Stratified cold start sprays of gasoline-ethanol blends
Journal article, 2009

Gasoline and gasoline-ethanol sprays from an outward-opening piezo-injector were studied in a constant volume/pressure chamber using high-speed imaging and phase doppler anemometry (PDA) under stratified cold start conditions corresponding to a vehicle ambient temperature of 243 K (-30 °C/-22 °F); in-cylinder air pressure of 5 bar, air temperature of 350 K (-30 °C/-22 °F) and fuel temperature of 243 K. The effects of varying in-cylinder pressure and temperature, fuel injection pressure and fuel temperature on the formation of gasoline, E75 and pure ethanol sprays were investigated. The results indicate that fuel composition affects spray behaviour, but less than expected. Furthermore, varying the temperature of the fuel or the air surrounding the spray also had minor effects. As expected, the fuel injection pressure was found to have the strongest influence on spray formation under stratified conditions.


Stina Hemdal

Chalmers, Applied Mechanics, Combustion

Ingemar Denbratt

Chalmers, Applied Mechanics, Combustion

Petter Dahlander

Chalmers, Applied Mechanics, Combustion

Jonas Wärnberg

General Motors

SAE International Journal of Fuels and Lubricants

19463952 (ISSN) 19463960 (eISSN)

Vol. 2 1 683-696

Subject Categories

Energy Engineering



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