Spray Characteristics of Hydrous Ethanol in Multi-hole Direct Injector

Abstract:

Hydrous ethanol has the advantages of high-octane number and valuable oxygen content， and can reduce the energy consumption and emission in the production process. By application of high-speed cameras and constant volume bomb system， the spray characteristics of 95% hydrous ethanol was studied at different temperatures and fuel injection back pressures with a direct injection gasoline injector with five holes. The spray shape， penetration distance， spray cone angle， spray width， spray projection area， and the flash boiling phenomenon were analyzed and compared with those of pure gasoline. The results show that the penetration distance of hydrous ethanol spray is larger than that of gasoline in cold state， decreases with the increase of back pressure， and increases with the increase of oil temperature. The spray cone angle is smaller than that of gasoline and decreases with the increase of back pressure. In the complete flash boiling state， the spray penetration distance increases， the spray cone angle decreases significantly， the spray width increases in the area near the nozzle， and the spray width decreases in the area far away from the nozzle. Simultaneously， the spray projection area is mainly affected by the spray back pressure.

Key words:hydrous ethanol;multi-hole direct injector;spray characteristics;flash boiling