The flow field and performance of the RAH-66 FANTAIL in hover and sideward flight were analyzed using CFD techniques (Computational Fluid Dynamics). The results were used in the detailed design of the FANTAIL structure, blades, and transmission cooling system. A Navier-Stokes code developed for ducted fans by the first author was modified and employed. This analysis solves the incompressible, laminar Navier-Stokes equations in an axisymmetric non-body fitted coordinate system to reduce problem set-up time. The fan was represented as fully-coupled, time-averaged momentum source terms in the momentum equations. This unique approach makes the code an ideal tool for the solution of detail design problems in a timely manner. Most existing CFD formulations do not have the capability to easily represent a fan installation. In this paper, the predicted RAH-66 FANTAIL flow field and performance are compared with test data to validate the analysis. The analysis appeared to accurately capture the nature of the FANTAIL flow fields in all conditions including the very complex vortex ring state. Performance correlations showed good agreement with the measured trends. Overall, the demonstrated accuracy was acceptable for analyzing many detailed design issues. A brief discussion of some specific design issues addressed using the CFD results is also provided.
Detailed aerodynamic analysis of the RAH-66 FANTAIL using CFD
Eine detaillierte aerodynamische Analyse des RAH-66 Heckrotorsystems unter Anwendung numerischer Strömungsberechnungsverfahren
Journal of the American Helicopter Society ; 42 , 4 ; 310-320
1997
11 Seiten, 27 Bilder, 8 Quellen
Aufsatz (Zeitschrift)
Englisch
Hubschrauber , Rotor (Drehflügel) , Aerodynamik , Strömungsfeld , Betriebseigenschaft , Auslegung (Dimension) , Navier-Stokes-Gleichung , Rechnersimulation , inkompressible Strömung , laminare Strömung , Koordinatensystem , Impulsgleichung , Lösung (Mathematik) , Flugverhalten , Wirbelelement , Korrelation , numerische Strömungsberechnung
Detailed Aerodynamic Analysis of the RAH-66 FANTAIL (TM) Using CFD
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