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

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Author

Summary, in English

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.

Publishing year

2014

Language

English

Publication/Series

SAE Technical Papers

Document type

Conference paper

Publisher

SAE

Topic

  • Energy Engineering

Keywords

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

Conference name

SAE 2014 World Congress & Exhibition

Conference date

2014-04-08

Conference place

Detroit, Michigan, United States

Status

Published