Effect of Ambient Gas Temperature

High-Speed Schlieren Movies of Diesel Sprays
ParameterLow Gas TemperatureModerate Gas TemperatureHigh Gas Temperature
Ambient O2 [%]212121
Ambient Temperature [K]80010001200
Ambient Density [kg/m3]282828
ΔPinj [MPa]138138138
Orifice Diameter [mm]0.2600.2600.260

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Fuel is #2 diesel fuel. Injector tip to wall is 109 mm.

The ignition delay (time from start of injection until start of combustion) decreases with increasing ambient temperature. After start of combustion, the spray penetration rate is approximately the same.