Skip to Main content Skip to Navigation
Journal articles

Experimental study of a free and forced swirling jet

Abstract : The present study concerns the response of a swirling jet to various azimuthal modes and frequencies forced at the nozzle exit. The different unforced dynamical states are first described as a function of the swirl setting, determined from measured velocity fields in the longitudinal plane using particle image velocimetry. A second experimental technique, based on laser induced fluorescence, is described, which is more suited to the description of the low-amplitude response of the jet to the forcing. It is shown that the receptivity of the jet is very poor when the forcing is set to the naturally prevailing azimuthal mode (m = 2) and frequency. In contrast, a strong response is observed for both co-rotating and counter-rotating forced azimuthal modes (m = ±2, m = ±3) for frequencies about one order of magnitude larger than the frequency prevailing in the absence of forcing. Finally, the present actuator is seen to be ineffective in preventing the appearance of vortex breakdown itself. © 2004 American Institute of Physics.
Complete list of metadatas

Cited literature [17 references]  Display  Hide  Download

https://hal-polytechnique.archives-ouvertes.fr/hal-01024955
Contributor : Denis Roura <>
Submitted on : Tuesday, July 29, 2014 - 3:31:00 PM
Last modification on : Thursday, March 5, 2020 - 6:29:28 PM
Long-term archiving on: : Monday, November 24, 2014 - 5:10:00 PM

File

1.1758171.pdf
Publisher files allowed on an open archive

Identifiers

Collections

Citation

François Gallaire, S. Rott, Jean-Marc Chomaz. Experimental study of a free and forced swirling jet. Physics of Fluids, American Institute of Physics, 2004, 16 (8), pp.2907-2917. ⟨10.1063/1.1758171⟩. ⟨hal-01024955⟩

Share

Metrics

Record views

448

Files downloads

897