A Summary of the Development of Integral Aerodynamic Methods for the Computation of Rotor Wake Interactions.
Final rept. 1 Aug 81-30 Aug 84,
ANALYTICAL METHODS INC REDMOND WA
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The purpose of the research reported here is to develop basic methodology for a generalized forward flight aerodynamic analysis method for isolates rotors. All of the work thus far has been concerned with the development of integral methods. Efforts have concentrated on analytical modeling studies and code development for fundamental vortexblade interactions that occur in forward flight. Calculations show that vortex core deformations can be simulated but that numerical errors in the core growth should be removed in order to study such phenomena as bursting. The computed trajectory of a tip vortex passing another wing is also validated with experiment as well as the prediction of vortex induced separations. The calculation of the rotor wake in hover has been improved and the importance of secondary vortex roll ups for a modern rotor is discussed. Finally, a time stepping panel method has been formulated and verified by application to impulsively started wings. A pilot code version for unsteady rotor motions is described along with its preliminary application to a two bladed rotor.
- Fluid Mechanics