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.
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ASME 2009 Internal Combustion Engine Division Fall Technical Conference
September 27–30, 2009
Lucerne, Switzerland
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
978-0-7918-4363-5
PROCEEDINGS PAPER
Simulation of Instantaneous Heat Transfer in Spark Ignition Internal Combustion Engines: Unsteady Thermal Boundary Layer Modelling Available to Purchase
David R. Buttsworth,
David R. Buttsworth
University of Southern Queensland, Toowoomba, QLD, Australia
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Abdalla Agrira,
Abdalla Agrira
University of Southern Queensland, Toowoomba, QLD, Australia
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Ray Malpress,
Ray Malpress
University of Southern Queensland, Toowoomba, QLD, Australia
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Talal Yusaf
Talal Yusaf
University of Southern Queensland, Toowoomba, QLD, Australia
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David R. Buttsworth
University of Southern Queensland, Toowoomba, QLD, Australia
Abdalla Agrira
University of Southern Queensland, Toowoomba, QLD, Australia
Ray Malpress
University of Southern Queensland, Toowoomba, QLD, Australia
Talal Yusaf
University of Southern Queensland, Toowoomba, QLD, Australia
Paper No:
ICEF2009-14056, pp. 413-419; 7 pages
Published Online:
July 8, 2010
Citation
Buttsworth, DR, Agrira, A, Malpress, R, & Yusaf, T. "Simulation of Instantaneous Heat Transfer in Spark Ignition Internal Combustion Engines: Unsteady Thermal Boundary Layer Modelling." Proceedings of the ASME 2009 Internal Combustion Engine Division Fall Technical Conference. ASME 2009 Internal Combustion Engine Division Fall Technical Conference. Lucerne, Switzerland. September 27–30, 2009. pp. 413-419. ASME. https://doi.org/10.1115/ICEF2009-14056
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