Effect of Ambient Gas Density

High-Speed Schlieren Movies of Diesel Sprays
ParameterLow DensityHigh Density
Ambient O2 [%]2121
Ambient Temperature [K]10001000
Ambient Density [kg/m3]1458
ΔPinj [MPa]136137
Orifice Diameter [mm]0.2600.260

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

The spray penetration rate decreases with increasing ambient density (Naber, 1996) because of higher momentum exchange with the ambient.