Affiliation:
1. Department of Mechanical Engineering and Manufacturing Systems, Coventry Polytechnic
Abstract
Recent studies have shown that a ‘barrel’ swirl type of flow in spark ignition engines may be exploited to provide improved fuel economy and reduced emissions. A simple analytical phenomenological model of ‘barrel’ swirl has been developed for a disc-type combustion chamber that describes the vortex behaviour during compression. The model shows that the vortex can spin up during early compression but then rapidly decays as top dead centre is approached due to the high fluid shear stresses that develop. This mechanism of swirl arrestment is shown to dominate that due to wall friction. The model confirms experimental findings that show rapid swirl decay in certain four-valve engines.
Subject
Mechanical Engineering,Aerospace Engineering
Reference2 articles.
1. Benjamin S. F. The development of the GTL ‘barrel swirl’ combustion system with application to four-valve spark ignition engines. IMechE conference on Combustion-engines-technology and applications, 1988, paper C323/049, p. 203 (Mechanical Engineering Publications, London).
2. Predictions of In-Cylinder Swirl Velocity and Turbulence Intensity for an Open Chamber Cup in Piston Engine
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