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雾化与喷雾
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ISSN 打印: 1044-5110
ISSN 在线: 1936-2684

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雾化与喷雾

DOI: 10.1615/AtomizSpr.v13.i56.80
pages 579-604

A CFD ANALYSIS OF THE INFLUENCE OF DIESEL NOZZLE GEOMETRY ON THE INCEPTION OF CAVITATION

V. Macian
CMT-Motores Termicos, Universidad Politecnica de Valencia, Valencia, Spain
Raul Payri
CMT–Motores Térmicos, Universitat Politècnica de València, Edificio 6D, Valencia, 46022, Spain
https://orcid.org/0000-0001-7428-5510
Xandra Margot
CMT-Motores Térmicos Edificio 6D Universitat Politècnica de València Camino de Vera s/n 46022 Valencia. Spain
F. J. Salvador
CMT-Motores Termicos, Universidad Politecnica de Valencia, Valencia, Spain

ABSTRACT

An extensive computational fluid dynamics (CFD) study has been performed in order to analyze the influence of nozzle geometry on the internal flow characteristics of a diesel injector. The flow through cylindrical and conical nozzles with different grades of hydro-grinding and at various needle lift positions and injection pressures was calculated to observe the individual effect of these parameters on the inception of cavitation. Most calculations were based on the assumption that the nozzle flow is axisymmetric. The set of calculations that was carried out to identify the most influential parameters for the onset of cavitation was determined by means of an experimental design technique. A correlation study was made in order to obtain a numerical expression that relates the critical cavitation number to geometric dimensions. Experiments were performed to validate both numerical calculations and conditions at which cavitation appears.


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