Rotor noise due to atmospheric turbulence ingestion. I - Fluid mechanicsIn the present analytical procedure for the prediction of helicopter rotor noise generation due to the ingestion of atmospheric turbulence, different models for turbulence fluid mechanics and the ingestion process are combined. The mean flow and turbulence statistics associated with the atmospheric boundary layer are modeled with attention to the effects of atmospheric stability length, windspeed, and altitude. The turbulence field can be modeled as isotropic, locally stationary, and homogeneous. For large mean flow contraction ratios, accurate predictions of turbulence vorticity components at the rotor face requires the incorporation of the differential drift of fluid particles on adjacent streamlines.
Document ID
19860060741
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Simonich, J. C. (United Technologies Research Center East Hartford, CT, United States)
Amiet, R. K. (United Technologies Research Center East Hartford, CT, United States)
Schlinker, R. H. (United Technologies Research Center East Hartford, CT, United States)
Greitzer, E. M. (MIT Cambridge, MA, United States)