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Measurement and prediction of model-rotor flow fieldsThis paper shows that a laser velocimeter can be used to measure accurately the three-component velocities induced by a model rotor at transonic tip speeds. The measurements, which were made at Mach numbers from 0.85 to 0.95 and at zero advance ratio, yielded high-resolution, orthogonal velocity values. The measured velocities were used to check the ability of the ROT22 full-potential rotor code to predict accurately the transonic flow field in the crucial region around and beyond the tip of a high-speed rotor blade. The good agreement between the calculated and measured velocities established the code's ability to predict the off-blade flow field at transonic tip speeds. This supplements previous comparisons in which surface pressures were shown to be well predicted on two different tips at advance ratios to 0.45, especially at the critical 90 deg azimuthal blade position. These results demonstrate that the ROT22 code can be used with confidence to predict the important tip-region flow field, including the occurrence, strength, and location of shock waves causing high drag and noise.
Document ID
19850058532
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Owen, F. K.
(NASA Ames Research Center Moffett Field, CA, United States)
Tauber, M. E.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 12, 2013
Publication Date
July 1, 1985
Subject Category
Aerodynamics
Report/Patent Number
AIAA PAPER 85-1558
Accession Number
85A40683
Distribution Limits
Public
Copyright
Other

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