Browse Publications Technical Papers 922171
1992-10-01

Correlation of Cycle-Resolved Flame Kernel Growth and Cylinder Pressure in an Optically-Accessible Engine 922171

Flame kernel growth and cylinder pressure data were simultaneously obtained from an optically-accessible, square piston, SI engine. Flame kernel growth was measured using simultaneous, orthogonal, Schlieren photography, while cylinder pressure was measured using a piezoelectric pressure transducer. The data were analyzed on a cycle-resolved basis to determine the correlation between cyclic fluctuations in flame kernel growth and cylinder pressure.
The engine was operated at 875 RPM with premixed, prevaporized, stoichiometric isooctane in air. The engine, designed with ported intake and exhaust, was fired every tenth cycle to ensure complete scavenging. Tests were conducted with and without nitrogen dilution, while ignition timing was fixed at 25° BTDC. With 0% dilution the percent variation in the maximum cylinder pressure was 8.5%, while with 10% dilution the percent variation increased to 14%.
The correlations between the fluctuation in flame kernel radius and the fluctuation in maximum cylinder pressure and maximum cylinder pressure rise rate were found to increase with increasing flame kernel size from a value of approximately 0.45, when the flame kernel radius was 5mm, to a value of approximately 0.75, when the flame kernel radius was 10mm. The correlations were somewhat greater for maximum cylinder pressure than for maximum cylinder pressure rise rate, while the effect of dilution was negligible.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Preview Document Add to Cart
Members save up to 16% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Mixture Preparation During Cranking in a Port-Injected 4-Valve SI Engine

972982

View Details

TECHNICAL PAPER

Warm-Up Characteristics of Surface Temperatures in an I.C. Engine Measured by Thermal Imaging Technique

920187

View Details

TECHNICAL PAPER

Spatial and Temporal Temperature Distributions in a Spark Ignition Engine Piston at WOT

2007-01-1436

View Details

X