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A vortex model dealing with the airstream at the rotor blade of a helicopter
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Isay, W. H. |
| Organization | The National Aeronautics and Space Administration (NASA) |
| Copyright Year | 1972 |
| Abstract | WITH THE AID OF THE NONSTATIONARY VORTEX LINE-SUPPORT THEORY AN APPROXIMATE METHOD IS GIVEN FOR CALCULATING THE BUOYANCY DISTRIBUTION AT ROTOR BLADES IN FORWARD FLIGHT. THE THEORY PRESENTED TAKES INTO CONSIDERATION, WITH REFERENCE TO VORTEX GEOMETRY, A NONUNIFORM (ESPECIALLY TRAPEZOIDAL) FLOW THROUGH THE PLANE OF THE ROTOR, AS WELL AS THE UNROLLING PROCESS AND THE CONTRACTION OF THE FREE TRANSVERSE VORTEX. IN THE DETERMINATION OF THE CIRCULATION DISTRIBUTION OF THE ROTOR AIRFLOW, A SPECIAL CASE IS TREATED WHERE THE BLADES PENETRATE THE UNROLLED AND CONTRACTED TIP VORTEX AND ROOT VORTEX OF THE SOMETIMES FORWARD-DRIVING AIRFOILS. FORMULAS FOR COMPUTING ACOUSTIC PRESSURE FIELDS RADIATED FROM A ROTOR (COMPRESSIBLE TREATMENT) ARE INCLUDED. |
| File Size | 1922687 |
| File Format | |
| Alternate Webpage(s) | http://www.archive.org/details/nasa_techdoc_19720017340 |
| Archival Resource Key | ark:/13960/t02z1zb2g |
| Language | English |
| Publisher Date | 1972-04-01 |
| Access Restriction | Open |
| Subject Keyword | Lunar Rocks Lunar Soil Radioactive Isotopes Apollo 12 Flight Apollo 14 Flight Apollo 15 Flight Chemical Analysis Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
