Heat loss is one of the greatest energy losses in engines. More than half of the heat is lost to cooling media and exhaust losses, and they thus dominate the internal combustion engine energy balance. Complex processes affect heat loss to the cylinder walls, including gas motion, spray-wall interaction and turbulence levels. The aim of this work was to study and improve the heat transfer characteristics of conventional diesel combustion. Speed, load, injection pressure, swirl level, EGR rate and air/fuel ratio (λ) were varied in a multi-cylinder engine. Temperature measurements in the engine cooling media were used to set up the engine energy balance and find out how much heat was lost to cooling media in different parts of the engine. Based on these calculations and heat release analysis, conclusions could be drawn regarding how heat losses in different parts of the engine were affected by changes in these parameters. Load was found to be more influential than speed, swirl did not have any effect on heat transfer, and EGR and λ both increased cooling water losses while piston losses were reduced.
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ASME 2015 International Mechanical Engineering Congress and Exposition
November 13–19, 2015
Houston, Texas, USA
Conference Sponsors:
- ASME
ISBN:
978-0-7918-5749-6
PROCEEDINGS PAPER
Effects of Spray-Swirl Interactions on Heat Losses in a Light Duty Diesel Engine
Jessica Dahlström,
Jessica Dahlström
Lund University, Lund, Sweden
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Öivind Andersson,
Öivind Andersson
Lund University, Lund, Sweden
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Håkan Persson
Håkan Persson
Volvo Car Corporation, Göteborg, Sweden
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Jessica Dahlström
Lund University, Lund, Sweden
Öivind Andersson
Lund University, Lund, Sweden
Martin Tunér
Lund University, Lund, Sweden
Håkan Persson
Volvo Car Corporation, Göteborg, Sweden
Paper No:
IMECE2015-53606, V08AT10A062; 11 pages
Published Online:
March 7, 2016
Citation
Dahlström, J, Andersson, Ö, Tunér, M, & Persson, H. "Effects of Spray-Swirl Interactions on Heat Losses in a Light Duty Diesel Engine." Proceedings of the ASME 2015 International Mechanical Engineering Congress and Exposition. Volume 8A: Heat Transfer and Thermal Engineering. Houston, Texas, USA. November 13–19, 2015. V08AT10A062. ASME. https://doi.org/10.1115/IMECE2015-53606
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