MODELLING STUDY OF THE FUEL CONSUMPTION AND NO/SUB X/ EMISSIONS OF SPARK-IGNITION ENGINES OVER A RANGE OF DESIGN AND OPERATING CONDITIONS

A computer simulation of the four-stroke spark-ignition engine cycle has been developed for studies of the effects of variations in engine design and operating parameters on engine performance, efficiency, and NO emissions. The simulation computes the flows into and out of the engine, calculates the changes in thermodynamic properties and composition of the unburned and burned gas mixtures within the cylinder through the engine cycle due to work, heat and mass transfers, and follows the kinetics of NO formation and decomposition in the burned gas. The combustion process is specified as an input to the program through use of a normalized rate of mass burning profile. The simulation predicts mass flow rates through the intake and exhaust valves, cylinder pressure, unburned and burned gas temperatures, rate of heat transfer to the combustion chamber walls, thermal boundary layer thickness, and NO concentration throughout the engine cycle for given engine geometry, speed, intake and exhaust manifold conditions. From these profiles, engine power, fuel consumption, and NO emissions are computed.

  • Corporate Authors:

    Massachusetts Institute of Technology

    Department of Civil Engineering, 77 Massachusetts Avenue
    Cambridge, MA  USA  02139

    Department of Energy

    1000 Independence Avenue, SW
    Washington, DC  USA  20585
  • Authors:
    • Heywood, J B
    • TABACZYNSKI, R J
    • Higgins, J M
    • Watts, P A
  • Publication Date: 1978-7

Media Info

  • Pagination: 101 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00198461
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Contract Numbers: EY-76-S-02-2881
  • Files: TRIS
  • Created Date: Oct 17 1979 12:00AM