Large Eddy Simulation of Turbulent Flows in a Laboratory Reciprocating Engine

  • T. Joelsson
  • R. Yu
  • X. S. Bai
Conference paper
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM, volume 117)

Abstract

Large eddy simulation (LES) of turbulent flows in an experimental reciprocating internal combustion engine was carried out. The engine had a rectangular shaped combustor geometry and rectangular channel intake and exhaust manifolds with a large optical window to allow for detailed two-dimensional velocity field measurement in the entire combustion chamber. The objectives of this work were to study the structures of the tumble flow and turbulence in the combustion chamber and to examine different approaches for characterizing the incylinder turbulent flows. LES were performed for two different engine configurations, one with the intake channel included in the simulation and one with intake flow modeled as a simple plug flow at the exit of the intake channel, to investigate the effect of intake flow on the tumble flow and turbulence. The convergence of cycle-averaged statistics was investigated. It was found that for the ensemble averaged mean flow field 10 cycles LES could give reasonably converged mean velocity; however, more than 60 cycles were needed to generate converged rms of velocity fluctuation. A global turbulence intensity defined based on single cycle LES or PIV data was analyzed. This quantity was shown to characterize the overall turbulence intensity in the cylinder reasonably well.

Keywords

Large Eddy Simulation Large Eddy Simulation Result Crank Angle Degree Intake Stroke Intake Flow 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • T. Joelsson
    • 1
  • R. Yu
    • 1
  • X. S. Bai
    • 1
  1. 1.Division of Fluid Mechanics, Dept. of Energy SciencesLund UniversityLundSweden

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