Particle image velocimetry data are presented from a scaled jet-lift aircraft ground vortex compressible flow. The scaled ground vortex is generated by a vertical compressible jet in cross-flow impinging on a moving ground plane. Particle image velocimetry is used to generate both transient and time-averaged flow statistics from the ground vortex region over a range of nozzle pressure ratios from 2.3 to 3.7, nozzle height-to-diameter ratios (h/dn) from 3 to 10 (where dn = 12.7 mm) and cross-flow velocities (V∞) from 10 to 20 m/s. These conditions correspond to effective (jet-to-cross flow) velocity ratios of 15 < Ve-1 < 60. For each condition, mean and root mean square ground vortex core position was analysed from sets of 11 instantaneous particle image velocimetry vector maps. Over the range of effective velocity ratios, VVe-1, the particle image velocimetry results showed that the ground vortex mean streamwise position varied from 5dn to 16dn and the root mean square fluctuation in this position varied from 0.7dn to 1.5dn. Further analysis of the ground vortex temporal characteristics did not reveal any dominant non-dimensional frequencies.


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    Title :

    Transient and time-averaged characteristics of a compressible ground vortex flow


    Additional title:

    Transiente und zeitgemittelte Charakteristika einer kompressiblen bodennahen Wirbelströmung


    Contributors:
    Lawson, N.J. (author) / Knowlws, K. (author) / Bray, D. (author) / Finnis, M.V. (author) / Eyles, J.M. (author)


    Publication date :

    2014


    Size :

    9 Seiten, 8 Bilder, 17 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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