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Effects of heat release on the large-scale structure in turbulent mixing layers

Published online by Cambridge University Press:  26 April 2006

P. A. Mcmurtry ,
J. J. Riley  and
R. W. Metcalfe
P. A. Mcmurtry
Affiliation:
University of Utah, Salt Lake City, UT 84112, USA
J. J. Riley
Affiliation:
University of Washington, Seattle, WA 98195, USA
R. W. Metcalfe
Affiliation:
University of Houston, Houston, TX 77004, USA
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Abstract

The effects of chemical heat release on the large-scale structure in a chemically reacting, turbulent mixing layer are investigated using direct numerical simulations. Three-dimensional, time-dependent simulations are performed for a binary, single-step chemical reaction occurring across a temporally developing turbulent mixing layer. It is found that moderate heat release slows the development of the large-scale structures and shifts their wavelengths to larger scales. The resulting entrainment of reactants is reduced, decreasing the overall chemical product formation rate. The simulation results are interpreted in terms of turbulence energetics, vorticity dynamics, and stability theory. The baroclinic torque and thermal expansion in the mixing layer produce changes in the flame vortex structure that result in more diffuse vortices than in the constant-density case, resulting in lower rotation rates of the large-scale structures. Previously unexplained anomalies observed in the mean velocity profiles of reacting jets and mixing layers are shown to result from vorticity generation by baroclinic torques.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 199 , February 1989 , pp. 297 - 332
Copyright
© 1989 Cambridge University Press

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