Computation and measurement of flow and combustion in a four-valve engine with intake variations

B. Khalighi, S. H. El Tahry, D. C. Haworth, M. S. Huebler

Research output: Contribution to journalConference articlepeer-review

54 Scopus citations


A comprehensive modeling and visualization study of flow and combustion is reported for a production four-valve-per-cylinder homogeneous-charge four-stroke-cycle spark-ignited engine. Coupled port and in-cylinder computations are presented for five combinations of valve deactivation, valve shrouding, and cam profile. Motored (induction and compression) results are compared with transient-water-analog flow-structure visualizations. A new flamelet model for homogeneous-charge turbulent premixed combustion has been implemented for fired engine simulations. Several issues in the application of CFD to flow and combustion modeling in practical port-and-cylinder systems are addressed. These include numerical inaccuracy, elucidation of the role of induction-generated flow structure and turbulence, and new insights into premixed flame propagation. The results demonstrate the capability to capture differences in flow structure, turbulence generation, and flame propagation resulting from intake variations for real engines.

Original languageEnglish (US)
JournalSAE Technical Papers
StatePublished - 1995
Event1995 SAE International Congress and Exposition - Detroit, MI, United States
Duration: Feb 27 1995Mar 2 1995

All Science Journal Classification (ASJC) codes

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering


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