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The trailing-edge flow and wake-vortex system are numerically investigated on a generic transport-aircraft configuration, the Common Research Model (CRM). The analysis is performed for cruise condition with a Mach number of Ma = 0:85, a Reynolds number of Re = 5 x 10^6 and an angle of attack of [alpha] = 2°. A time-accurate Reynolds-Averaged Navier-Stokes simulation applying the Menter-SST model is performed, which also allows for the representation of the starting vortex at the wing. The trailing-edge compatibility condition, derived with certain restrictions (e.g. Re ->[infinity]) is evaluated for the Common Research Model. The trailing-edge compatibility condition gives a relation between the flow velocity profiles in the vortex layer near the wing trailing edge and the bound circulation along the wing. Although effects at the wing are present for the investigated case, which are not considered by the trailing-edge compatibility condition, the circulation distribution along the wing is predicted very well. Furthermore, the wake-vortex system is investigated with focus on the circulation of the wake. The absolute value of the overall circulation in the wake and ist conservation in downstream direction are appropriately predicted. The roll-up process of the vortex layer into the trailing vortex is depicted and the associated characteristics of an increase of the circulation in the trailing vortex during the roll-up stage is proven as well.
Deutscher Luft- und Raumfahrtkongress 2016, Braunschweig
Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2016
21,0 x 29,7 cm, 12 Seiten
Stichworte zum Inhalt:
CFD, Wake-Vortex System