Experimental Investigation of Vortex Structures in Wake of Hyperboloid-Shaped Model by Means of 2D Particle Image Velocimetry Measurement

Experimental Investigation of Vortex Structures in Wake of Hyperboloid-Shaped Model by Means of 2D Particle Image Velocimetry Measurement

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This paper deals with flow around a bluff body of hyperboloid shape.It consists of results gathered in the course of research by means of Particle Image Velocimetry (PIV).The experiments were carried out by means of low-frequency 2D PIV in a range of Reynolds numbers from 40000 to 50000.

A hyperboloid-shaped model was measured in a wind tunnel with a modelled atmospheric boundary layer (and Car Screen Protectors additionally, in a low-speed wind tunnel with low turbulence).The model was tested in a subcritical range of Reynolds numbers and various planes in a wake of the model were captured with the intention of getting an estimation of 3D flow structures.The tunnel with the modelled atmospheric boundary layer has a high rate of turbulence, so the influence of the turbulence of incoming flow on the wake could be outlined.

The ratio of the height of the model to a thickness of the modelled boundary layer in the tunnel was 1/3, meaning the turbulence in the boundary layer strongly influenced the flow around the model; it suppresses the wake which leads to a lot shorter area of recirculation Lice than low turbulence incoming flow would cause.