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

ISSN Печать: 2152-5102
ISSN Онлайн: 2152-5110

Выпуски:
Том 47, 2020 Том 46, 2019 Том 45, 2018 Том 44, 2017 Том 43, 2016 Том 42, 2015 Том 41, 2014 Том 40, 2013 Том 39, 2012 Том 38, 2011 Том 37, 2010 Том 36, 2009 Том 35, 2008 Том 34, 2007 Том 33, 2006 Том 32, 2005 Том 31, 2004 Том 30, 2003 Том 29, 2002 Том 28, 2001 Том 27, 2000 Том 26, 1999 Том 25, 1998 Том 24, 1997 Том 23, 1996 Том 22, 1995

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v31.i2.50
16 pages

Experimental Study of Wall Pressure Fluctuations in a Pipe behind a Cylindrical Insertion with Eccentricity

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

Краткое описание

The wall pressure fluctuations in a pipe behind a cylindrical insertion with eccentricity are studied. Sharp increase of the pressure in a finite region immediately downstream of the insertion, as well as the presence of a pronounced pressure maximum upstream of the point of re-attachment of the separated flow are found. The approximate estimates both for the distance from an axisymmetric insertion to the point of maximal pressure and the pressure magnitude at this point are obtained. The study of the wall pressure power spectrum reveals low-frequency maxima. These are the main distinguishing features of the spectrum under investigation compared to the wall pressure fluctuation spectrum in a fully-developed turbulent pipe flow. These maxima are found to be determined by the appropriate large-scale vortices in the regions of separated and reattached flows, and their frequencies are close to the characteristic frequencies of the vortices formation. The study of the effect of the insertion's eccentricity on the wall pressure statistical characteristics shows that the frequency spectrum is more sensitive to the changes in the eccentricity compared to the root-mean-square pressure.