Effect of Piston Shape and Swirl Ratio on Engine Heat Transfer in a Light-Duty Diesel Engine

Helgi Fridriksson, Martin Tunér, Öivind Andersson, Bengt Sundén, Håkan Persson, Mattias Ljungqvist

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review

33 Citations (SciVal)


Heat transfer losses are one of the largest loss contributions in a modern internal combustion engine. The aim of this study is to evaluate the contribution of the piston bowl type and swirl ratio to heat losses and performance. A commercial CFD tool is used to carry out simulations of four different piston bowl geometries, at three engine loads with two different swirl ratios at each load point. One of the geometries is used as a reference point, where CFD results are validated with engine test data. All other bowl geometries are scaled to the same compression ratio and make use of the same fuel injection, with a variation in the spray target between cases. The results show that the baseline case, which is of a conventional diesel bowl shape, provides the best emission performance, while a more open, tapered, lip-less combustion bowl is the most thermodynamically efficient. The results also show that the effects of swirl are not consequent throughout all piston geometries, as the flow field response to swirl variations is different in the various piston geometries.
Original languageEnglish
Title of host publicationSAE Technical Papers
Number of pages13
Publication statusPublished - 2014
EventSAE 2014 World Congress & Exhibition - Detroit, Michigan, United States
Duration: 2014 Apr 8 → …


ConferenceSAE 2014 World Congress & Exhibition
Country/TerritoryUnited States
CityDetroit, Michigan
Period2014/04/08 → …

Subject classification (UKÄ)

  • Energy Engineering


  • Swirl ratio
  • Piston shape
  • Diesel Engine
  • Heat Transfer
  • CFD


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