Results of an experimental investigation of axisymmetric jet that was subjected to radial and azimuthal forcing at a Reynolds number of 5200 are reported. Subharmonic forcing at Strouhal numbers of 0.1 and 0.125 attenuated large coherent structures in the initial region of the jet, resulting in an overall reduction in turbulence levels and the turbulent kinetic energy. Forcing also resulted in the velocity decay and spreading of the jet. Proper orthogonal decomposition analysis of the particle image velocimetry data revealed exchange of modal energy to higher modes and highlighted streamwise vortex filaments located between successive large-scale structures of the jet. These filaments play a pivotal role in the entrainment of ambient fluid. The meandering and distortion of the vortex filaments increased due to additional strain imposed by the forcing.
Axisymmetric Jet Subjected to Radial and Azimuthal Forcing
Journal of Propulsion and Power ; 32 , 2 ; 311-324
2015-11-24
14 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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