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Saturation and the limit of jet mixing enhancement by single frequency plane wave excitation: Experiment and theoryThe limitations of single frequency plane wave excitation in mixing enhancement are investigated for a circular jet. Measurements made in an 8.8 cm diameter jet are compared with a theoretical model. The measurements are made to quantify mixing at excitation amplitudes up to 2 percent of the jet exit velocity. The initial boundary layer state, the exit mean and fluctuating velocity profiles and spectra are documented for all cases considered. The amplitude of the fundamental wave is recorded along the jet axis for various levels of excitation. As the amplitude of excitation is increased the jet spreading rate is increased, but beyond a saturation amplitude further increases have no effect on the spreading. The experimental results are compared with theoretical estimates. In the theory the flow is split into the mean flow, large scale motions, and fine scale turbulence. Shape assumptions for the mean flow, and fine scale turbulence along with the shape for the large scale motions obtained from a linear stability theory provide the closure. The experimental results compare reasonably well with predictions.
Document ID
19880014348
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Raman, Ganesh (Sverdrup Technology, Inc. Cleveland, OH., United States)
Rice, Edward J. (NASA Ames Research Center Moffett Field, CA., United States)
Mankbadi, Reda R. (Brown Univ. Providence, R. I., United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1988
Subject Category
Aerodynamics
Report/Patent Number
E-4115
NASA-TM-100882
NAS 1.15:100882
Accession Number
88N23732
Funding Number(s)
PROJECT: RTOP 505-62-21
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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