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Elliptic jets, part 2. Dynamics of coherent structures: PairingThe dynamics of the jet column mode of vortex pairing in the near field of an elliptic jet was investigated. Hot-wire measurements and flow visualization were used to examine the details of the pairing mechanism of nonplanar vortical elliptic structures and its effect on such turbulence measures as coherent velocities, incoherent turbulence intensities, incoherent and coherent Reynolds, stresses, turbulence production, and mass entrainment. It was found that pairing of elliptic vortices in the jet column does not occur uniformly around the entire perimeter, unlike in a circular jet. Merger occurs only in the initial major-axis plane. In the initial minor-axis plane, the trailing vortex rushes through the leading vortex without pairing and then breaks down violently, producing considerably greater entrainment and mixing than in circular or plane jets.
Document ID
19920011130
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Husain, Hyder S. (Houston Univ. TX, United States)
Hussain, Fazle (Houston Univ. TX, United States)
Date Acquired
September 6, 2013
Publication Date
February 24, 1992
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NAS 1.26:189902
NASA-CR-189902
Accession Number
92N20372
Funding Number(s)
CONTRACT_GRANT: DE-FG05-88ER-13839
CONTRACT_GRANT: NAG3-639
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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