The charge motion in the diesel engine is determined by the geometry of the intake port. Charge exchange losses occur, because the ports are designed as a compromise between charge motion (swirl) and flow rate. These losses can be reduced by optimising the intake ports with regard to the flow rate while neglecting the charge motion. In this case, the charge motion can be generated by an external energy source. The necessary energy should be introduced at a suitable location in order to generate the required charge motion by means of fluidic vortex generators. The aim is to reduce the charge exchange work while improving the combustion process to increase the efficiency of the engine.
The overall efficiency of the diesel engine can be increased through the targeted generation of the charge movement, despite the need for an additional energy source. The extent of the potential is to be determined here. The parameters for generating the swirl movement will also be analysed.
[1] Ritter, J., Kahraman, A., Wenz, E., Scholz, P. and Eilts P., "Achieving Enhanced Swirl with Vortex Generating Jets in a Light-Duty Direct-Injected Diesel Engine," SAE Technical Paper 2025-24-0016, 2025, https://doi.org/10.4271/2025-24-0016.
[2] Kahraman, A., Ritter, J., Eilts, P., and Scholz, P., "Simulation of Swirl and Discharge Coefficient Trade-off for Diesel Engine Intake Ports," SAE Technical Paper 2025-24-0007, 2025, https://doi.org/10.4271/2025-24-0007.
Firstly, intake ducts are generated parametrically and analysed for flow and swirl characteristics. This is done both by means of CFD simulation at the ISM and on the stationary flow test rig at the IVB. Based on this preliminary investigation, an intake duct geometry is incorporated into an existing diesel engine. Using this newly constructed engine, parameter studies are carried out in a towed state. The results are also used to validate an adapted CFD model. Based on these results, an entire engine is simulated to analyse the effects on the overall efficiency and the combustion process.