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Numerical Investigation of Spray Collapse in GDI with OpenFOAM

Gärtner, Jan Wilhelm; Feng, Ye; Kronenburg, Andreas ; Stein, Oliver Thomas ORCID iD icon

Abstract:

During certain operating conditions in spark-ignited direct injection engines (GDI), the injected fuel will be superheated and begin to rapidly vaporize. Fast vaporization can be beneficial for fuel–oxidizer mixing and subsequent combustion, but it poses the risk of spray collapse. In this work, spray collapse is numerically investigated for a single hole and the spray G eight-hole injector of an engine combustion network (ECN). Results from a new OpenFOAM solver are first compared against results of the commercial CONVERGE software for single-hole injectors and validated. The results corroborate the perception that the superheat ratio $R_p$, which is typically used for the classification of flashing regimes, cannot describe spray collapse behavior. Three cases using the eight-hole spray G injector geometry are compared with experimental data. The first case is the standard G2 test case, with iso-octane as an injected fluid, which is only slightly superheated, whereas the two other cases use propane and show spray collapse behavior in the experiment. The numerical results support the assumption that the interaction of shocks due to the underexpanded vapor jet causes spray collapse. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000158660
Veröffentlicht am 12.05.2023
Originalveröffentlichung
DOI: 10.3390/fluids6030104
Scopus
Zitationen: 12
Dimensions
Zitationen: 8
Cover der Publikation
Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2311-5521
KITopen-ID: 1000158660
Erschienen in Fluids
Verlag MDPI
Band 6
Heft 3
Seiten Art.-Nr.: 104
Vorab online veröffentlicht am 04.03.2021
Externe Relationen Siehe auch
Schlagwörter GDI, spray collapse, shock interaction, flash boiling, HRM Model
Nachgewiesen in Dimensions
Scopus
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