Experimental investigation of a jet impinging on a ground plane in the presence of a cross flow

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

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Citation (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 vertical or short takeoff and landing (V/STOL) aircraft. A constant jet velocity was maintained while varying the wind tunnel cross flow velocity, upstream boundary layer thickness, and height from the ground to the jet exit plane. The radial wall jet, when interacting with the cross flow, 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 flow field above the ground plane and two-component laser Doppler velocimeter measurements taken through the separation bubble indicate that the separation bubble is highly unsteady and non-symmetric. This unsteadiness may be related to shear layer vortices shed from the lip of the jet.

    Original languageEnglish (US)
    Title of host publicationSAE Technical Papers
    DOIs
    StatePublished - Dec 1 1987

    Fingerprint

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

    All Science Journal Classification (ASJC) codes

    • Automotive Engineering
    • Safety, Risk, Reliability and Quality
    • Pollution
    • Industrial and Manufacturing Engineering

    Cite this

    Cimbala, J. M., Stinebring, D. R., Treaster, A. L., Billet, M. L., & Walters, M. M. (1987). Experimental investigation of a jet impinging on a ground plane in the presence of a cross flow. In SAE Technical Papers https://doi.org/10.4271/872326
    Cimbala, John Michael ; Stinebring, D. R. ; Treaster, A. L. ; Billet, M. L. ; Walters, M. M. / Experimental investigation of a jet impinging on a ground plane in the presence of a cross flow. SAE Technical Papers. 1987.
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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 vertical or short takeoff and landing (V/STOL) aircraft. A constant jet velocity was maintained while varying the wind tunnel cross flow velocity, upstream boundary layer thickness, and height from the ground to the jet exit plane. The radial wall jet, when interacting with the cross flow, 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 flow field above the ground plane and two-component laser Doppler velocimeter measurements taken through the separation bubble indicate that the separation bubble is highly unsteady and non-symmetric. This unsteadiness may be related to shear layer vortices shed from the lip of the jet.",
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    Experimental investigation of a jet impinging on a ground plane in the presence of a cross flow. / Cimbala, John Michael; Stinebring, D. R.; Treaster, A. L.; Billet, M. L.; Walters, M. M.

    SAE Technical Papers. 1987.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

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