Ahmed, S.R. (1994) Numerical Simulation of Subsonic Unsteady Flow around Wings and Rotors. AIAA, 370 L'Enfant Promenade, SW, Washington DC 20024-2518, USA. Proceedings, AIAA 12th Applied Aerodynamics Conference, Colorado Spri ngs, 20.-23.06.1994.
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An unsteady 3D Panel method has been developed to compute the subsonic aerodynamics of finite thickness wings and multiblade rotors. The free wake is simulated by a lattice of shed and trailing vortices. The method is applied to wings in pitching and plunging motion, to a two blade and the four blade BO 105 hingeless rotor in hover. The four-blade rotor has also been studied in the forward flight descent and climb modes. Computed wake geometry of the wings agrees well with two-dimensional code results and with smoke trace experiment results. Prediction of pressure distribution on blade surface during hover agrees very well with wind tunnel test data and Euler solver results. Results for descent flight where severe blade vortex interaction (BVI) takes place are in fair agreement with the experiment. The time stepping scheme employed permits a detailed study of the wake development. This is done for the descent case of the BO 105 four blade rotor to indicate areas of possible severe BVI. No restrictions are placed on the prescribed wing or blade motion, blade profile, planform, twist etc. so that a single code can treat wings or multiblade rotors in a variety of flight conditions.
|Document Type:||Conference or Workshop Item (Paper)|
|Additional Information:||LIDO-Berichtsjahr=1994, pages=14,|
|Title:||Numerical Simulation of Subsonic Unsteady Flow around Wings and Rotors|
|Page Range:||pp. 938-951|
|Publisher:||AIAA, 370 L'Enfant Promenade, SW, Washington DC 20024-2518, USA|
|Keywords:||Wings in arbitrary unsteady motion, multiblade helicopter rotors, uns teady surface pressure, 3D panel method, free wake|
|Event Title:||Proceedings, AIAA 12th Applied Aerodynamics Conference, Colorado Spri ngs, 20.-23.06.1994|
|HGF - Research field:||UNSPECIFIED|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||other|
|DLR - Research area:||UNSPECIFIED|
|DLR - Program:||L DT - Drehflüglertechnologien|
|DLR - Research theme (Project):||L - The Quiet and Comfortable Rotorcraft|
|Location:||Köln-Porz , Braunschweig , Göttingen|
|Institutes and Institutions:||Institute of Aerodynamics and Flow Technology > Institut für Entwurfsaerodynamik|
|Deposited By:||elib DLR-Beauftragter|
|Deposited On:||03 Apr 2006|
|Last Modified:||27 Apr 2009 10:05|
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