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Atomization and Sprays
Facteur d'impact: 1.262 Facteur d'impact sur 5 ans: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v6.i3.20
pages 257-284

SPRAY VISUALIZATION AND HYDRAULIC CHARACTERIZATION OF THE HOLES OF A FIVE-HOLE, VALVE-COVERED-ORIFICE NOZZLE OF AN ELECTRONICALLY CONTROLLED DIESEL INJECTOR

R. Campanella
Istituto di Macchine ed Energetica, Politecnico di Bari, Bari, Italy
V. Damiani
ELASIS, Sistema Ricerche FIAT nel Mezzogiorno, Centre Alimentazione Motori, Z.I. Modugno, Modugno, Italy
D. Laforgia
Dipartimento di lngegneria dell'Innovazione, Universita di Lecce, Lecce, Italy

RÉSUMÉ

A study of the spray of a standard, five-hole, valve-covered-orifice (V.C.O.) nozzle for D.I. diesel engines has been carried out, several pictures of the spray coming from each hole have been taken using the back-light photography technique. Injected volume and duration, supply pressure, spray penetration, angle, and diameter, and flash delay from start of injection have been measured; each spray depends strongly on the needle lift. The causes of such differences have been attributed to the different inclination of the holes, the asymmetric feeding condition of the holes (due to the eccentricity between needle and nozzle), and the microdefects caused by the drilling operation.


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