A major concern in the application of a laminar flow wing design to commercial transports is whether laminar flow can be sustained in the presence of the noise environment due to wing mounted turbofan engines. To investigate this issue, a flight test program was conducted using the Boeing 757 flight research airplane with a portion of the wing modified to obtain natural laminar flow. The flight test had two primary objectives. The first was to measure the noise levels on the upper and lower surface of the wing for a range of flight conditions. The second was to investigate the effect of engine noise on laminar boundary layer transition. The noise field on the wing and transition location on the glove were then measured as a function of the engine power setting at a given flight condition. The transition and noise measurement on the glove show that there is no apparent effect of engine noise on the upper surface transition location. On the lower surface, the transition location moved forward 2 to 3 percent chord. A boundary layer stability analysis to the flight data showed that cross flow disturbances were the dominant cause of transition at most flight conditions.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    757 NLF (Natural Laminar Flow) Glove Flight Test Results


    Contributors:

    Publication date :

    1987


    Size :

    24 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    F-111 TACT natural laminar flow glove flight results

    Montoya, L. C. / Steers, L. L. / Trujillo, B. | NTRS | 1981


    F-16XL Supersonic Laminar Flow Control Glove Flight Test Results

    Anderson, B. / Rowan, B. / AIAA | British Library Conference Proceedings | 1991


    Further Results of Natural Laminar Flow Flight Test Experiments

    Ahmed, A. / Nyenhuis, R. / Wentz, W. H. | SAE Technical Papers | 1985


    Flight tests with a natural laminar flow glove on a transport aircraft

    HORSTMANN, K. / REDEKER, G. / QUAST, A. et al. | AIAA | 1990


    The 757 NLF glove flight test results

    Runyan, L. Jim / Bielak, G. W. / Behbehani, R. A. et al. | NTRS | 1987