NDLI: Simulation of Instantaneous Heat Transfer in Spark Ignition Internal Combustion Engines: Unsteady Thermal Boundary Layer Modelling

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	David, R. Buttsworth Agrira, Abdalla Malpress, Ray Yusaf, Talal
Copyright Year	2009
Abstract	Simulation of internal combustion engine heat transfer using low-dimensional thermodynamic modelling often relies on quasi-steady heat transfer correlations. However, unsteady thermal boundary layer modelling could make a useful contribution because of the inherent unsteadiness of the internal combustion engine environment. Previous formulations of the unsteady energy equations for internal combustion engine thermal boundary layer modelling appear to imply that it is necessary to adopt the restrictive assumption that isentropic processes occur in the gas external to the thermal boundary layer. Such restrictions are not required and we have investigated if unsteady modelling can improve the simulation of crank-resolved heat transfer. A modest degree of success is reported for the present modelling which relies on a constant effective turbulent thermal conductivity. Improvement in the unsteady thermal boundary layer simulations is expected in future when the temporal and spatial variation in effective turbulent conductivity is correctly modelled.
Sponsorship	Internal Combustion Engine Division
Starting Page	413
Ending Page	419
Page Count	7
File Format	PDF
ISBN	9780791843635
DOI	10.1115/ICEF2009-14056
e-ISBN	9780791838587
Conference Proceedings	ASME 2009 Internal Combustion Engine Division Fall Technical Conference
Language	English
Publisher Date	2009-09-27
Publisher Place	Lucerne, Switzerland
Access Restriction	Subscribed
Subject Keyword	Thermal boundary layers Turbulence Simulation Internal combustion engines Ignition Thermal conductivity Modeling Heat transfer
Content Type	Text
Resource Type	Article

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