An experimental study was performed in a water tunnel to evaluate the effects of continuous and pulsed blowing jets on the counter-rotating vortices generated by the afterbody of a slanted base cylinder. Drag reductions from continuous blowing through circular jets were found to vary significantly with direction and location, and approached 7% when blowing outboard from upstream locations on the upswept face. However, for all circular jets tested, the external power required was larger than the power saved due to the drag reduction. Jet vortices restricted shear layer development, leading to smaller afterbody vortex cores further from the surface. A high-aspect-ratio jet flap, ejecting nearly parallel to the freestream, achieved drag reductions close to 9%, equating to the net energy savings of almost 3% for the best case. Jet vortices shortened the shear layer, resulting in vortices with reduced circulation, which were displaced away from the upswept face. Pulsing the jet flap resulted in improved drag reductions and energy savings (up to around 6%) compared with the equivalent continuous blowing case at the same time-averaged jet momentum coefficient. Pulsed blowing caused an increase in vortex separation and meandering, whereas the circulation was reduced by up to 10% of that for continuous blowing.


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    Titel :

    Control of Upswept Afterbody Vortices Using Continuous and Pulsed Blowing


    Beteiligte:
    Jackson, Richard (Autor:in) / Wang, Zhijin (Autor:in) / Gursul, Ismet (Autor:in)

    Erschienen in:

    Journal of Aircraft ; 57 , 1 ; 76-92


    Erscheinungsdatum :

    2019-11-19


    Format / Umfang :

    17 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Control of Afterbody Vortices by Blowing

    Jackson, Richard W. / Wang, Zhijin / Gursul, Ismet | AIAA | 2015



    An experimental investigation of the flow field about an upswept afterbody

    Epstein, Ronald / Carbonaro, Mario / Caudron, F. | AIAA | 1994


    Control of Afterbody Vortices by Blowing (AIAA 2015-2777)

    Jackson, Richard W. / Wang, Zhijin / Gursul, Ismet | British Library Conference Proceedings | 2015