Influence of an unfavourable pressure gradient on the breakdown of boundary layer streaks |
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Authors: | Chernoray V G Kozlov V V I Lee Chun H H |
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Institution: | (1) Department of Mechanical Engineering, Technische Universiteit Eindhoven, P.O. Box 513, Eindhoven, 5600, The Netherlands |
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Abstract: | Breakdown of boundary layer streaks is studied experimentally and compared at zero and adverse (positive) streamwise pressure
gradients on a wing under fully controlled experimental conditions. The varicose mode of streak breakdown is found to be a
dominant mode in the case of the adverse pressure gradient. A strong influence of pressure gradient upon the development of
the streak and the secondary instability is revealed. The unfavourable pressure gradient is shown to alter the critical streak
amplitude, the dispersion properties of the streak and the secondary disturbance, as well as attained maximum amplitudes for
both the streak and the secondary disturbance. |
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Keywords: | |
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