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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.v19.i3.30
pages 247-261

INFLUENCE OF VORTEX FLOW AND CAVITATION ON NEAR-NOZZLE DIESEL SPRAY DISPERSION ANGLE

A. Andriotis
Research Centre for Energy and the Environment, School of Engineering and Mathematical Sciences, City University London, Northampton Square, EC1V 0HB, UK
Manolis Gavaises
School of Mathematics, Computer Science, and Engineering, City University London, Northampton Square, EC1V 0HB London, United Kingdom

ABSTRACT

High-speed visualization of the cavitation structures formed inside single- and multihole transparent replicas of nozzles used with low-speed two-stroke diesel engines has been performed simultaneously with the near-nozzle spray dispersion angle resulting from the atomization process of the injected liquid. The nozzle designs investigated incorporate cylindrical as well as tapered holes. The two-phase nozzle flow structures appear in two distinct forms, referred to as geometric-induced cavitation and dynamic or string cavitation. Cylindrical holes induce cavitation while tapered holes suppress it, although cavitation strings have been monitored in all nozzle types. Comparison between cylindrical and tapered nozzles in the absence of string cavitation has allowed the influence of geometric cavitation to be quantified, while acquisition of high-speed images has allowed for comparison between images in the absence and presence of cavitation strings to be made. In addition, information is provided for the variation of the spray cone angle expressed in terms of the probability of finding dispersed liquid along the spray cone and its distribution function for the different nozzle designs. The results indicate a significant increase in the spray angle in the presence of cavitation strings that is more significant in the absence of geometric cavitation.


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