Simulation of internal combustion engine heat transfer using low-dimensional thermodynamic modeling often relies on quasisteady heat transfer correlations. However, unsteady thermal boundary layer modeling 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 modeling 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 modeling can improve the simulation of crank-resolved heat transfer. A modest degree of success is reported for the present modeling, which relies on a constant effective turbulent thermal conductivity. Improvement in the unsteady thermal boundary layer simulations is expected in the future when the temporal and spatial variations in effective turbulent conductivity are correctly modeled.
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e-mail: david.buttsworth@usq.edu.au
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February 2011
Research Papers
Simulation of Instantaneous Heat Transfer in Spark Ignition Internal Combustion Engines: Unsteady Thermal Boundary Layer Modeling
David R. Buttsworth,
David R. Buttsworth
Faculty of Engineering and Surveying,
e-mail: david.buttsworth@usq.edu.au
University of Southern Queensland
, Toowoomba, Queensland 4350, Australia
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Abdalla Agrira,
Abdalla Agrira
Faculty of Engineering and Surveying,
University of Southern Queensland
, Toowoomba, Queensland 4350, Australia
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Ray Malpress,
Ray Malpress
Faculty of Engineering and Surveying,
University of Southern Queensland
, Toowoomba, Queensland 4350, Australia
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Talal Yusaf
Talal Yusaf
Faculty of Engineering and Surveying,
University of Southern Queensland
, Toowoomba, Queensland 4350, Australia
Search for other works by this author on:
David R. Buttsworth
Faculty of Engineering and Surveying,
University of Southern Queensland
, Toowoomba, Queensland 4350, Australiae-mail: david.buttsworth@usq.edu.au
Abdalla Agrira
Faculty of Engineering and Surveying,
University of Southern Queensland
, Toowoomba, Queensland 4350, Australia
Ray Malpress
Faculty of Engineering and Surveying,
University of Southern Queensland
, Toowoomba, Queensland 4350, Australia
Talal Yusaf
Faculty of Engineering and Surveying,
University of Southern Queensland
, Toowoomba, Queensland 4350, AustraliaJ. Eng. Gas Turbines Power. Feb 2011, 133(2): 022802 (5 pages)
Published Online: October 25, 2010
Article history
Received:
September 25, 2009
Revised:
October 11, 2009
Online:
October 25, 2010
Published:
October 25, 2010
Citation
Buttsworth, D. R., Agrira, A., Malpress, R., and Yusaf, T. (October 25, 2010). "Simulation of Instantaneous Heat Transfer in Spark Ignition Internal Combustion Engines: Unsteady Thermal Boundary Layer Modeling." ASME. J. Eng. Gas Turbines Power. February 2011; 133(2): 022802. https://doi.org/10.1115/1.4001080
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