Journal
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
Volume 76, Issue -, Pages 108-116Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.icheatmasstransfer.2016.05.033
Keywords
Nozzle; avitation; Experimental visualization; LES; Shedding of cloud cavitation
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Funding
- National Natural Science Foundation of China [51176066, 51276084]
- Priority Academic Program Development of Jiangsu High Education Institutions
- Six Talent Peaks Project of Jiangsu Province [2013-JNHB-017]
- Specialized Research Fund for the Doctoral Program of Higher Education [21033227110007]
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Shedding of cloud cavitation in a nozzle orifice is a common phenomenon of cavitation instability which has a great influence on erosion damage and spray atomization process, but it hasn't been studied in details and the mechanism remains unclear. In this paper, visualization experiments and Large Eddy Simulation (LES) were carried out to study the process of periodic cloud cavitation shedding and re-entrant jet happened in a 2 mm-width nozzle with fuel of diesel. Numerical and experimental images provide a better insight into this physical mechanism. The results show that cavitation inception is formed at the edge of inlet and the recirculation zone which below the shear layer. Then the attached cavitation grows and shedding of cloud cavitation occurs due to the re-entrant jet located between cavity and wall. Moreover, the dynamic mechanism causing shedding of cloud cavitation is a combination of shedding vortex and pressure fluctuations. Cavitation shedding frequency can also be measured by experiment and numerical simulation. As a result, inception of cavitation, re-entrant jet and cavitation cloud shedding are accurately predicted by LES in accordance with the quantitative images observed in the experiment. (C) 2016 Elsevier Ltd. All rights reserved.
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