Visualisation of Gasoline and Exhaust Gases Distribution in a 4-Valve SI Engine; Effects of Stratification on Combustion and Pollutants

961928

10/01/1996

Event
1996 SAE International Fall Fuels and Lubricants Meeting and Exhibition
Authors Abstract
Content
An indirect method to map the burned gases in SI engine has been developed. It is based on visualisation by Laser Induced Fluorescence of the unburned mixture seeded with biacetyl. Both internally and externally recirculated burned gases are monitored. This diagnostic is complementary to the LIF technique applied to measure the gasoline distribution. These LIF gasoline and burned gases measurements are applied in a 4-valve optical access SI engine for a large range of operating conditions. These include variations of both fuel injection and burned gas recirculation modes causing different types of stratification leading to very distinct heat release and exhaust emissions characteristics. Tumble level and spark location are also modified. The observation of the actual stratification in the engine forms a sound basis explanation of the engine performance. Parameters allowing an optimisation of NOx and HC levels can be inferred, and in particular the effectiveness of recirculation and fuel injection strategies. The conclusions are confirmed by measurements in a single engine cylinder conventional head with the same geometry.
Meta TagsDetails
DOI
https://doi.org/10.4271/961928
Pages
15
Citation
Deschamps, B., and Baritaud, T., "Visualisation of Gasoline and Exhaust Gases Distribution in a 4-Valve SI Engine; Effects of Stratification on Combustion and Pollutants," SAE Technical Paper 961928, 1996, https://doi.org/10.4271/961928.
Additional Details
Publisher
Published
Oct 1, 1996
Product Code
961928
Content Type
Technical Paper
Language
English