Fulltext

Acoustic forcing on swirling flow: experiments and simulation

Hubschmid, W. ; Denisov, A. ; Biagioli, F.

In: Experiments in Fluids, 2014, vol. 55, no. 9, p. 1-12

Ajouter à la liste personnelle
    Titre
    • Acoustic forcing on swirling flow: experiments and simulation
    Auteur
    • Hubschmid, W.. Paul Scherrer Institut, 5232, Villigen, Switzerland
    • Denisov, A.. Paul Scherrer Institut, 5232, Villigen, Switzerland
    • Biagioli, F.. Alstom Switzerland, 5242, Birr, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Experiments in Fluids, 2014, vol. 55, no. 9, p. 1-12. Springer Berlin Heidelberg
    Autre version électronique
    Classification
    • Technologie, Sciences de l'ingénieur
    Identifiant OAI-PMH
    • oai:doc.rero.ch:325139
    Summary
    We investigated the effect of sound irradiated from loudspeakers on the flow of preheated air in the combustion chamber of a swirl burner. The temporally periodic pattern of the flow generated by the sound was detected by fast particle image velocimetry (PIV), with a repetition rate that was adapted to the observation of 12 phase angles of the irradiated monochromatic sound. The strong observed movement of the air is related to the movement by the sound itself, as determined by the pressure measurements with microphones. The PIV measurements reveal also a nonlinear interaction between the irradiated sound and the precession of the vortex core. The accuracy of the sound measurements was tested by determining in quiescent air the acoustic velocity by microphones and as well by PIV; good agreement was obtained thereby. Numerical calculations, using large eddy simulation and accounting for the sound forcing by variation in the mass flow at the inlet of the computational domain, approximately reproduce some of the experimental results.