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Euler solutions for self-generated rotor blade-vortex interactionsA finite-difference procedure was developed, on the basis of the conservation form of the unsteady three-dimensional Euler equations, for the prediction of rotor blade-vortex interactions (BVIs). Numerical solution procedures were obtained for the analysis of the model parallel BVIs and the more realistic helicopter self-generated-rotor BVIs. It was found that, for self-generated subcritical interactions, the accuracy of the predicted leading edge pressures relied heavily on the user-specified vortex core radius and on the CAMRAD-code-predicted geometry of the interaction vortex elements and their relative orientation with respect to the blade. It was also found that the free-wake model used in CAMRAD to predict the tip vortex trajectory for use in the Euler solution yields lower streamwise and higher axial wake convective velocities than those inferred from the experimental data.
Document ID
19900051668
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hassan, A. A.
(McDonnell Douglas Helicopter Co. Mesa, AZ, United States)
Tung, C.
(NASA Ames Research Center; U.S. Army, Aeroflightdynamics Directorate, Moffett Field CA, United States)
Sankar, L. N.
(Georgia Institute of Technology Atlanta, United States)
Date Acquired
August 14, 2013
Publication Date
June 1, 1990
Subject Category
Aerodynamics
Report/Patent Number
AIAA PAPER 90-1588
Accession Number
90A38723
Distribution Limits
Public
Copyright
Other

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