THE EFFECT OF RIBLETS ON LAMINAR TO TURBULENT TRANSITION

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作者
LADD, DM
ROHR, JJ
REIDY, LW
HENDRICKS, EW
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TH [机械、仪表工业];
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0802 ;
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Experiments conducted on the effect of riblets on the laminar-to-turbulent transition of a flat plate in a water tunnel are reported. Transition was determined using a Laser Doppler Velocimeter (LDV). A smooth reference surface was compared to five riblet surfaces for a range of Reynolds numbers. Smooth surface transition Reynolds number was about 2.75 x 10(6). All of the five tested riblet surfaces had lower transition Reynolds numbers. A critical roughness Reynolds number of about 6 was determined for one of the riblet surfaces. This is much lower than the generally accepted value of 25, considered safe for distributed roughness.
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页数:9
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