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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.9

ISSN Imprimir: 2152-5102
ISSN On-line: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v32.i2.40
pages 184-198

Velocity Fluctuations in a Swirling Jet of a Vortex Chamber

V. V. Babenko
Institute of Hydromechanics of National Academy of Sciences of Ukraine, Kyiv, Ukraine
V. A. Blohin
Institute of Hydromechanics of National Academy of Sciences of Ukraine, Kyiv, Ukraine
A. V. Voskoboinick
Institute of Hydromechanics of National Academy of Sciences of Ukraine 8/4, Zhelyabov St., Kyiv, 03057, Ukraine
V. N. Turick
Institute of Hydromechanics of National Academy, of Sciences of Ukraine, Kyiv, Ukraine

RESUMO

The paper deals with results of experimental research concerning distributions of spectral density components of a longitudinal and transversal power of a turbulent near-wall jet's velocity fluctuations in the vortical chamber. A contribution of various frequency components of the spectral densities to the total energy of the velocity fluctuation field is shown vs. variable jet's tangential chamber entrance angles, azimuth angles against the inlet nozzle, and normal distances to the chamber's wall flowed around by the jet. A swirling stream's core is more saturated by small-scale high-frequency vortices in comparison with a near-wall jet field where large-scale vortical systems predominate. As the azimuth angle of an incoming jet increases, longitudinal vortex scales get bigger in a near-wall jet field, and their contribution to the total fluctuation energy grows.


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