Instantaneous heat flux simulation of a motored reciprocating engine: unsteady thermal boundary layer with variable turbulent thermal conductivity

Agrira, Abdalla and Buttsworth, David R. and Said, Mior A. (2014) Instantaneous heat flux simulation of a motored reciprocating engine: unsteady thermal boundary layer with variable turbulent thermal conductivity. Journal of Heat Transfer: Transactions of the ASME, 136 (3). 031703 1-031703 9. ISSN 0022-1481

Abstract

Due to the inherently unsteady environment of reciprocating engines, unsteady thermal boundary layer modeling may improve the reliability of simulations of internal combustion engine heat transfer. Simulation of the unsteady thermal boundary layer was achieved in the present work based on an effective variable thermal conductivity from different turbulent Prandtl number and turbulent viscosity models. Experiments were also performed on a motored, single-cylinder spark-ignition engine. The unsteady energy equation approach furnishes a significant improvement in the simulation of the heat flux data relative to results from a representative instantaneous heat transfer correlation. The heat flux simulated using the unsteady model with one particular turbulent Prandtl number model agreed with measured heat flux in the wide open and fully closed throttle cases, with an error in peak values of about 6% and 35%, respectively.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2014 by ASME. Permanent restricted access to paper due to publisher copyright restrictions.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Date Deposited: 25 Jan 2015 08:00
Last Modified: 07 Jul 2016 06:24
Uncontrolled Keywords: heat transfer; internal combustion engine; unsteady model
Fields of Research : 09 Engineering > 0915 Interdisciplinary Engineering > 091508 Turbulent Flows
09 Engineering > 0902 Automotive Engineering > 090201 Automotive Combustion and Fuel Engineering (incl. Alternative/Renewable Fuels)
09 Engineering > 0915 Interdisciplinary Engineering > 091502 Computational Heat Transfer
Socio-Economic Objective: B Economic Development > 88 Transport > 8801 Ground Transport > 880199 Ground Transport not elsewhere classified
Identification Number or DOI: 10.1115/1.4025639
URI: http://eprints.usq.edu.au/id/eprint/26634

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