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M. Endres, H. Sommerwerk, C. Mendig, M. Sinapius, P. Horst
Two mechanical de-icing systems are presented which are applied to a test specimen consisting of a wing section with a NACA0012 profile. The test specimen is of modular design to be able to substitute the leading edge section for investigating the different de-icing and ice detection systems. The de-icing tests are performed in the icing wind tunnel of the Institute of Fluid Mechanics of the TU Braunschweig. The first de-icing concept is a mechanical system based on structural vibrations of the unstiffened sections. Due to a suitable actuator and its position the skin is excited at its natural frequency. The applied actuators are piezoelectric patch actuators based on the d31-effect, which are placed at the inner side of the leading edge. The second system under investigation is the Electro Impulse De-Icing concept. Coils placed underneath the upper and lower aluminium skin are supplied with short high current impulses which produce opposing time-dependent magnetic fields around coil and skin. The resulting magnetic forces repel the structure which leads to a damped oscillation of the skin. The first aim of this work is to investigate the performance of the two mechanical de-icing systems under various icing conditions. Operational parameters like temperature and liquid water content are varied in order to attain different ice shapes, ice thicknesses and types of ice (glaze and rime ice). The test results show that the de-icing performance of both systems mainly depends on the ice layer thickness and the environmental temperature. The second aim of this work is to investigate the de-icing mechanism of the ice accumulated on the mechanical de-icing systems. Therefore, the de-icing procedure is recorded with a high speed camera. The efficiency of both de-icing systems can be increased significantly on a full-scale airfoil, if the ice-covered areas are known. Thus, it is indispensable to have a reliable ice detection system to control the presented de-icing system appropriately.
Deutscher Luft- und Raumfahrtkongress 2016, Braunschweig
Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2016
21,0 x 29,7 cm, 9 Seiten
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