Browse Publications Technical Papers 630076
1963-01-01

A DIGITAL COMPUTER SIMULATION FOR SPARK-IGNITED ENGINE CYCLES 630076

A comprehensive cycle analysis has been developed for four-stroke spark-ignited engines from which the indicated performance of a single cylinder engine was computed with a reasonable degree of accuracy. The step-wise cycle calculations were made using a digital computer. This analysis took into account mixture composition, dissociation, combustion chamber shape (including spark plug location), flame propagation, heat transfer, piston motion, engine speed, spark advance, manifold pressure and temperature, and exhaust pressure.
A correlation between the calculated and experimental performance is reported for one engine at a particular operating point. The calculated pressure-time diagram was in good agreement with the experimental one in many respects. The calculated peak pressure was 10 per cent lower and the thermal efficiency 0.8 per cent higher than the measured values. Thus this calculational procedure represents a significant improvement over constant volume cycle approximations.
When the procedure was developed it was used to study the influence of varying the rates of flame propagation and heat transfer on the performance of this engine. In addition the availability and irreversibility of the working fluid were determined as a function of crank angle.
It appears that this is a valid approach for predicting spark-ignited engine cycle behavior and the effects of changing operating variables. Moreover it offers great potential in the study of the importance to the engine cycle of phenomena such as turbulence, heat transfer, and the influence of combustion chamber shape.

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

Influence of Gas Exchange and Volumetric Efficiency on Knock Behavior in a Spark-Ignition Engine

980894

View Details

TECHNICAL PAPER

Unburned Mixture Heat-Transfer Surface vs Mass Fraction Burned Correlation for Application in Single- and Two-Zone Models of SI Engine Cycle

2022-01-0379

View Details

TECHNICAL PAPER

Parametric Study of Transient Turbocharged Diesel Engine Operation from the Second-Law Perspective

2004-01-1679

View Details

X