The effect of swirl on combustion in a pancake chamber spark ignition engine

Conference · Fri Jan 01 00:00:00 EST 1988

OSTI ID:6487358

Mikulec, A; Kent, J C; Tabaczynski, R J

This experimental investigation is an initial step in separating the influences of swirl and inducted kinetic energy on combustion in a homogeneous charge engine. By rotation of the intake port about the axis of the intake valve, the swirl ratio was varied from zero to 2.8 while maintaining constant intake port flow, and hence constant inducted kinetic energy. Combustion data were obtained at a low speed, light load operating point (1500 RPM/60 psi IMEP) with MBT spark timing. The effects of the increase in swirl were a 25% decrease in ignition delay, a 10% decrease in combustion duration, and a significant improvement in combustion stability. Estimates were made on the effect of swirl on turbulence intensity (10% increase) and integral length scale (10% decrease). Both the increase in swirl and the use of a near-central spark plug location improved the lean operability. This enabled the ISFC to be reduced by more than 11% compared with the case of peripheral spark plug and zero swirl at equal combustion stability. In this comparison, the reduced ISFC via lean operation was accompanied by a decrease in ISNO/sub x/ from > 16 to 0.4 and an increase in ISHC from < 1.9 to 6.8 gm/IHP-HR.

• OSTI ID: 6487358
• Report Number(s): CONF-880241-
• Resource Relation: Conference: Society of Automotive Engineers international congress and exposition, Detroit, MI, USA, 29 Feb 1988; Other Information: Technical Paper 880200
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
COMBUSTION CHAMBERS
VORTEX FLOW
SPARK IGNITION ENGINES
COMBUSTION KINETICS
COMBUSTION CONTROL
FUEL INJECTION SYSTEMS
KINETIC ENERGY
OPERATION
TURBULENCE
VALVES
CHEMICAL REACTION KINETICS
CONTROL
CONTROL EQUIPMENT
ENERGY
ENGINES
EQUIPMENT
FLOW REGULATORS
FLUID FLOW
FUEL SYSTEMS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
KINETICS
REACTION KINETICS
330101* - Internal Combustion Engines- Spark-Ignition