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雾化与喷雾
影响因子: 1.262 5年影响因子: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN 打印: 1044-5110
ISSN 在线: 1936-2684

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雾化与喷雾

DOI: 10.1615/AtomizSpr.2013006361
pages 97-118

NUMERICAL ANALYSIS OF THE INFLUENCE OF DIESEL NOZZLE DESIGN ON INTERNAL FLOW CHARACTERISTICS FOR 2-VALVE DIESEL ENGINE APPLICATION

Joaquin De la Morena
Engine Research Center, University of Wisconsin-Madison, Madison, WI 53076, USA
Kshitij Neroorkar
Department of Mechanical & Industrial Engineering, University of Massachusetts, Amherst, MA 01003, USA
Alejandro H. Plazas
General Motors Global Research and Development, Warren, MI 48090-9055, USA
Richard C. Peterson
General Motors Global Research and Development, Warren, MI 48090-9055, USA
David P. Schmidt
Department of Mechanical and Industrial Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003, USA

ABSTRACT

The current paper studies the potential effect of using tilted injectors on internal nozzle flow characteristics. This kind of injector has been commonly chosen for 2-valve diesel engines. In order to achieve similar spray targeting in a 4-valve configuration, the injector design needs to be modified, inducing a different angle on each of the nozzle holes with respect to the injector axis. To study the implications of this kind of nozzle design, a vertical and a tilted injector have been analyzed for two kinds of hole shape: tapered, which suppresses cavitation; and cylindrical, which is more prone to cavitating flow. A two-component surrogate model has been used to emulate the physical properties of a typical commercial diesel fuel. Full three-dimensional flow simulations have been performed, using a flash boiling model to capture the phase transition induced by cavitation. The simulations have been conducted at the full needle lift condition. The results show that there is a significant influence of hole angle on the mass flow distribution through the nozzle, as well as on the flow pattern and the outlet velocity profile, leading to an asymmetric spray distribution inside the combustion chamber. It is also demonstrated that cavitation formation is affected by the hole angle.


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