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COBEM 2017
24th ABCM International Congress of Mechanical Engineering
PRELIMINARY DESIGN OF A DEVICE TO PERFORM ROLL CYCLE LIMIT OSCILLATIONS AND WING ROCK PHENOMENON IN LOW-SUBSONIC WIND TUNNEL
Submission Author:
Hermann Luis Lebkuchen , SP
Co-Authors:
ROBERTO GIL ANNES DA SILVA, Hermann Luis Lebkuchen
Presenter: Hermann Luis Lebkuchen
doi://10.26678/ABCM.COBEM2017.COB17-1467
Abstract
The self induced roll oscillations are encountered when slender delta wings flight at high angles of attack. These oscillations are investigated as limit cycle oscillations in numerical analysis of dynamic problems. One particular flight mechanics phenomenon in slender delta wings with high sweep angle is the wing rock. This paper presents the preliminary design of an apparatus to experimentally investigate the induced roll oscillations produced by the wing rock. The apparatus requirements as well as the wind tunnel test section and its neighborhood limitations are considered on the search of the most feasible solution. In order to accomplish that, a morphologic matrix of possible solutions is developed considering forced and free experiment cases. The roll mechanism, as well as the data acquisition systems are proposed for both free and forced experiments. As a result, the best alternatives are chosen and justified, and a final preliminary model is proposed to be manufactured and tested in the low speed subsonic wind tunnel at the Brazilian Institute of Aeronautics and Space.
Keywords
wing rock, experimental aerodynamics, low subsonic wind tunnel, cycle limit oscillation, Flight Mechanics
