Publicado 6 números por año
ISSN Imprimir: 2152-5102
ISSN En Línea: 2152-5110
Indexed in
Experimental Study of the Wall Pressure Fluctuations in Elastic Pipe Behind a Local Axisymmetric Narrowing
SINOPSIS
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.