Two-dimensional visualization of ignition kernels in an IC engine

Journal Article · Wed Jul 01 04:00:00 EDT 1987 · Combust. Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(87)90021-6· OSTI ID:5776655

Loye, A O.Z.; Bracco, F V

Ignition kernels in a ported premixed-charge spark-ignition engine were examined using 2-dimensional visualization. A pulsed laser sheet was passed through the engine and the Mie scattering by the TiO/sub 2/ seeding particles was collected by a 100 x 100 pixel diode array with a field of view of 1 cm x 1 cm, and then digitized. The engine used a stoichiometric propane-air mixture and was operated at 300, 1200, and 3000 rpm. It is concluded that the turbulent flow field affected all the kernels examined, which included kernels as small as 2 mm and times after ignition as short as 100 ..mu..s. Increasing distortion and cycle-to-cycle variations in the ignition kernel with increasing engine speed were noted. Locally the flame front is often no thicker than the 200 ..mu..m resolution limit of the system. This implies that the turbulent flames are in the reaction sheet regime.

• Research Organization: Dept. of Mechanical and Aerospace Engineering, Princeton Univ., Princeton, NJ 08544
• OSTI ID: 5776655
• Journal Information: Combust. Flame; (United States), Journal Name: Combust. Flame; (United States) Vol. 69:1; ISSN CBFMA
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330102* -- Internal Combustion Engines-- Diesel
AIR
ALKANES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
DIGITAL SYSTEMS
ELECTROMAGNETIC RADIATION
ENGINES
FLAME PROPAGATION
FLAMES
FLUID FLOW
FLUIDS
FUEL SUBSTITUTION
GASES
HEAT ENGINES
HYDROCARBONS
IGNITION
IGNITION QUALITY
INTERNAL COMBUSTION ENGINES
KERNELS
KINETICS
LASER RADIATION
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PROPANE
PULSES
RADIATIONS
REACTION KINETICS
SCATTERING
SPARK IGNITION ENGINES
STOICHIOMETRY
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TURBULENT FLOW
TWO-DIMENSIONAL CALCULATIONS
VELOCITY