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An experimental investigation of the chopping of helicopter main rotor tip vortices by the tail rotor. part 2: high speed photographic study
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Cary, Charles M. |
| Copyright Year | 1987 |
| Description | The interaction of a free vortex and a rotor was recorded photographically using oil smoke and stroboscopic illumination. The incident vortex is normal to the plane of the rotor and crosses the rotor plane. This idealized aerodynamic experiment most nearly corresponds to helicopter flight conditions in which a tip vortex from the main rotor is incident upon the tail rotor while hovering. The high speed photographs reveal important features not observed using conventional photography where the image is the time average of varying instantaneous images. Most prominent is the strong interaction between the rotor tip vortex system and the incident vortex, resulting in the roll-up of the incident vortex around the (stronger) tip vortices and the resulting rapid destabilization of the deformed incident vortex. The viscous interaction is clearly shown also. Other forms of instabilities or wave-like behavior may be apparent from further analysis of the photographs. |
| File Size | 20420842 |
| Page Count | 41 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19880007295 |
| Archival Resource Key | ark:/13960/t76t5jv8f |
| Language | English |
| Publisher Date | 1987-09-08 |
| Access Restriction | Open |
| Subject Keyword | Aerodynamics Blade Tips Helicopter Tail Rotors High Speed Photography Interactional Aerodynamics Vortices Blade-vortex Interaction Flow Visualization Pressure Distribution Aeroacoustics Hovering Viscous Flow Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
