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Prediction of tip vortex self-induced motion parameters in terms of rotor blade loadingThe self-induced motion of curved vortex filaments at the tip of a helicopter rotor blade is investigated analytically. The derivation of a method for inviscid roll-up (IRU) is presented in detail, with attention to the cutoff-distance reformulation of the problem, a control-volume analysis of the self-induction properties of the vortex core, the adaptation of the roll-up method of Betz (1932) to IRU in three dimensions, the treatment of linear and elliptic loading, vortices with turbulent central cores, and the effect of cutoff distance on helicopter free-wake computations. Numerical results showing the significant effect of core properties on the geometry of a rotor wake in hover are presented in graphs and briefly characterized.
Document ID
19880030069
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Bliss, Donald B.
(Duke University Durham, NC, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Subject Category
Aerodynamics
Meeting Information
Meeting: National Specialists'' Meeting on Aerodynamics and Aeroacoustics
Location: Arlington, TX
Country: United States
Start Date: February 25, 1987
End Date: February 27, 1987
Sponsors: AHS
Accession Number
88A17296
Funding Number(s)
CONTRACT_GRANT: NAS2-11295
Distribution Limits
Public
Copyright
Other

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