The flowfield of a helicopter is very complex, and, for example, there is the mutual aerodynamic interference between the main rotor and the airframe and between the main rotor and the tail rotor, as well as between the airframe and the tail rotor. The strength of the interaction depends on the relative position and proximity of the individual components, size, shape, type of the wake geometry, and flight conditions. A method for analyzing the mutual aerodynamic interaction between a rotor and an airframe model has been developed. This technique models the rotor implicitly through the source terms of the momentum equations. A three-dimensional, incompressible, laminar, Navier-Stokes solver in cylindrical coordinates was developed for analyzing the rotor-airframe problem. The calculations are performed on a simplified rotor-airframe model at an advance ratio of 0.1. The airframe surface pressure predictions are found to be in good agreement with wind-tunnel test data. Results are also presented for velocity and pressure field distributions in the wake of the rotor.
Navier-Stokes calculations of rotor-airframe interaction in forward flight
Navier-Stokes-Berechnungen von Rotor-Rumpf-Wechselwirkungen im Vorwärtsflug
Journal of the American Helicopter Society ; 40 , 2 ; 57-67
1995
11 Seiten, 23 Bilder, 1 Tabelle, 24 Quellen
Aufsatz (Zeitschrift)
Englisch
Hubschrauber , Rotor (Drehflügel) , Flugzeugrumpf , Aerodynamik , Systemanalyse , Wechselwirkung , Navier-Stokes-Gleichung , Rechenmodell , Koordinatensystem , Windkanal , Vergleichsmessung , Strömungsgeschwindigkeit , Druckverteilung , Wirbelströmung , Flugeigenschaft , Fourier-Reihe , Verifikation
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