Browse Publications Technical Papers 2000-01-0960
2000-03-06

A Modeling and Experimental Study of Initial Flame Kernel Development and Propagation in SI Engines 2000-01-0960

In spark ignition engines, the mechanism of transferring electrical energy from an ignition system into the mixture in the spark gap is controlled by many aspects. The major parameters of these aspects are inputs of electrical energy, combustion energy release, and heat transfers. Heat caused by combustion energy is transferred to the spark plug, cylinder head, unburned mixture, and others.
This study presents the development and validation of a flame kernel initiation and propagation model in SI engines, and most of the aspects described above are considered during the course of the model development. Furthermore, the model also takes into account the strain rate of the initial kernel and residual gas fraction.
The model is validated by the engine experiments, which are conducted in a constant volume combustion chamber. During the experiments, some test conditions are considered, and these conditions are as follows: air-fuel ratio, electrical characteristics of ignition systems, dwell time and spark plug gap. The velocity of the initial flame kernel development is measured by a laser deflection method.
From the simulation and experiment study, the following results are confirmed: the breakdown energy plays an important role in initial kernel development. As the dwell time is made longer, and the spark plug gap width is extended, the early flame propagation becomes faster.

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

The Effect of Knock on Heat Transfer in SI Engines

2002-01-0238

View Details

TECHNICAL PAPER

A Technique for the Real-Time Estimation of Air-Fuel Ratio Using Molecular Weight Ratios

900260

View Details

TECHNICAL PAPER

How to Improve SI Engine Performances by Means of Supercritical Water Injection

2019-24-0235

View Details

X