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The vorticity field of acoustic modulated free jets
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2012 (English)In: Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics, ISSN 0253-231X, Vol. 33, no 10, 1811-1814 p.Article in journal (Refereed) Published
Abstract [en]

The motivation of this paper is to investigate the effects of acoustic modulation on the structures of free jet. Large eddy simulation is performed on three dimensional free jet of Re number 2200 with multigrid method. Comparisons of the vorticity fields are made between the unmodulated jet and perturbed jets with different modulation frequencies. When the modulation frequency is near the preferred mode of the natural jet, the flow field changes significantly. The azimuthal vorticity rolls up into large vortex rings, and the jet spreads more widely. When the modulation frequency is about the twice of the preferred mode, vortex pairing happens and the subharmonic wave becomes dominant. The flow fields are almost the same as the natural jet when the modula-tion frequency is much higher than the preferred mode. The distribution of streamwise vorticity is examined for the modulated jet near the preferred mode, and agrees qualitatively with the experiments.

Place, publisher, year, edition, pages
2012. Vol. 33, no 10, 1811-1814 p.
Keyword [en]
Acoustic modulation, Free jet, Large eddy simulation, Multi-grid method
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-106955ScopusID: 2-s2.0-84868633439OAI: diva2:574240
Swedish eā€Science Research Center

QC 20121205

Available from: 2012-12-05 Created: 2012-12-05 Last updated: 2013-04-08Bibliographically approved

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Fuchs, Laszlo
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