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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.2012004401
pages 461-492

INFLUENCE OF FUEL PROPERTIES ON THE DIESEL INJECTION PROCESS IN NONVAPORIZING CONDITIONS

J. Dernotte
Universite d'Orleans, Laboratoire Prisme, 8 rue Leonard de Vinci, 45072 Orleans Cedex, France ; PSA Peugeot-Citroen, Centre technique de Velizy, route de Gisy, 78943 Velizy-Villacoublay Cedex, France
Hespel Camille
université d'orleans
S. Houille
PSA Peugeot-Citroen, Centre technique de Velizy, route de Gisy, 78943 Velizy-Villacoublay Cedex, France
Fabrice Foucher
Universite d'Orleans, Laboratoire Prisme, 8 rue Leonard de Vinci, 45072 Orleans Cedex, France
Christine Mounaim-Rousselle
Universite d'Orleans, Laboratoire Prisme, 8 rue Leonard de Vinci, 45072 Orleans Cedex, France

ABSTRACT

This paper presents an experimental investigation of the influence of fuel density, viscosity, and surface tension on the diesel injection process (spray development and droplet size distribution) in non-vaporizing conditions. The spray development was captured in a pressurized vessel with a high-speed camera in order to obtain the penetration length and the spray angle. The droplet size distributions were measured by laser diffraction. A fuel matrix of eight fuels was designed including independent variations of fuel density, viscosity, and surface tension. Experimental conditions, such as injection pressure and air density, were varied according to current diesel engine conditions. The analysis focuses mainly on the quasi-stationary phase of the injection event. Results indicate that viscosity and to a lesser extent fuel density affect the spray characteristics. Increasing fuel density and viscosity by, respectively, 100 kg/m3 and 6.5 mm2/s induces longer spray tip penetration (up to 7%) with a narrower spray angle (drop of up to 3 deg) in quasi-stationary conditions. An increase in the Sauter mean diameter (up to 23% or 3 µm) was also observed. An increase in surface tension from 18 to 30 mN/m did not induce any significant modifications in the droplet size or in the spray development. Correlations, some of which are based on existing ones, are proposed to estimate the spray cone angle, the spray tip penetration, the SMD (Sauter mean diameter) and the drop size distribution considering the experimental conditions and the fuel properties.


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