Vortices can develop in the intakes of turbojet and turbofan aero engines during high power operation near solid surfaces such as during takeoff or ground tests. These vortices can stall the compressor and cause significant damage. The factors determining the formation of the vortex include engine thrust, distance from ground, and ambient vorticity. A computational fluid dynamics study was conducted to determine whether these effects could be predicted numerically, and the results were compared to previous wind-tunnel studies. This is the first reported study of numerical predictions of the vortex formation threshold. Two factors, which had not been previously studied either experimentally or numerically, were investigated: the effects of increasing the size of the suction inlet and increasing the thickness of the ground boundary layer. Both were found to encourage vortex formation. The threshold of vortex formation predicted numerically agrees with previous wind-tunnel studies, within the scatter of the experimental data. The numerical results reproduce all trends identified in the experimental studies. The minimum shear required to form a vortex was found, lying between 0.001 and 0.05/s (Rossby number of the order of 105).


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    Titel :

    Location of the vortex formation threshold at suction inlets near ground planes by computational fluid dynamics simulation


    Beteiligte:
    Jermy, M (Autor:in) / Ho, W H (Autor:in)


    Erscheinungsdatum :

    2008-03-01


    Format / Umfang :

    10 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





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