Predicting chemical species in spark-ignition engines

• Published in: Energy (Oxford) Vol. 29; no. 3; pp. 449 - 465
• Main Authors: Selamet, Emel Evren, Selamet, Ahmet, Novak, James M.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 01-03-2004; Elsevier Science
• Subjects: Applied sciences; Energy; Energy. Thermal use of fuels; Engines and turbines; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Exhaust; Temperature; Combustion chamber; Simulation; Ignition; Carbon dioxide; Database; Combustion; Spark ignition engine; Performance; Pressure; Operating conditions
• ISSN: 0360-5442
• DOI: 10.1016/j.energy.2003.10.006

The unsteady motion of chemical species in the intake and exhaust ducts of spark-ignition internal combustion (I.C.) engines is studied numerically by employing a finite-difference-based engine simulation code. The time-dependent mass fractions of six dominant products (CO
2, H
2O, CO, H
2, O
2, N
2) combined with five additional minor species (H, NO, O, OH, N) are computed in the combustion chamber and tracked throughout the breathing system for wide-open-throttle as well as part-load operating conditions. The property calculations employ the NASA database to determine the composition. The effect of the number of product species on the engine performance and dynamic quantities, including pressure and temperature in the breathing system, is also investigated.