In many commercially proposed flight test implementations of hybrid laminar flow control, multiple suction panels are used, a typical example being the Airbus A320 hybrid laminar flow fin. This paper addresses the problem of determining the optimal suction distribution on such a multiple-panel system so as to minimize overall energy consumption. To determine the optimal transition position for the boundary layer, it is necessary to be sure that the minimum amount of energy is being spent on suction at every trial transition point. Furthermore, there may be overriding aerodynamic considerations (such as the necessity of avoiding separation) that constrain the transition point. In either case, there is a necessity for a procedure to determine the optimal suction distribution that maintains a given transition position for the minimum expenditure of suction pump energy. A preliminary investigation of this problem was given in a previous paper (Nelson, P.A., Wright, M.C.M., and Rioual, J.-l., 'Automatic Control of Boundary-llayer Transition,' AIAA Journal, Vol. 35, No. 1, 1997, pp. 85-90) for the case of a wind-tunnel model with two independent suction panels. Further developments of a system for smart suction management for hybrid laminar flow aircraft are presented, wherein the energy saved by reducing drag must be balanced against the energy expended in providing the suction. Experimental results are presented, whereby the streamwise distribution of suction velocity over a flat plate in a wind tunnel is automatically adjusted so that the laminar-turbulent transition point, which is detected by an array of surface-mounted microphones, is maintained at a desired point and the suction pump energy required to keep it at that point is minimized.


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    Title :

    Four-channel suction distribution optimization experiments for laminar flow control


    Additional title:

    Minimierung des Energieverbrauchs beim Absaugen einer laminaren Grenzschicht bei vorgegebenem Turbulenzeinsatzpunkt


    Contributors:

    Published in:

    AIAA Journal ; 38 , 1 ; 39-43


    Publication date :

    2000


    Size :

    5 Seiten, 6 Bilder, 14 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English






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