Experiments on the unsteadiness associated with a ground vortex

John Michael Cimbala, M. L. Billet, D. P. Gaublomme, J. C. Oefelein

    Research output: Contribution to journalArticle

    34 Citations (Scopus)

    Abstract

    The ground vortex formed by a jet impinging on the ground in the presence of a crossflow has been studied experimentally. High speed motion pictures and spectral measurements were obtained to study the unsteady features of this flowfield. A very low-frequency pulsation or "puffing" instability was observed. Since this unsteadiness could not be correlated with any other oscillations in the flowfield, the low-frequency oscillations must come from the gross features of the ground vortex itself. Namely, jet fluid accumulates in the ground vortex until the vortex is so large that the flowfield breaks up, the ground vortex is swept away, a new smaller vortex forms, and the process repeats itself. Measurements of the frequency of these oscillations are presented for the first time, and data on the vertical extent (height) of the ground vortex are also shown.

    Original languageEnglish (US)
    Pages (from-to)261-267
    Number of pages7
    JournalJournal of Aircraft
    Volume28
    Issue number4
    DOIs
    StatePublished - Jan 1 1991

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    Vortex flow
    Experiments
    Motion pictures
    Fluids

    All Science Journal Classification (ASJC) codes

    • Aerospace Engineering

    Cite this

    Cimbala, John Michael ; Billet, M. L. ; Gaublomme, D. P. ; Oefelein, J. C. / Experiments on the unsteadiness associated with a ground vortex. In: Journal of Aircraft. 1991 ; Vol. 28, No. 4. pp. 261-267.
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    Cimbala, JM, Billet, ML, Gaublomme, DP & Oefelein, JC 1991, 'Experiments on the unsteadiness associated with a ground vortex', Journal of Aircraft, vol. 28, no. 4, pp. 261-267. https://doi.org/10.2514/3.46021

    Experiments on the unsteadiness associated with a ground vortex. / Cimbala, John Michael; Billet, M. L.; Gaublomme, D. P.; Oefelein, J. C.

    In: Journal of Aircraft, Vol. 28, No. 4, 01.01.1991, p. 261-267.

    Research output: Contribution to journalArticle

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