engineering