Numerical investigations of the interference between jet and high-lift devices for transport aircraft

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Numerical investigations of the interference between jet and high-lift devices for transport aircraft

Rudnik, R. / Ronzheimer, A. / Schenk, M. / Rossow, C.C.

A numerical investigation of a generic three-dimensional high-wing configuration with an externally blown high-lift system is presendet. The theoretical approach is based on the solution of the Euler-equations. Referring to special requirements for the treatment of complex high-lift configurations, some features of the grid generation system and the flow solver are briefly discussed. Because the problem under consideration is momentum-dominated, the basic flow phenomena as the deflection of the jet at the flap/tap system and the influence on the spanwise lift distribution are consistently predicted by the inviscid approach. To obtain qualitatively reliable solutions for general high-lift problems, the incorporation of the viscous effects appears to be necessary. This is demonstrated by the invstigation of a three-element airfoil using a Navier-Stokes solver with a two-equation turbulence model. Future work is focussing on the treatment of three-dimensional problems based on the Navier-Stokes equations. As a first step in this direction the grid generation for a half-span flapped wing is presented.