Browse Publications Technical Papers 2000-01-0900
2000-03-06

Analysis of a Stratified Charging Concept for High-Performance Two-Stroke Engines 2000-01-0900

This paper presents the results and conclusions from a conceptual design study for a stratified charging concept. The stratified charging engine has a displacement of 64 cm3 and a four-port design with reed valves at two ports to control the bypass air. During the intake stroke of the engine, bypass air is sucked into the transfer ports to purge the air-fuel mixture present in the ports from the previous stroke back into the crankcase. This fills the transfer ports near the exhaust with pure air at the beginning of the scavenging stroke. During scavenging, the bypass air is ejected in the cylinder, shielding the exhaust against the fresh mixture coming from the ports on the intake side. This allows the hydrocarbon emissions to be reduced by over 40 %.
The conceptual design study is based on an analysis of the mixture short-circuiting mechanisms and CFD investigations of the scavenging flow with charge stratification.

SAE MOBILUS

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

Access SAE MOBILUS »

Members save up to 18% 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 Transfer Port Geometry on Scavenge Flow Velocities at High Engine Speed

960366

View Details

TECHNICAL PAPER

SCAVENGE LOSS MECHANISMS AND THEIR DRIVING FORCES IN LOOP-SCAVENGED HIGH-PERFORMANCE TWO-STROKE ENGINES

2001-01-1826

View Details

TECHNICAL PAPER

Origins of Hydrocarbon Emissions from Diesel Engines

770259

View Details

X