Mean velocity and turbulence measurements were conducted on the three-dimensional fountain flow-field generated by the impingement of two axisymmetric jets on a ground plane with application to vertical-take-off and landing (VTOL) aircraft. The basic instantaneous velocity data were obtained using a two-component laser Doppler velocimeter in a plane connecting the nozzle centerlines at different heights above the ground emphasizing the jet impingement region and the fountain upwash region formed by the collision of the wall jets. The distributions of mean velocity components and turbulence quantities, including the turbulence intensity and the Reynolds shear stress, were derived from the basic velocity data. Detailed studies of the characteristics of the fountain revealed self-similarity in the mean velocity and turbulence profiles across the fountain. The spread and mean velocity decay characteristics of the fountain were established. Turbulence intensities of the order of 50 % were observed in the fountain.


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    Title :

    Laser doppler velocimeter measuements in a 3-D impinging twin-jet fountain flow


    Additional title:

    Messungen mit einem Laser-Doppler-Geschwindigkeitsmesser in einem dreidimensionalen Stroemungsfeld eines Duesenstrahls


    Contributors:

    Published in:

    Publication date :

    1984


    Size :

    13 Seiten, 18 Bilder, 18 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





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