This research has demonstrated the high performance of the coflow jet airfoil concept in wind-tunnel tests. The CFJ (coflow jet) airfoils are shown to drastically increase lift, stall margin, and drag reduction. With the momentum coefficient varying from 0.1 to 0.30, the maximum lift of the smaller size CFJ airfoil is increased by 113 to 220%, and the angle of attack operating range (stall margin) is increased by 100 and 153%. The minimum drag coefficient is reduced by 30 to 127% with the momentum coefficient varying from 0.055 to 0.192. A negative drag (thrust) is produced when the momentum coefficient is high. In the experiment, it is observed that there is a limit of the jet mass flow rate in maintaining the stability of the flow. Below the limit, increasing the jet mass flow (momentum coefficient) will make the flow attached and increase the lift and stall AOA (angle of attack). However, if the jet mass flow rate exceeds the limit, the whole flowfield breaks down and a large separation occurs. It is speculated that the instability may be attributed to the large dissimilarity of the jet and the main flow, and the large centrifugal force of the jet when the jet velocity is high. The exact mechanism is not clear yet and will be studied in future research.


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    Titel :

    High-performance airfoil using coflow jet flow control


    Weitere Titelangaben:

    Hochleistungs-Tragfläche mit Coflow-Jet-Strömungskontrolle


    Beteiligte:
    Zha, Ge-Cheng (Autor:in) / Carroll, Bruce F. (Autor:in) / Paxton, Craig D. (Autor:in) / Conley, Clark A. (Autor:in) / Wells, Adam (Autor:in)

    Erschienen in:

    AIAA Journal (online) ; 45 , 8 ; 2087-2090


    Erscheinungsdatum :

    2007


    Format / Umfang :

    4 Seiten, 7 Bilder, 1 Tabelle, 11 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    High-Performance Airfoil Using Coflow Jet Flow Control

    Ge-Cheng Zha / Bruce Carroll / Craig Paxton et al. | AIAA | 2007



    Jet Effects on Coflow Jet Airfoil Performance

    Gecheng Zha / Wei Gao / Craig Paxton | AIAA | 2007