Design and Experimental Investigation of a Wind Tunnel Gust Generator

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 image velocimetry (PIV). Preliminary results of the numerical simulations reveal that a sinusoidally pitching vane design with NACA0015 profile is capable of generating a gust ratio of 0.15. The outcomes of this study will serve as a starting point for the design of a gust generator which will be placed in the Large Scale Wind Tunnel of METU Center for Wind Energy Research (RUZGEM).
11th Ankara International Aerospace Conference


Experimental investigation of the effects of tip-injection on the aerodynamic loads and wake characteristics of a model horizontal axis wind turbine rotor
Abdulrahim, Anas; Uzol, Oğuz; Department of Aerospace Engineering (2014)
In this study, tip injection is implemented on a model Horizontal Axis Wind Turbine (HAWT) rotor to investigate the power and thrust coefficient variations as well as the wake characteristics. The model wind turbine has a 0.95 m diameter 3-bladed rotor with non-linearly twisted and tapered blades that has NREL S826 profile. The nacelle, hub and the blades are specifically designed to allow pressurized air to pass through and get injected from the tips while the rotor is rotating. The experiments are perform...
Genetic Algorithm based aerodynamic shape optimization tool for wind turbine blades and its implementation to helicopter blades
Polat, Özge; Sezer-uzol, Nilay; Tuncer, İsmail Hakkı (2014-01-01)
This study presents a methodology first built up for the aerodynamic shape optimization for wind turbine rotors and its modified version for a helicopter rotor in hover. The Genetic Algorithm (GA) coupled with an in-house Blade Element Momentum (BEM) tool is used in the design optimization process. The wind turbine blade optimization studies are performed for maximizing the power production at a given wind speed, rotor speed and rotor diameter, while for the helicopter blade optimization in hover, figure of...
Modeling and experimental identification of quadrotor aerodynamics
Kaya, D. Derya; Kutay, Ali Türker; Department of Aerospace Engineering (2014)
The aim of this study is to obtain mathematical models for aerodynamic forces and moments of rotors of a quadrotor helicopter, and estimate their parameters through wind tunnel tests for hover, vertical climb, and forward flight conditions. The main factors which determine the movement of a quadrotor UAV are the aerodynamic forces and moments in three axes created by four rotors of the vehicle. Hence, accurate calculation of rotor forces and moments in varying flight conditions are essential to establish a ...
Flow separation control of an elliptical wing by pulsating jet
Sohn, Myong H.; Chung, Hyoung S.; Tuncer, İsmail Hakkı (2005-01-01)
A flow control actuator utilizing steady/pulsating jet of pressurized air was designed and installed in a wind tunnel testing model of elliptic cylinder wing. To test its effectiveness and feasibility for flow separation control, an experimental study was conducted in a subsonic wind tunnel through surface pressure measurements, PIV measurements and flow visualization. The most effective jet slot position was found to be +45° from the chord line toward the upper wing with surface pressure measurements and v...
Experimental design and statistical modeling for efficient wind tunnel testing
Savaş, Özgün; Kutay, Ali Türker; Department of Aerospace Engineering (2019)
Wind tunnel testing is an essential procedure to measure the aerodynamic forces and moments on an air vehicle. In this thesis, a method is presented to perform such test in an efficient way. First, an experimental design process is carried out before the testing in order to cover the flight regime as fine as possible with the least possible number of tests. After the determination of the test matrix and conducting the wind-on tests, the modeling of the output data is the next step. On that matter, since the...
Citation Formats
İ. Yığılı, M. A. Andırın, E. Kurban, Ö. Başkan Perçin, and M. Perçin, “Design and Experimental Investigation of a Wind Tunnel Gust Generator,” presented at the 11th Ankara International Aerospace Conference, Ankara, Türkiye, 2021, Accessed: 00, 2022. [Online]. Available: