3D-CFD In-Nozzle Flow Simulation and Separate Row Injection Rate Measurement as preparatory steps for a detailed Analysis of Multi-Layer Nozzles

Multilayer nozzles for diesel engines with parallel or convergent nozzle hole arrangement and small noz-zle hole diameters offer the potential to combine good mixture preparation with high spray penetration and air utilization at medium and higher load engine operating points. Advanced experimental injection rate measurement and 3D CFD in-nozzle flow simulation allow the determination of the detailed boundary conditions at the nozzle outlet for layer I and II of the nozzle and show that also for equally sized holes especially during the phase of needle opening different injection rates occur for upper and lower row