SIMULATION OF THERMODYNAMIC CYCLE OF THREE-VALVE STRATIFIED CHARGE ENGINE

A simulation model of the thermodynamic cycle of a three-valve stratified charge engine is described, with particular reference to the combustion process. Computed pressure and temperature/crankangle diagrams compare satisfactorily with experimental data, except for a large discrepancy in the temperature/crankangle diagrams in one case. There is qualitative agreement between predicted and experimental values of the major exhaust emissions. There is also good agreement between the computed equivalence ratio in the auxiliary chamber and the measured value for an operating condition. The adequacy of the simulation model of the thermodynamic cycle for analyzing the performance of a three-valve stratified charge engine is proved by the following calculations: mass flow, gas temperature, and velocity through the torch opening during the combustion period; mass flow rate and temperature of exhaust gases through the exhaust valve; gas pressure and temperature during exhaust and intake processes; and mass flow through the main and auxiliary intake valves. The model seems to be inadequate for measuring cylinder gas temperature in the main chamber during the combustion period and needs to be modified by considering such factors as the mixture formation and the mixing of jet flame in the main combustion chamber.

• Supplemental Notes:
  • Presented at the SAE Congress and Exposition, Detroit, 27 February-3 March 1978.
• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Asanuma, T
  • Gajendra Babu, M K
  • Yagi, S
• Publication Date: 1978

Media Info

• Features: References;
• Pagination: 19 p.

Subject/Index Terms

• TRT Terms: Combustion; Exhaust gases; Performance; Simulation; Stratified charge engines; Thermodynamics
• Subject Areas: Safety and Human Factors;

Filing Info

• Accession Number: 00395648
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: SAE 780319, HS-025 417U
• Files: HSL, USDOT
• Created Date: Jun 30 1985 12:00AM