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Atomization and Sprays

Publication de 12  numéros par an

ISSN Imprimer: 1044-5110

ISSN En ligne: 1936-2684

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 1.2 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 1.8 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.3 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00095 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.28 SJR: 0.341 SNIP: 0.536 CiteScore™:: 1.9 H-Index: 57

Indexed in

EXPERIMENTAL AND NUMERICAL STUDY OF INTERNAL FLOW AND SPRAY CHARACTERISTICS FOR ELLIPTICAL ORIFICE UNDER TYPICAL DIESEL ENGINE OPERATION CONDITIONS

Volume 28, Numéro 8, 2018, pp. 713-733
DOI: 10.1615/AtomizSpr.2018025820
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RÉSUMÉ

The elliptical orifice has potential benefits for improving spray and air-fuel mixing quality, which have a great impact on combustion and emission performances for a diesel engine. This paper presents experimental and numerical studies on the internal flow and spray characteristics for an elliptical orifice with a large aspect ratio and circular orifice of diesel nozzles, under real diesel engine operation conditions. Large eddy simulation and Schnerr and Sauer models were adopted to study the cavitation flow, and the numerical models were validated first, regarding the mass flow rate and cavitation morphology. Two CCD cameras were adopted to acquire the macro elliptical spray images at the minor and major view planes, simultaneously. The results indicated that the discharge coefficient of the elliptical orifice was higher than that of the circular orifice, which indicated that the elliptical orifice has better flow performance as compared to the circular orifice. Also, the vapor volume fraction at the orifice exit for circular orifice was greater than that of the elliptical orifice, while the vorticity magnitudes were consistently lower than that of elliptical orifice under same injection conditions. Moreover, the cavitation distribution in the elliptical orifice in the direction of major axis shows longer length than that in the minor axis direction, and the cavitation morphology at the elliptical orifice exit showed a unique horseshoe shape, while the cavitation morphology for circular orifice was still distributing symmetrically. Furthermore, the spray width of the elliptical spray was greater than that of the circular one in all the view planes. Elliptical spray exhibited an axis-switching phenomenon during the injection process even at high injection pressure and back-pressure. Finally, the spray tip penetration of the circular orifice was always longer than that of the elliptical orifice; whereas, the spray cone angles of the circular orifice were much smaller than that of the elliptical orifice.

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