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K. Stadlberger, M. Hornung
The present study contains a brief literature review that covers integral methods combined with potential theory as well as computational fluid dynamics mainly represented by RANS approaches. Own research efforts comprise the implementation of a Matlab tool whose environment provides an incompressible 2D RANS solver including Menter's k-w-SST-model and Hellsten's stream line curvature correction. After a short description of the tool's main features the flow problem and its setup is specified and builds the basis of the performed numerical studies on lift generation. Comparing calculations with jet outflow through the upper slot confirm many of the uncertainties and difficulties found in literature when the RANS method is applied to model the diffusion-driven Coand¢a jet problem. While at low blowing rates the lift increments through trailing edge blowing agree sufficiently well for preliminary design purposes the results show significant difference for high blowing rates in the super-circulation region. A sudden rise in lift generation due to delayed jet detachment up to complete jet wrap around confirmed an instability in the RANS modelling method. Further numerical studies for dual-slot-blowing operation give hope for the applicability of this flow control concept for a flapless flight control effector system.
Deutscher Luft- und Raumfahrtkongress 2014, Augsburg
Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2015
21,0 x 29,7 cm, 13 Seiten
Stichworte zum Inhalt:
circulation control, modelling