Aerodynamic loads on a multibladed helicopter rotor in hover and forward flight are calculated by solving the three-dimensional Euler equations in a rotating coordinate system on body-conforming curvilinear grids around the blades. The Euler equations are recast in absolute flow variables so that the absolute flow in the far field is uniform but the relative flow is nonuniform. The equations are solved for the absolute flow variables employing Jameson's finite-volume explicit Runge-Kutta time-stepping scheme. Rotor-wake effects are modeled in the form of a correction applied to the geometric angle of attack along the blades. This correction is obtained by computing the local induced downwash with a free-wake analysis program. The calculations are performed on a Cray X/MP for a model helicopter rotor, the OLS rotor, and the 500E rotor in hover and forward flight at various collective pitch angles. The results are compared with experimental data.
An Euler solver for calculating the flowfield of a helicopter rotor in hover and forward flight
Eine Eulerloesung zur Berechnung des Stroemungsfeldes eines Hubschrauberrotors beim Schwebe- und Vorwaertsflug
AIAA-Papers ; Jun ; 1-9
1987
9 Seiten, 11 Bilder, 9 Quellen
Conference paper
English
Free-Wake Computation of Helicopter Rotor Flowfield in Forward Flight
British Library Conference Proceedings | 1993
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