An extensive computational investigation of a generic high-lift configuration comprising a wing and a half-span flap reveals details of the mean flowfield for flap deflections of 29 deg and 39 deg. The computational effort involves solutions of the thin-layer form of the Reynolds-averaged Navier-Stokes equations. For both flap deflections, the steady results show the presence of a dual-vortex system: a strong vortex forming on the lower portion of the flap side edge and a weaker one forming near the edge on the flap top surface. Downstream, the vortex on the flap side edge grows and eventually merges with the vortex on the flap top surface. Comparison of on- and off-surface flow quantities with previous experimental measurements of the authors shows remarkable agreement. For the 39-deg flap deflection, the calculation also reveals the occurrence of a vortex breakdown, which is corroborated by five-hole probe velocity measurements performed in the Quiet Flow Facility at NASA Langley Research Center. The presence of the vortex breakdown significantly alters the flowfield near the side edge.
Reynolds-averaged Navier-Stokes computations of a flap-side-edge flowfield
Reynoldsgemittelte Navier-Stokes-Berechnungen eines Strömungsfeldes an der Kante einer Tragflügelseitenklappe
AIAA Journal ; 37 , 1 ; 14-22
1999
9 Seiten, 19 Bilder, 26 Quellen
Aufsatz (Zeitschrift)
Englisch
FLUID DYNAMICS - Reynolds-Averaged Navier-Stokes Computations of a Flap-Side-Edge Flowfield
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