The effect of grazing-bias flow on the self sustained oscillations in a side branch
2010 (English)In: 20th International Congress on Acoustics 2010, ICA 2010 - Incorporating Proceedings of the 2010 Annual Conference of the Australian Acoustical Society, 2010, 176-181 p.Conference paper (Refereed)
The flow-acoustic interaction in a T-junction can result in both amplification and attenuation of incoming waves. The frequency ranges of amplification are mainly governed by the time scales of convection of hydrodynamic instabilities over the side branch opening. With bias flow, i.e. flow through the side branch the amplification can increase or completely vanish. In this paper this effect is studied for a T-junction of rectangular ducts, with a grazing Mach number of 0.1 and a varying bias inflow. When the bias inflow Mach number changes from 0 to 0.01 the amplification is increased severely. Further increasing the bias inflow has the effect of lower the amplification again towards zero at a bias Mach number of 0.05.
Place, publisher, year, edition, pages
2010. 176-181 p.
Flow-acoustic interaction, Flowthrough, Frequency ranges, Hydrodynamic instabilities, Inflow Mach number, Rectangular ducts, Self-sustained oscillations, Side branches, T junctions, Time-scales
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-26141ScopusID: 2-s2.0-84869137211ISBN: 978-161782745-7OAI: oai:DiVA.org:kth-26141DiVA: diva2:370445
20th International Congress on Acoustics 2010, ICA 2010 - Incorporating the 2010 Annual Conference of the Australian Acoustical Society; Sydney, NSW; Australia; 23 August 2010 through 27 August 2010
FunderSwedish Research Council
QC 201011182010-11-162010-11-162014-08-15Bibliographically approved