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Interaction of free-stream turbulence with screens and grids: a balance between turbulence scales

Published online by Cambridge University Press:  20 April 2006

J. Tan-Atichat ,
H. M. Nagib  and
R. I. Loehrke
J. Tan-Atichat
Affiliation:
Department of Mechanics and Mechanical Aerospace Engineering, Illinois Institute of Technology, Chicago
H. M. Nagib
Affiliation:
Department of Mechanics and Mechanical Aerospace Engineering, Illinois Institute of Technology, Chicago
R. I. Loehrke
Affiliation:
Department of Mechanical Engineering, Colorado State University, Fort Collins
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Abstract

Effects of screens and perforated plates (grids) on free-stream turbulence are studied in several test flow conditions. The level, structure and decay of the turbulence generated by such ‘manipulators’ depend in part on their shear-layer instabilities, and can therefore be modified by inserting additional devices immediately downstream. The performance of screens and some perforated plates is found to depend on the characteristics of the incoming flow such as velocity, turbulence level and spectra. Combinations of perforated plates and screens are found to be very effective flow manipulators. By optimizing the intermanipulator separation and carefully matching the scales between the manipulator pair, the turbulence decay rate downstream of a grid can be quadrupled.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 114 , January 1982 , pp. 501 - 528
Copyright
© 1972 Cambridge University Press

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