The 3-D wake measurements near a hovering rotor for determining profile and induced drag
- Author
- Mcalister, K. W.
- Published
- Aug 1, 1995.
- Physical Description
- 1 electronic document
- Additional Creators
- Schuler, C. A., Branum, L., and Wu, J. C.
Online Version
- hdl.handle.net , Connect to this object online.
- Restrictions on Access
- Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access - Summary
- Primarily an experimental effort, this study focuses on the velocity and vorticity fields in the near wake of a hovering rotor. Drag terminology is reviewed, and the theory for separately determining the profile-and-induced-drag components from wake quantities is introduced. Instantaneous visualizations of the flow field are used to center the laser velocimeter (LV) measurements on the vortex core and to assess the extent of the positional mandering of the trailing vortex. Velocity profiles obtained at different rotor speeds and distances behind the rotor blade clearly indicate the position, size, and rate of movement of the wake sheet and the core of the trailing vortex. The results also show the distribution of vorticity along the wake sheet and within the trailing vortex.
- Other Subject(s)
- Collection
- NASA Technical Reports Server (NTRS) Collection.
- Note
- Document ID: 19960003031.
Accession ID: 96N13040.
NAS 1.60:3577.
A-950078.
ATCOM-TR-95-A-006.
NASA-TP-3577. - Terms of Use and Reproduction
- No Copyright.
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