Browse Publications Technical Papers 950727
1995-02-01

A Study of the Cycle-to-Cycle Variation of In-Cylinder Flow in a Motored Engine Through Digital Image Processing of Visualized Images 950727

An experimental study investigating the cyclic variation of the internal air motion has been made in a motored engine having a cup-in-piston combustion chamber. The engine used for this study has a transparent quartz liner and a transparent plastic (acrylic resin) piston. The light source used to produce sheet was a 4 watt argon ion laser with continuous wave beam. The brightness irregularity patterns of particle groups were recorded photographically by a NAC E-10 high speed camera and the bulk flow fields inside of the combustion chamber have been measured at both planes parallel and vertical to the piston crown by means of image processing technique.
This paper for the first time reveals the continuous cycle-resolved two-dimensional bulk flow fields inside of the combustion chamber around the compression TDC. Also, comparison between cycle-resolved and ensemble-averaged flow patterns has shown that ensemble-averaged flow pattern may become a artificial one if there exists the large effect of the cyclic variation. Moreover, by examining into the rms of the variation component and the ratios of the rms to ensemble-averaged velocity under with/without swirl conditions, it is found that the ratios of the rms to ensemble-averaged velocity can be used for evaluating the effect of the cyclic variation on the flow fields.

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

New Laser Particle Sizing Instrument

770140

View Details

TECHNICAL PAPER

An Insight Into Effect of Split Injection on Mixture Formation and Combustion of DI Gasoline Engines

2004-01-1949

View Details

TECHNICAL PAPER

Optical Investigations of a Gasoline Direct Injection Engine

1999-01-3688

View Details

X