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Active control of laminar-turbulent transition

Liepmann, H. W. and Nosenchuck, D. M. (1982) Active control of laminar-turbulent transition. Journal of Fluid Mechanics, 118 . pp. 201-204. ISSN 0022-1120.

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Instability waves, commonly called T-S waves, can be introduced in a laminar boundary layer by periodic heating of flush-mounted heating elements. Experiments have demonstrated that nearly complete cancellation of a T-S wave excited in this way can be achieved by using a second downstream heating element with a suitable phase shift. As one application of the technique, a single element together with a feedback loop activated by measured wall shear stress has been used to reduce the amplitude of naturally occurring laminar instability waves. A significant increase in the transition Reynolds number has been achieved.

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Additional Information:© 1982 Cambridge University Press. Received 21 November 1981. Published online: 20 April 2006.
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32494
Deposited By: Tony Diaz
Deposited On:17 Jul 2012 17:11
Last Modified:26 Dec 2012 15:34

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