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An experimental investigation of planar countercurrent turbulent shear layers

Published online by Cambridge University Press:  10 May 2005

DAVID J. FORLITI ,
BRIAN A. TANG  and
PAUL J. STRYKOWSKI
DAVID J. FORLITI
Affiliation:
Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA Present address: Department of Mechanical and Aerospace Engineering, State University of New York at Buffalo, Buffalo, NY 14260, USA.
BRIAN A. TANG
Affiliation:
Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA
PAUL J. STRYKOWSKI
Affiliation:
Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA
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Abstract

The spatial development of planar incompressible countercurrent shear layers was investigated experimentally. A facility was constructed to establish countercurrent shear layers without the formation of global stagnation in the flow. Particle image velocimetry was employed to obtain detailed measurements within the region of self-preservation for velocity ratios $U_{2}/U_{1}$ between 0 and −0.3. The spatial growth rate of countercurrent shear layers was found to agree generally with simple analytical theory. At 30% counterflow, the growth rate was approximately twice as large as the case with no counterflow. Peak turbulence quantities, when normalized by the applied shear magnitude, $\Delta U$, were found to be nominally constant for low levels of counterflow, but at counterflow velocities above 13% of the primary stream velocity, peak turbulence levels increased. The observed transition is accompanied by the development of mean flow three-dimensionality. The deviation occurs at a counterflow level that is in agree- ment with theoretical predictions for transition from convective to absolute instability.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 530 , 10 May 2005 , pp. 241 - 264
Copyright
© 2005 Cambridge University Press

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