Paper describes perforated and nonperforated riblet tests on the fuselage of a modified Learjet Model 28/29 twin-engine business jet at Reynolds numbers 1.0-2.75 x 10 to the 6th/ft and Mach numbers 0.3-0.7. Drag reductions of the order of 6 percent at nondimensional wall spacings of 12 were obtained using boundary-layer rakes and direct drag balances. At the measurement locations the Reynolds number based on distance was 1.0-46 x 10 to the 6th. The nondimensional wall spacing for maximum drag reduction was well-predicted by low-speed wind-tunnel data, but the maximum drag reduction was lower. The low drag is tentatively ascribed to various instrumentation difficulties and the flow field on the aircraft. Riblets with 0.010-in. perforations at center spacings of 0.25 in. were found to give the same drag reduction as nonperforated riblets.


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    Title :

    Riblet drag reduction at flight conditions



    Conference:

    AIAA Applied Aerodynamics Conference ; 1988 ; Williamsburg, VA, United States


    Publication date :

    1988-01-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English


    Keywords :


    Riblet drag reduction at flight conditions

    WALSH, MICHAEL / SELLERS, III, WILLIAM / MCGINLEY, CATHERINE | AIAA | 1988


    Riblet drag at flight conditions

    Walsh, Michael J. / Sellers, William L., III / Mcginley, Catherine B. | NTRS | 1989


    Riblet drag at flight conditions

    WALSH, MICHAEL J. / SELLERS, WILLIAM L. / MCGINLEY, CATHERINE B. | AIAA | 1989