Given the engine geometry, speed, equivalence ratio, and inlet manifold conditions, a computer simulation of the Wankel engine operating cycle predicts mass flows of fuel and air, chamber pressure, unburned and burned gas temperatures, heat transfer, gas leakage, and quenching. From these variables, engine power, efficiency, average heat transfer, leakage, and hydrocarbon emissions are computed. Each of the three chambers in a single engine rotor housing is treated as an open thermodynamic system, connected via the apex seal leakage path. Values for the effective seal leakage area and the turbulent heat transfer coefficient deduced from experimental data on a Toyo Kogyo 12B engine under both motoring and firing conditions show reasonable agreement with predicted values. Results of parametric studies show that a 10% reduction in leakage and heat transfer would improve specific fuel consumption by 1.7% and 2%, respectively (at 2000 rpm, mid-load conditions).

  • Availability:
  • Supplemental Notes:
    • Presented at the SAE Congress and Exposition, Detroit, 27 February-3 March 1978. Research sponsored by Ford Motor Company.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Danieli, G A
    • Keck, J C
    • Heywood, J B
  • Publication Date: 1978

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00395866
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: SAE 780416, HS-025 477U
  • Files: HSL, USDOT
  • Created Date: Jul 31 1985 12:00AM