Experimental Investigation of 3d Vortex Structures in Wake of Hyperboloid-Shaped Model

Abstract

The model of a hyperboloid shaped object was measured by means of 2D Particle Image Velocimetry in the Wind Tunnel with simulated atmospheric boundary layer. The model was tested in a subcritical range of Reynolds number. Various planes in a wake of the model were captured. One was set in the model axis and perpendicular to the ground and the averaged velocity field of this measurement revealed a possible arch vortex behind the model. Next, several planes perpendicular to the ground were measured. The averaged velocity field showed two symmetrical formations. From these measurements, the shape of the arch vortex was estimated.

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

“…Some of the results were already presented in [1] and [2]. For this paper, special attention was paid to the measurement in the wake.…”

“…It was explained in [1] and [2], that the model of the cooling tower later started to be called a hyperboloidshaped model because an original civil-engineering problem solved in a classical way (wind loadings on cooling towers were measured and evaluated) later turned into a pure mechanics of fluids problem. After all the pressures on the model had been measured, Particle Image Velocimetry got involved and the velocity fields around the model were caught.…”

Compilation of Vortex Filament of Arch Vortex in Wake of Cooling Tower Model

“…It was already explained, that the picture of the flow around the hyperboloid-shaped model is being hunted. This contribution focuses on compilation of vortex filament of the arch vortex, most probable structure caught in past by PIV measurement and introduced in [2]. For this purpose, sixteen planes parallel to the surface were measured by PIV, which covered sufficiently the vertical part of the filament [ Fig.…”

“…Results were already presented in a few papers (Eg. [1] and [2]). This contribution goes into more detail.…”

“…This contribution goes into more detail. An arch vortex appeared in pictures presented in [2]. Therefore for this paper a more detailed measurement was done, in a wake of the model, in order to get the coordinates of an arch vortex filament.…”