Results from an Euler and a Full Potential Solver are compared for a nonlifting transonic hovering rotor. The correlation is very good on the blade, but the aerodynamic disturbances are damped by the Full Potential Code off the blade tip. The ability of both codes to provide near-field input data for acoustic predictions using Lighthill's Acoustic Analogy is checked. Acoustic results using Euler input data show a fairly good correlation with experiment and with direct Euler far-field calculations, even in the case of delocalization. On the contrary, the precision of the Full Potential results is insufficient for that purpose, and further work is needed to improve the code's stability and accuracy off the blade.
Aerdodynamic and acoustic calculations of transsonic nonlifting hovering rotors
Aerodynamische und akustische Berechnungen von transsonischen auftriebsfreien Rotoren im Schwebeflugzustand
Journal of the American Helicopter Society ; 41 , 2 ; 17-26
1996
10 Seiten, 21 Bilder, 17 Quellen
Aufsatz (Zeitschrift)
Englisch
Hubschrauber , Rotor (Drehflügel) , Aerodynamik , Schallemission , analytische Untersuchung , transsonischer Geschwindigkeitsbereich , Schweben , Auftrieb , Euler-Gleichung , Potenzialfunktion , Korrelation , Schallfeld , Vorhersage , Vergleichsmessung , Rechnerprogramm , Mach-Zahl , Fourier-Transformation , Schalldruck , Verifikation
Aerodynamic and acoustic calculations of transonic nonlifting hovering rotors
Online Contents | 1996
|Transsonic flows and numerical analysis
Tema Archiv | 1974
|Vortex theory for hovering rotors
AIAA | 1982
|Trailing-Edge Noise from Hovering Rotors
AIAA | 1982
|Laminar Separated Flow Nonlifting Ellipses
AIAA | 1975
|