Erscheint 12 Ausgaben pro Jahr
ISSN Druckformat: 1044-5110
ISSN Online: 1936-2684
Indexed in
NUMERICAL ANALYSIS OF THE INFLUENCE OF DIESEL NOZZLE DESIGN ON INTERNAL FLOW CHARACTERISTICS FOR 2-VALVE DIESEL ENGINE APPLICATION
ABSTRAKT
The current paper studies the potential effect of using tilted injectors on internal nozzle flow characteristics. This kind of injector has been commonly chosen for 2-valve diesel engines. In order to achieve similar spray targeting in a 4-valve configuration, the injector design needs to be modified, inducing a different angle on each of the nozzle holes with respect to the injector axis. To study the implications of this kind of nozzle design, a vertical and a tilted injector have been analyzed for two kinds of hole shape: tapered, which suppresses cavitation; and cylindrical, which is more prone to cavitating flow. A two-component surrogate model has been used to emulate the physical properties of a typical commercial diesel fuel. Full three-dimensional flow simulations have been performed, using a flash boiling model to capture the phase transition induced by cavitation. The simulations have been conducted at the full needle lift condition. The results show that there is a significant influence of hole angle on the mass flow distribution through the nozzle, as well as on the flow pattern and the outlet velocity profile, leading to an asymmetric spray distribution inside the combustion chamber. It is also demonstrated that cavitation formation is affected by the hole angle.
-
Salvador F.J., Carreres M., Jaramillo D., Martínez-López J., Analysis of the combined effect of hydrogrinding process and inclination angle on hydraulic performance of diesel injection nozzles, Energy Conversion and Management, 105, 2015. Crossref
-
Gao Jian, Cuneo Giacomo, Numerical Simulation of Intake Port and In-Cylinder Flow in a Two-Valve Multi-Cylinder Diesel Engine, SAE Technical Paper Series, 1, 2016. Crossref
-
López J Javier, de la Garza Oscar A, De la Morena Joaquin, Martínez-Martínez S, Effects of cavitation in common-rail diesel nozzles on the mixing process, International Journal of Engine Research, 18, 10, 2017. Crossref
-
Salvador F.J., Lopez J.J., De la Morena J., Crialesi-Esposito M., Experimental investigation of the effect of orifices inclination angle in multihole diesel injector nozzles. Part 1 – Hydraulic performance, Fuel, 213, 2018. Crossref
-
Salvador Francisco J., de la Morena Joaquin, Carreres Marcos, Jaramillo David, Numerical analysis of flow characteristics in diesel injector nozzles with convergent-divergent orifices, Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 231, 14, 2017. Crossref
-
Salvador F. J., De la Morena J., Bracho G., Jaramillo D., Computational investigation of diesel nozzle internal flow during the complete injection event, Journal of the Brazilian Society of Mechanical Sciences and Engineering, 40, 3, 2018. Crossref
-
Villafranco Dorien O., Gupta Ankush, Ryan Emily M., Holt R. Glynn, Grace Sheryl M., An Assessment of Homogeneous Mixture Method Cavitation Models in Predicting Cavitation in Nozzle Flow, Journal of Fluids Engineering, 143, 1, 2021. Crossref
-
Payri R., Salvador F.J., De la Morena J., Pagano V., Using a one-dimensional spray model to improve liquid length and ignition delay estimations for diesel flames, Applied Thermal Engineering, 124, 2017. Crossref