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Effects of spray-swirl interactions on heat losses in a light duty diesel engine

Dahlström, Jessica LU ; Andersson, Öivind LU ; Tunér, Martin LU and Persson, Hakan (2015) ASME 2015 International Mechanical Engineering Congress and Exposition, IMECE 2015 In Heat Transfer and Thermal Engineering 8A-2015.
Abstract

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.... (More)

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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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Heat Transfer and Thermal Engineering
volume
8A-2015
pages
11 pages
publisher
American Society Of Mechanical Engineers (ASME)
conference name
ASME 2015 International Mechanical Engineering Congress and Exposition, IMECE 2015
external identifiers
  • scopus:84982921308
ISBN
9780791857496
DOI
10.1115/IMECE2015-53606
language
English
LU publication?
yes
id
86a1a9f8-2634-41aa-98d3-6c2057ab335f
date added to LUP
2016-12-21 08:22:03
date last changed
2017-02-19 04:43:46
@inproceedings{86a1a9f8-2634-41aa-98d3-6c2057ab335f,
  abstract     = {<p>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.</p>},
  author       = {Dahlström, Jessica and Andersson, Öivind and Tunér, Martin and Persson, Hakan},
  booktitle    = {Heat Transfer and Thermal Engineering},
  isbn         = {9780791857496},
  language     = {eng},
  pages        = {11},
  publisher    = {American Society Of Mechanical Engineers (ASME)},
  title        = {Effects of spray-swirl interactions on heat losses in a light duty diesel engine},
  url          = {http://dx.doi.org/10.1115/IMECE2015-53606},
  volume       = {8A-2015},
  year         = {2015},
}