Future high-performance aircraft will be designed as an integrated system of 'smart components' with massive, distributed active-flow-control units. Here, the smart components are referred to as elements of an aircraft system with adaptive logic capability. These components will then perform 'optimally' under the most severe flight conditions. A few examples seem in order at this point. A delta wing at high angle of attack or yaw which can dictate its vortex burst locations; a subsonic diffuser which actively controls flow separation and engine-face distortion levels in a maneuvering aircraft; a compressor equipped with an active surge control unit; a propulsion installation in a multi-engined aircraft which can minimize its boattail and base drag in subsonic, transonic, and supersonic flight corridors; and active control of three-dimensional separation on bodies of revolution in yaw represent just a few applications of adaptive logic philosophy. To realize the aforementioned advances in a practical operating unit, one must establish the following: (1) distributed flow sensors at 'critical' locations; (2) a central processing unit with data link to A/C flight computer; (3) 'suitable' active flow manipulators: e.g., type, frequency response, amplitude; and (4) a self-optimizing, closed-loop (feedback) control of the active flow devices. This is a formidable and challenging task with tremendous payoffs for aeronautics as well as spin-off applications to land and sea vehicles. Active flow control units integrated into cars and trucks will reduce vehicle drag and enhance stability at highway speeds. Similarly, submarines will be able to maneuver with enhanced stability, quietly, and with minimum propulsive requirements.


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    Title :

    Active Flow Control for Twenty-First Century High-Performance Aircraft with Applications to Land and Sea Vehicles


    Contributors:
    S. Farokhi (author)

    Publication date :

    1992


    Size :

    1 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English