Buttsworth, David R. and Agrira, Abdalla and Malpress, Ray and Yusaf, Talal (2010) Simulation of instantaneous heat transfer in spark ignition internal combustion engines: unsteady thermal boundary layer modelling. In: ICEF 2009: ASME Internal Combustion Engine Division Fall Technical Conference, 27-30 Sep 2009, Lucerne, Switzerland.
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 restrictive assumptions regarding isentropic processes applying in the gas external to the thermal boundary layer are necessary. 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.
|Item Type:||Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)|
|Additional Information:||ICEF2009-14056. Permanent restricted access to paper due to publisher copyright restrictions. This paper is Copyright © 2009 by ASME.|
|Uncontrolled Keywords:||internal combustion engines; thermal boundary layer modelling; energy equation; heat transfer correlation; isentropic; quasi-steady; spark ignition; temporal and spatial variation; thermal boundary layer; thermodynamic modelling; turbulent conductivity; unsteady thermal boundary|
|Subjects:||290000 Engineering and Technology|
|Depositing User:||Dr Talal Yusaf|
|Date Deposited:||21 Dec 2009 05:58|
|Last Modified:||02 Jul 2013 23:28|
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