Design and Experimental Investigation of a Wind Tunnel Gust Generator

Yığılı, İmge
In the design, certification and operation cycles of air vehicles, wind turbines, etc., it is critically important to quantitatively demonstrate the capability of the vehicle to withstand any environmental and meteorological condition. Of several atmospheric conditions, one very common and significant one is the atmospheric gust. Therefore, capacity to generate gust in a fully controlled manner is of utmost importance. In wind tunnels, gust generation is done by means of gust generators, which are devices positioned upstream of the wind tunnel test sections to produce gusts of desired profiles and magnitudes. In this context, the focus of this thesis is the design and manufacturing of a double vane gust generator and investigation of the changes in the flow field with different actuation parameters and distance between the gust vanes. One novel contribution of this study to existing work is that full field information is obtained by using Particle Image Velocimetry technique instead of using pointwise measurement techniques such as hot wire anemometry. Spatial and temporal behavior of the gust flow for various actuation parameters and vane spacing values are explored and presented in this thesis. Experimental results are compared to numerical results and computational investigation of the gust generator is also shown. Finally, as an application, a porous disk and a model wind turbine that have the same thrust coefficient are positioned downstream of the gust generator. Wake flows of the two models are then compared under a transverse gust loading and the capacity of the porous disk in mimicking the wind turbine wake under a gusty inflow condition is tested. Outcomes of this study will serve as a starting point for a gust generator which will be placed in the Large Scale Wind Tunnel of METU Center for Wind Energy Research (RÜZGEM).


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Andırın, Mert Ali; Uzol, Oğuz; Perçin, Mustafa; Department of Aerospace Engineering (2022-6-16)
Wind tunnels are designed to operate at low turbulence intensities, which makes it unfeasible to study the turbulent and gusty flows that are observed in nature and in engineering applications. To conduct such studies number of unconventional methods are adopted in wind tunnels, one of which is the use of active grids. Active grids consist of motor-driven rods which accommodate flaps and they are generally placed at the inlet of wind tunnel test sections. By regulating the motion of the agitator wings, flow...
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Design and Experimental Investigation of a Wind Tunnel Gust Generator
Yığılı, İmge; Andırın, Mert Ali; Kurban, Erk; Başkan Perçin, Özge; Perçin, Mustafa (2021-09-10)
This work aims at developing a two-vane gust generator for a small size open-loop wind tunnel to study the unsteady aerodynamic response of lift producing test models. The focus of the study is two-fold: (1) the design of a gust generator which produces the desired gust profiles by varying the parameters such as flow speed, pitching frequency of the vanes, maximum angle of deflection of the vanes and spacing between the vanes and (2) the experimental investigation of the gust velocity profiles via particle ...
Citation Formats
İ. Yığılı, “Design and Experimental Investigation of a Wind Tunnel Gust Generator,” M.S. - Master of Science, Middle East Technical University, 2022.