Naturally occurring and forced azimuthal modes in a turbulent jetNaturally occurring instability modes in an axisymmetric jet are studied utilizing the modal frequency spectrum method. In the early evolution of the jet the axisymmetric mode was predominant, with the azimuthal modes growing quickly but dominating only after the end of the potential core. The growth of the azimuthal modes is seen nearer to the nozzle exit for the jet in the laminar boundary layer case than for the turbulent. Based on the results from these naturally occurring jet instability mode tests, target modes for efficient excitation were determined and two cases of excitation were examined.
Document ID
19920053374
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Raman, Ganesh (NASA Lewis Research Center; Sverdrup Technology, Inc. Brook Park, OH, United States)
Rice, Edward J. (NASA Lewis Research Center Cleveland, OH, United States)
Reshotko, Eli (Case Western Reserve University Cleveland, OH, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Subject Category
Fluid Mechanics And Heat Transfer
Meeting Information
Meeting: ASME and JSME Joint Fluids Engineering Conference