Design of a stratified scavenging two-stroke gasoline engine
WEI Jiazi
TANG Lichun
WANG Tinggao
Abstract：Taking a gasoline engine with a displacement of 50.8 mL for a matching chainsaw as the research object,this study uses a combination of simulation and bench testing to analyze the technology of reducing emissions and improving power of a stratified scavenging two-stroke gasoline engine.The results show that the specific emissions of HC-NOx and CO in a stratified sweep two-stroke gasoline engine decrease with the increasing of the excess air coefficient(λ),but the decrease in CO specific emissions is greater.When λ is 0.84,by using the asymmetric scavenging port,optimizing the spark plug position,changing the width of the squish band to 0.6～1.1 mm and the length to 3.5 mm,the HC-NOx emission ratio decreases to 52.23 g/(kW·h),which meets the design requirements.After reducing the piston ring surface pressure ratio,decreasing the piston ring height,and changing the piston ring material,the bench test calibration power increased to 2.24 kW,which meets the design requirements.
Keywords：gasoline enginestratified scavengingemissionpower
Publication Date：2024-12-28
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：6( 83-88 )