Experimental investigation of a jet impinging on a ground plane in crossflow

John Michael Cimbala, D. R. Stinebring, A. L. Treaster, M. L. Billet, M. Walters

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    An experimental investigation has been conducted in a wind tunnel to model the impingement of high-velocity jet exhaust flow on the ground, as encountered by V/STOL aircraft. A constant jet velocity was maintained while varying the wind tunnel crossflow velocity, upstream boundary-layer thickness, and height from the ground to the jet exit plane. The radial wall jet, when interacting with the crossflow, forms an oscillating horseshoe-shaped separation bubble, commonly referred to in the literature as a ground vortex. The streamwise distance of the separation point from the jet impingement point is documented here as a function of the flow parameters and geometry. Flow visualization of the flowfield and two-component laser Doppler velocimeter measurements taken through the separation bubble indicate that the separation bubble is highly unsteady and nonsymmetric. This unsteadiness may be related to shear-layer vortices shed from the lip of the jet. Thickening of the upstream boundary layer on the ground plane caused the wall jet to penetrate further upstream. The addition of a large plate flush-mounted to the jet exit caused the ground vortex to move downstream and also decreased the size of the ground vortex.

    Original languageEnglish (US)
    Pages (from-to)923-931
    Number of pages9
    JournalJournal of Aircraft
    Volume25
    Issue number10
    DOIs
    StatePublished - Jan 1 1988

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    Vortex flow
    Wind tunnels
    Boundary layers
    VTOL/STOL aircraft
    Laser Doppler velocimeters
    Flow visualization
    Geometry

    All Science Journal Classification (ASJC) codes

    • Aerospace Engineering

    Cite this

    Cimbala, J. M., Stinebring, D. R., Treaster, A. L., Billet, M. L., & Walters, M. (1988). Experimental investigation of a jet impinging on a ground plane in crossflow. Journal of Aircraft, 25(10), 923-931. https://doi.org/10.2514/3.45681
    Cimbala, John Michael ; Stinebring, D. R. ; Treaster, A. L. ; Billet, M. L. ; Walters, M. / Experimental investigation of a jet impinging on a ground plane in crossflow. In: Journal of Aircraft. 1988 ; Vol. 25, No. 10. pp. 923-931.
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    abstract = "An experimental investigation has been conducted in a wind tunnel to model the impingement of high-velocity jet exhaust flow on the ground, as encountered by V/STOL aircraft. A constant jet velocity was maintained while varying the wind tunnel crossflow velocity, upstream boundary-layer thickness, and height from the ground to the jet exit plane. The radial wall jet, when interacting with the crossflow, forms an oscillating horseshoe-shaped separation bubble, commonly referred to in the literature as a ground vortex. The streamwise distance of the separation point from the jet impingement point is documented here as a function of the flow parameters and geometry. Flow visualization of the flowfield and two-component laser Doppler velocimeter measurements taken through the separation bubble indicate that the separation bubble is highly unsteady and nonsymmetric. This unsteadiness may be related to shear-layer vortices shed from the lip of the jet. Thickening of the upstream boundary layer on the ground plane caused the wall jet to penetrate further upstream. The addition of a large plate flush-mounted to the jet exit caused the ground vortex to move downstream and also decreased the size of the ground vortex.",
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    Cimbala, JM, Stinebring, DR, Treaster, AL, Billet, ML & Walters, M 1988, 'Experimental investigation of a jet impinging on a ground plane in crossflow', Journal of Aircraft, vol. 25, no. 10, pp. 923-931. https://doi.org/10.2514/3.45681

    Experimental investigation of a jet impinging on a ground plane in crossflow. / Cimbala, John Michael; Stinebring, D. R.; Treaster, A. L.; Billet, M. L.; Walters, M.

    In: Journal of Aircraft, Vol. 25, No. 10, 01.01.1988, p. 923-931.

    Research output: Contribution to journalArticle

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