(Aeronáutica) Artículos
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Examinando (Aeronáutica) Artículos por Materia "Aerodynamics"
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Publicación Restringido Aerodynamic investigation of a morphing wing for micro air vehicle by means of PIV(MDPI, 2020-10) Bardera, Rafael; Rodríguez Sevillano, A.; García Magariño, A.; Ministerio de Defensa; García Magariño, A. [0000-0002-6039-8407]A wind tunnel tests campaign has been conducted to investigate the aerodynamic flow around a wing morphing to be used in a micro air vehicle. Non-intrusive whole field measurements were obtained by using PIV, in order to compare the velocity and turbulence intensity maps for the modified and the original version of an adaptive wing designed to be used in a micro air vehicle. Four sections and six angles of attack have been tested. Due to the low aspect ratio of the wing and the low Reynold number tested of 6.4 × 104, the influence of the 3D effects has been proved to be important. At high angles of attack, the modified model prevented the detachment of the stream, increased the lift of the wing and reduced the turbulence intensity level on the upper surface of the airfoil and in the wake.Publicación Acceso Abierto Identification of kite aerodynamic characteristics using the estimation before modeling technique(Wiley Online Library, 2021-01-06) Borobia Moreno, R.; Ramiro Rebollo, D.; Schmehl, R.; Sánchez Arriaga, G.; Ministerio de Economía y Competitividad (MINECO); Agencia Estatal de Investigación (AEI); Borobia Moreno, R. [0000-0003-4435-5113]; Schmehl, R. [0000-0002-4112-841X]; Sánchez Arriaga, G. [0000-0002-8122-4051]The aerodynamic characteristics of a leading edge inflatable (LEI) kite and a rigid-framed delta (RFD) kite were investigated. Flight data were recorded by using an experimental setup that includes an inertial measurement unit, a GPS, a magnetometer, and a multi-hole Pitot tube onboard the kites, load cells at every tether, and a wind station that measures the velocity and heading angle of the wind. These data were used to feed a flight path reconstruction algorithm that estimated the full state vector of the kite. Since the latter includes the aerodynamic force and moment about the center of mass of the kite, quantitative information about the aerodynamic characteristics of the kites was obtained. Due to limitation of the experimental setup, the LEI kite flew most of the time in post-stall conditions, which resulted in a poor maneuverability and data acquisition. This assumption was corroborated by a particular maneuver where the lift coefficient decreased from 1 to 0.4, while its angle of attack increased from 35° to 50°. On the contrary, abundant flight data were obtained for the RFD kite during more than 10 figure-eight maneuvers. Although the angle of attack was high, between 20° and 40°, the kite did not reach its maximum lift coefficient. High tether tensions and a good maneuverability were achieved. Statistical analysis of the behavior of the lift, drag, and pitch moment coefficients as a function of the angle of attack and the sideslip angle allowed to identify some basic aerodynamic parameters of the kite.
