Title
A parametric study on the whistling of multiple side branch system as a model for corrugated pipes
Author
Nakiboglu, G.
Belfroid, S.P.C.
Tonon, D.
Willems, J.F.H.
Hirschberg, A.
TNO Industrie en Techniek
Publication year
2010
Abstract
Corrugated pipes are widely used in industry due to their inherent character of being globally flexible and locally rigid. Under certain conditions flow through the corrugated pipes causes severe noise and vibration problems. Thus, to understand the phenomenon and parameters that play role is a real asset for industry. This study is a continuation of a research based on multiple side branch system and presented together with results of an investigation performed on corrugated pipes. Many similarities between the corrugated pipes and multiple side branch system have been observed. A Strouhal number which uses as characteristic length the cavity width plus the upstream edge radius yields the best collapse of the data for both corrugated pipes and multiple side branch system. For both systems the upstream edge radius of the cavity has significant effect on pressure fluctuation amplitudes. It can increase the amplitude of the pressure fluctuation by an order of magnitude compared to sharp edges. The radius of the downstream edge has a less pronounced effect on the sound production. Strouhal numbers display two hydrodynamic modes the first with a Strouhal number around 0.1 and the second one varying in the range between 0.4 and 0.6. The variation in critical Strouhal number for the second hydrodynamic mode correlates with the relative corrugation volume compared to the pipe volume. Experiments with corrugated pipes reveal that 1st hydrodynamic mode is limited to configuration with small relative corrugation volume. The first hydrodynamic mode was not yet observed in the multiple side-branch systems. Copyright © 2009 by ASME.
Subject
Fluid Mechanics Chemistry & Energetics
FD - Fluid Dynamics
TS - Technical Sciences
Acoustics and Audiology
Energy / Geological Survey Netherlands
To reference this document use:
http://resolver.tudelft.nl/uuid:5623918b-e6ef-4303-8679-83bc0d566b49
TNO identifier
360808
Publisher
ASME
ISBN
9780791843673
ISSN
0277-027X
Source
2009 ASME Pressure Vessels and Piping Conference, PVP 2009, 26 July 2009 through 30 July 2009, Prague. American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP, 4, 389-398
Document type
conference paper