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Cavitation and Hydraulic Flip in the Outward-Opening GDi Injector Valve-Group
Technical Paper
2009-01-1483
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
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.
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Authors
- B. Befrui - Delphi Customer Technology Centre, G.-D. Luxembourg
- G. Corbinelli - Delphi Customer Technology Centre, G.-D. Luxembourg
- G. Hoffmann - Delphi Customer Technology Centre, G.-D. Luxembourg
- R. J. Andrews - Delphi Technical Centre Gillingham, U.K.
- S. R. Sankhalpara - Delphi Technical Centre Gillingham, U.K.
Topic
Citation
Befrui, B., Corbinelli, G., Hoffmann, G., Andrews, R. et al., "Cavitation and Hydraulic Flip in the Outward-Opening GDi Injector Valve-Group," SAE Technical Paper 2009-01-1483, 2009, https://doi.org/10.4271/2009-01-1483.Also In
SI Combustion and Direct Injection SI Engine Technology, 2009
Number: SP-2241; Published: 2009-04-20
Number: SP-2241; Published: 2009-04-20
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