Design and Experimental Investigation of a Wind Tunnel Gust Generator

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ImgeYigili_Thesis.pdf

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2022-9-01

Author

Yığılı, İmge

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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).

Subject Keywords

Gust Generation, Wind Tunnel, Particle Image Velocimetry, Sağanak Akış Üreteci, Rüzgar Tüneli, Parçacık Görüntülemeli Hız Ölçme

URI

https://hdl.handle.net/11511/99413

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

İ. Yığılı, “Design and Experimental Investigation of a Wind Tunnel Gust Generator,” M.S. - Master of Science, Middle East Technical University, 2022.