Effect of Nozzle Orifice Diameter
High-Speed Schlieren Movies of Diesel Sprays
| Parameter | Small Orifice Diameter | Large Orifice Diameter |
|---|---|---|
| Ambient O2 [%] | 21 | 21 |
| Ambient Temperature [K] | 1000 | 1000 |
| Ambient Density [kg/m3] | 28 | 28 |
| ΔPinj [MPa] | 136 | 137 |
| Orifice Diameter [mm] | 0.200 | 0.260 |
Fuel is #2 diesel fuel. Injector tip to wall is 109 mm.
The penetration rate decreases with decreasing orifice diameter (Naber, 1996).
The momentum of the spray scales with nozzle area for sprays with the same injection pressure above ambient.