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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

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

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v33.i4.60
pages 379-389

Experimental Study of the Wall Pressure Fluctuations in Elastic Pipe Behind a Local Axisymmetric Narrowing

A. O. Borisyuk
Institute of Hydromechanics of the National Academy of Sciences of Ukraine, Zhelyabov Str., 8/4, 03680, Kyiv-180, MSP, Ukraine

RESUMO

Wall pressure fluctuations pt in an elastic pipe behind a local axisymmetric narrowing are studied. Sharp increase in the pressure pt in a finite region immediately downstream the narrowing and the presence of a pronounced pressure maximum upstream the point of jet re-attachment were found. The study of the wall pressure power spectrum, P(f), has revealed the low-frequency maximums in it. The maximums were found to be determined by the appropriate large-scale eddy structures in the regions of separated and reattached flow, and their frequencies were close to the characteristic frequencies of the eddies formation. A comparative analysis of the data for rigid-walled and elastic pipes shows that the wall elasticity causes the changes in the flow structure and the corresponding redistribution of the flow energy among the vortices. This results in the increase of the wall pressure amplitude and the level of the wall pressure power spectrum, P(f), at low frequencies, as well as appearance of new frequency components in this domain.