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Atomization and Sprays
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ISSN Imprimir: 1044-5110
ISSN En Línea: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v9.i4.70
pages 419-429

TURBULENCE UNDER QUASI-CAVITATING CONDITIONS: A NEW SPECIES?

Francisco Ruiz
Department of Mechanical, Materials, and Aerospace Engineering, Illinois Institute of Technology, Chicago, Illinois, USA
Lu He
Key Laboratory of Enhanced Heat Transfer & Energy Conservation, South China University of Technology, Guangzhou, 510640, China

SINOPSIS

This article presents measurements of turbulent fluctuations in an upscaled, two-dimensional model of a plain-orifice injector, with and without the presence of cavitation simulated by an air bubble. The measurements were made at different locations in the orifice cross section, and at different planes along the direction of the flow. Two-color laser Doppler velocimetry data allowed the calculation of Reynolds stresses as well as turbulence power spectra. The results show that the turbulence in the presence of simulated or quasi-cavitation behaves quite differently from the case without cavitation: it changes more radically with changes on the Reynolds number and seems to be fairly independent of the magnitude of the Reynolds stresses. These observations cannot be explained by using conventional shear-induced turbulence models. Experiments with forced cavity fluctuations show an increased receptivity at certain frequencies.


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