Cyclic Variability in Spark Ignition Engines A Literature Survey

What fuel properties enable higher thermal efficiency in spark-ignited engines?

Cyclic variations of initial flame kernel growth in a Honda VTEC-E lean-burn spark-ignition engine

This article presents results from a comprehensive optical study of a direct-injection spark-ignition research engine running on gasoline, iso-octane, ethanol, n-butanol and E10 fuels injected from a multi-hole central vertically positioned injector. The analysis was based on images of spray development, spark discharge and combustion to understand the effects of early and late injection strategies on in-cylinder phenomena. Specifically, `single'-injection strategies from early to late intake stroke as well as multiple `split' injection events with triple pulses in the early intake stroke or double pulses in the intake stroke and late compression stroke were investigated. The engine was run at 1500 r/min at part- and full-load conditions (0.5 and 1.0 bar inlet plenum pressure, respectively). Engine coolant temperatures of 20°C–90°C were employed to understand how fuel volatility was related to the phenomena observed. The sprays were imaged over a series of cycles primarily by laser sheet illumination on o...

/pdf/an-experimental-database-on-the-effects-of-single-and-split-59heagmff3.pdf

An experimental database on the effects of single- and split injection strategies on spray formation and spark discharge in an optical direct-injection spark-ignition engine fuelled with gasoline, iso-octane and alcohols

Y. S. Cho

Papers

The Effect of Spark Power on Spark-Ignited Flame Kernel Growth