A.O.Borisyuk Experimental study of the wall pressure in tube with a stenosis |
Acoustic bulletin, Vol. 5 ¹ 1, (2002) |
| Wall pressure in a pipe behind a stenotic narrowing is studied. Sharp increase of pressure in a finite region immediately downstream the stenosis and presence of pronounced pressure maximum upstream the point of re-attachment of separated flow was found. Approximate estimates both for the distance from a stenosis to the point of maximum pressure and the pressure magnitude at this point were obtained. Study of the wall pressure power spectrum allowed to discover low-frequency maxima. They were found to be determined by the appropriate large-scale eddies in the regions of separated and re-attached flow, and their frequencies are close to the characteristic frequencies of the eddies' formation. These maxima are the main distinguishing features of the spectrum under investigation compared to the wall pressure fluctuation spectrum in a fully-developed turbulent pipe flow. |
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KEY WORDS: pipe flow, stenosis, wall pressure, separated flow, attached flow |
| TEXT LANGUAGE: Ukrainian |