An Approach to Charge Stratification in Lean-Burn, Spark- Ignition Engines

Paper #:
  • 941878

Published:
  • 1994-10-01
Citation:
Arcoumanis, C., Hull, D., and Whitelaw, J., "An Approach to Charge Stratification in Lean-Burn, Spark- Ignition Engines," SAE Technical Paper 941878, 1994, https://doi.org/10.4271/941878.
Pages:
15
Abstract:
A constant-volume combustion chamber was used to examine injection of a small quantity of slightly rich fuel/air mixture towards the spark plug around the time of ignition, in an overall very lean mixture rotating at velocities representative of modern spark-ignition engines. The results show that it is possible to achieve 100% ignitability with overall air-fuel ratios in excess of 50 and much faster burn rates than those with initially homogenous mixtures of the same equivalence ratio with high swirl and turbulence. The advantages of this method of local charge stratification have been demonstrated in terms of both pressure measurements and shadowgraphs of the early flame development while the transient characteristics of the injected rich mixture at the spark plug gap were monitored by a fast flame ionization detector. The implications of the proposed method for extending the lean limit of premixed fuel-air mixtures in spark-ignition engines are discussed and suggestions are made for its implementation in four-valve gasoline engines.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Select
Price
List
Download
$27.00
Mail
$27.00
Members save up to 40% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Training / Education
2017-12-18
Technical Paper / Journal Article
2010-10-25
Article
2017-03-13
Training / Education
2018-03-26