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Mass and momentum turbulent transport experiments with confined swirling coaxial jets. IAn experimental study of mixing downstream of swirling coaxial jets discharging into an expanded duct was conducted to obtain data for the evaluation and improvement of turbulent transport models currently used in a variety of computational procedures throughout the combustion community. A combination of laser velocimeter and laser induced fluorescence techniques was employed to obtain mean and fluctuating velocity and concentration distributions which were used to derive mass and momentum turbulent transport parameters currently incorporated into various combustor flow models. Flow visualization techniques were also employed to determine qualitatively the time dependent characteristics of the flow and the scale of turbulence. Mean and fluctuating velocity profiles and probability density functions were obtained at selected axial and radial locations throughout the flow field. Mixing occurred in several steps of axial and radial mass transport and was coupled with a large radial mean convective flux. Major mixing regions were observed to occur (1) at the interface between the inner stream and the centerline recirculation zone, and (2) at the interface between the inner jet and the annular jet streams. Mixing for swirling flow was completed in one-third the length required for nonswirling flow.
Document ID
19840052877
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Johnson, B. V.
(United Technologies Research Center East Hartford, CT, United States)
Roback, R.
(United Technologies Research Center East Hartford, CT, United States)
Date Acquired
August 12, 2013
Publication Date
June 1, 1984
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
AIAA PAPER 84-1380
Accession Number
84A35664
Funding Number(s)
CONTRACT_GRANT: NAS3-22771
Distribution Limits
Public
Copyright
Other

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