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RESEARCH PAPERS

Multijet Annulus/Core-Flow Mixing—Experiments and Calculations

[+] Author and Article Information
S. J. Baker

Department of Mechanical Engineering, Imperial College, London, SW7 2BX United Kingdom

J. J. McGuirk

Department of Transport Technology, Loughborough University, Leicestershire LE11 3TU United Kingdom

J. Eng. Gas Turbines Power 115(3), 473-479 (Jul 01, 1993) (7 pages) doi:10.1115/1.2906733 History: Received February 06, 1992; Online April 24, 2008

Abstract

LDV measurements are reported of the flow field associated with a single row of radially injected jets penetrating a core-tube flow. Emphasis is placed on the influence of small feed-annulus height on jet entry conditions and resulting trajectories and mixing patterns. Conditions of unstable jet behavior, with strong vortex patterns in the jet holes, were observed for small annulus heights and high annulus velocities. Most measurements were, however, taken under stable conditions to allow the data to be used in a CFD validation exercise. Significant differences in the strength of backflow generated at jet impingement and in the turbulence field in the immediate hole vicinity were observed for different annulus height/core diameter ratios. These were accompanied by jet trajectory and annulus flow structure changes. Measurements of all three mean velocity components and associated normal stresses enabled the data to be utilized to assess a three-dimensional CFD calculation incorporating a k-ε turbulence closure. The strength of forward and back flow generated at impingement was accurately predicted when the QUICK discretization scheme was used. However, the size of upstream vortex was overpredicted. As expected using an eddy viscosity model, the turbulence field at jet impingement and in the hole vicinity was not correctly reproduced. The turbulence generation in the flow approaching the hole was greatly overestimated by the turbulence model used.

Copyright © 1993 by The American Society of Mechanical Engineers
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