Cavitation and Hydraulic Flip in the Outward-Opening GDi Injector Valve-Group Delphi Customer Technology Centre, G.-D. Luxembourg

Format:

Conference/Event

Author/Creator:

Befrui, B., 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:

Experimental (optical imaging) and CFD investigations of the cavitating flow in a transparent large-scale model of a GDi outward-opening injector, with a swirler-type valve-group, has been performed. The objective is to elucidate the flow structure within the valve group and assess a Reynolds-Averaged Navier-Stokes (RANS) multi-fluid simulation method.The optical imaging data show evidence of cavitation inception in the valve-group swirler-channels-caused by the rapid flow acceleration-and multiple cavitations within the conical nozzle region.The comparison of simulations with data shows that the CFD method reproduces the fluid dynamics of the valve-group with good qualitative agreement with the imaging data (with respect to the cavitation inception and geometry) and excellent quantitative agreement of the valve-group pressure drop-flow rate characteristic. In addition, the simulations reveal that the apparent cavitation in the conical nozzle region involves a "partial hydraulic flip" phenomena and entrainment of the ambient air

Notes:

Vendor supplied data

Publisher Number:

2009-01-1483

Access Restriction:

Restricted for use by site license