AFC (Active Flow Control) techniques have been computationally examined for a diverse set of practical aerodynamic problems. Flow control modes based on intermittent jet pulsation and on sprinkler jet motion were employed. Pulsed-jet actuation is used to model either zero-massflux devices or actuators that require fluidic sources (i.e., engine bleed). AFC for high-lift systems can potentially lead to performance enhancement over the practical range of angles of attack. Substantial lift increment can be realized by exploiting synergistic effects using actuation at individual wing elements. Depending on the flow conditions, the full benefit of nonlinear augmentation is realized when the actuation is simultaneously applied at select ports, producing lift levels approaching the inviscid limit. This has very important ramifications, since there are high payoffs for vehicles that can operate from very short fields, from both economical and operational standpoints. In the engine vortex problem associated with ground operation, the pulsed jets and the sprinkler systems have resulted in the reduction of vortex ingestion and its concomitants, the risks of FOD (Foreign Object Damage) and engine surge. Wide-area coverage of actuation is a key attribute that makes the sprinkler system especially attractive for control of unsteady vortices. The sprinkler jet has also been used for control of trailing wakes, whereby flow actuation introduces time-varying perturbations into wing vortex elements to hasten vortex breakup. Depending upon the frequency of actuation, this actuation effectively disrupts the wake flow by either accelerating vortex decay or by encouraging instabilities along the vortex element. This effectively renders milder wakes and more benign conditions for following airplanes. High-frequency actuation results in significantly lower blade-to-blade vortex interactions in rotorcraft applications, with implications to reduced noise. Although the set of results from numerical simulations are very encouraging, we recognize that practical implementations of the flow control concepts require thorough system integration analyses. The range of optional implementations offered by AFC implies that a pragmatic approach to a practical design that encompasses other disciplines such as structures, noise, and power systems is indispensable.


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    Title :

    Flow control techniques for transport aircraft


    Additional title:

    Durchflussregelungsverfahren für Transportflugzeuge


    Contributors:

    Published in:

    AIAA Journal ; 49 , 3 ; 489-502


    Publication date :

    2011


    Size :

    14 Seiten, 23 Bilder, 28 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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