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Effects of 2 Hz imposed bulk flow unsteadiness on laminar/turbulent transition in a straight channel.

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Author
Greco, Francis J.
Date
1989
Advisor
Ligrani, Phillip M.
Subramanian, Chelakara S.
Second Reader
Subramanian, Chelakara S.
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Abstract
Laminar turbulent transition is studied in a straight channel with 2 Hz imposed bulk flow unsteadiness for Reynolds umbers of 1 100 to 3800 and Strouhal numbers of 0.121 to 0.035. Channel aspect ratio is 40 to 1 with 1.27 cm height. 50.8 n width and 4.27 m length. Observations, videos, and photographs of smoke patterns show different subcritical transition 'ents including Tollmien-Schlichting waves, vortex-array type motion evidenced by smoke swirls, ribbon-like patterns, trbulentspots. and fully turbulent flow. Fluctuating intensity magnitudes relative to velocities from imposed unsteadiness e determined from phase-aveiaged velocity traces. With 2 Hz unsteadiness, transition events begin to occur at lower eynolds numbers and extend over a wider range of Reynolds numbers compared to flows with no imposed unsteadiness.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
URI
http://hdl.handle.net/10945/27013
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  • 1. Thesis and Dissertation Collection, all items

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    Effects of 1 Hz imposed bulk flow unsteadiness on laminar/turbulent transition in a straight channel 

    Coumes, Thomas M. (Monterey, California. Naval Postgraduate School, 1989-12);
    Laminar/turbulent transition is studied in a straight channel with 1 Hz imposed bulk flow unsteadiness for Reynolds numbers of 1103 to 2715 and Strouhal numbers of 0.06045 to 0.02455. Channel aspect ratio is 40 to 1 with ...
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    Flow visualization studies in (1) a curved rectangular channel with 40 to 1 aspect ratio and (2) a straight channel with imposed bulk flow unsteadiness. 

    Longest, Jerry Mark (Monterey, California. Naval Postgraduate School, 1989-06);
    Flow visualization results are presented which were obtained in a curved channel with mild curvature and 40 to 1 aspect ratio. Inside channel dimensions are 1.27 cm x 50.80 cm. For Dean numbers from 60 to 200 and angular ...
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    Compressibility Effects on Dynamic Stall of Oscillating Airfoils 

    Chandrasekhara, M.S.; Carr, L.W. (1995);
    A review of experimental results from an ongoing study of the effects of compressibility on dynamic stall of an oscillating NACA 0012 airfoil is presented. The study shows that compressibility effects become significant ...
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