Ducted Fuel Injection: An Experimental Study on Optimal Duct Size
2022-01-0543
03/29/2022
- Event
- Content
- Ducted fuel injection (DFI) was implemented in a constant flow High Temperature Pressure Vessel (HTPV) at 60bar ambient pressure, 800-1000K ambient temperature, 21% oxygen. The ducts were 14mm long and placed approximately 3mm away from the orifice exit. The duct diameters ranged from 1.6-3.2mm and had a rounded inlet and a tapered outlet. Diesel fuel was used in a single-orifice fuel injector operating at a rail pressure of 250MPa, where the orifice diameters ranged from 150-219µm. The objective of this work was to study soot reduction for various combinations of orifice diameter in relation to duct diameter. Several combinations of orifice and duct diameters were tested. A complete data set was taken using the 150µm orifice. The results clearly show that soot reduction peaks at an optimal duct size of 2-2.25mm and is reduced as the duct diameter is increased or decreased. A smaller number of test points were also taken using the 169 and 219µm orifices, showing similar trends, although with faster declines in soot reduction as one moves away from the optimum. Very high soot reduction can be achieved at 800K regardless of the orifice/duct combination suggesting that soot is controlled by chemistry. At 1000K less soot reduction is seen, and the optimal duct size is less pronounced.
- Citation
- Svensson, K., Fitzgerald, R., and Martin, G., "Ducted Fuel Injection: An Experimental Study on Optimal Duct Size," SAE Technical Paper 2022-01-0543, 2022, .