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International Journal of Aerodynamics (2 papers in press)
Computational modeling of elongated body aerodynamics at variable pitch angles in postcritical flow condition by Konstantin Matveev, Miles Wheeler Abstract: Special types of unmanned aerial vehicles are intended to fall unpowered through the air during the initial descent upon release from another aircraft. To predict dynamics of these vehicles in such high-speed falls and later develop means for steering, their aerodynamic characteristics need to be understood. In this work, a cylindrical body is simulated in steady translation through the air in postcritical flow regimes. Validation studies carried out for cylinders with known aerodynamic properties suggested the usage of Detached Eddy Simulation approach with SST k-omega; turbulence model and gamma-transition model. The force and moment coefficients are determined for a rounded-edge cylinder in a range of pitch angles. The drag coefficient initially increases with the pitch angle, but at higher angles the drag variation becomes smaller. The side force demonstrates a well-defined maximum at a medium pitch angle. The aerodynamic moment for inclined body positions tend to force the body into the transverse orientation with respect to the incident flow. Keywords: aerodynamics; unmanned aerial vehicles; CFD.
Speed Deficit Determination in the Wake of a Darrieus-Troposkien Turbine. by Jorge Lassig, Carlos Labriola Abstract: A series of tests on small Darrieus Troposkien Turbine (DTT) was performed in a wind tunnel, to determine the speed deficit and turbulence intensity that adds the wake. These tests are made in order to provide information on the interaction that could result on an array of this type of wind turbines, installed on the roof of a building. The tested turbine had and equatorial diameter of 0.85m and a high of 1.30m. It has with two blades of symmetrical profile NACA 0024. The decrease of rotor speed was 10% with wind speed from 9 m/s to 13 m/s. The turbulence intensity added by the turbine in the wake measured at a distance of one diameter was 0.27, and 0.17 measured at two diameters. Keywords: Darrieus; Wake; Speed Deficit; Turbulence intensity.