Original scientific paper
INFLUENCE OF HOLE GEOMETRY IN THE CAVITATION PHENOMENA OF DIESEL INJECTORS, A NUMERICAL INVESTIGATION
Altin Dorri
orcid.org/0000-0002-6808-1519
; Polytechnic University of Tirana
Andonaq Lamani (Londo)
; Polytechnic University of Tirana
Artan Hoxha
; Polytechnic University of Tirana
Abstract
In order to evidenciate the effects of the hole shape in the generation of the spray, in high pressure diesel nozzles, a numerical investigation has been carried out. In particular the effect of cylindrical and non-cylindrical hole geometry on spray characteristics has been investigated in order to understand the relationship between nozzles geometry and in-nozzle flow features. Different hole shapes (convergent conical, divergent conical and cylindrical) are tested using the finite-volume CFD code FLUENT 5.5 at different fuel injection pressures. Simulation was done with pressure between 40 MPa and 140 MPa, and 50 µm needle lift. In the CFD simulations the pressure contours, the flux line, velocity vectors and the mass flow rate of the fuel inside the nozzle have been studied. Results have shown that variation of pressure inside of the holes changes notably according to the conicity. Volumetric fraction behavior of three injectors was very different
Keywords
flow cavitation; diesel engine fuel injection devices; injection nozzle, design and construction; computer methods and modeling
Hrčak ID:
43457
URI
Publication date:
30.9.2009.
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