LES Predictions of the Vortical Flow Structures in Diesel Injector Nozzles Fluid Research Company

Format:

Conference/Event

Author/Creator:

Papoutsakis, A., author.

Conference Name:

SAE World Congress & Exhibition (2009-04-20 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2009

Summary:

Vortex flow realized inside the sac volume and the injection holes of automotive and heavy duty injectors plays an important role in the formation and development of cavitation and the near-nozzle structure of the emerging fuel sprays. Large-scale vortical flow structures are mainly induced by the geometric details of the injector. Vortex flow may be also induced by eccentric needle opening as well as the manufacturing tolerances of locations critical to the nozzle geometry such as the hole entry shape. The present paper assesses the predictive capability of a Large Eddy Simulation model against LDV measurements of the flow velocity obtained inside a transparent nozzle replica. Model predictions are compared also with RANS model predictions obtained using the standard k-ε model. The results indicate differences in the instantaneous flow pressure, velocity and vorticity fields obtained from the LES model, although the mean and rms velocity distribution do not differ substantially from the corresponding RANS ones

Notes:

Vendor supplied data

Publisher Number:

2009-01-0833

Access Restriction:

Restricted for use by site license