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RESEARCH PAPERS

Statistical Characteristics of Velocity, Concentration, Mass Transport, and Momentum Transport for Coaxial Jet Mixing in a Confined Duct

[+] Author and Article Information
B. V. Johnson

Heat Transfer Technology, United Technologies Research Center, East Hartford, Conn. 06108

J. C. Bennett

Mechanical Engineering Department, University of Connecticut, Storrs, Conn. 06268

J. Eng. Gas Turbines Power 106(1), 121-127 (Jan 01, 1984) (7 pages) doi:10.1115/1.3239523 History: Received December 16, 1982; Online October 15, 2009

Abstract

An experimental study of mixing downstream of coaxial jets discharging into an expanded circular duct was conducted to obtain data for the evaluation and improvement of turbulent transport models currently used for combustor flow modeling. A combination of turbulent momentum transport rate and two velocity component data were obtained from simultaneous measurements with a two-color LV system. A combination of turbulent mass transport rate, concentration and velocity data were obtained from simultaneous measurements with laser velocimeter (LV) and laser induced fluorescence (LIF) systems. These measurements were used to obtain mean, second central moment, skewness and kurtosis values for three velocity components and the concentration. These measurements showed the existence of countergradient turbulent axial mass transport where the annular jet fluid was accelerating the inner jet fluid. Results from the study are related to the assumptions employed in the current mass and momentum turbulent transport models.

Copyright © 1984 by ASME
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