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Comparison of options for reduction of noise in the test section of the nasa langley 4x7m wind tunnel, including reduction of nozzle area
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Hayden, R. E. |
| Copyright Year | 1984 |
| Description | The acoustically significant features of the NASA 4X7m wind tunnel and the Dutch-German DNW low speed tunnel are compared to illustrate the reasons for large differences in background noise in the open jet test sections of the two tunnels. Also introduced is the concept of reducing test section noise levels through fan and turning vane source reductions which can be brought about by reducing the nozzle cross sectional area, and thus the circuit mass flow for a particular exit velocity. The costs and benefits of treating sources, paths, and changing nozzle geometry are reviewed. |
| File Size | 1928347 |
| Page Count | 58 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19850006358 |
| Archival Resource Key | ark:/13960/t3712wt7s |
| Language | English |
| Publisher Date | 1984-09-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Fans Costs Wind Tunnels Noise Reduction Helicopters Low Speed Wind Tunnels Background Noise Rotary Wings Nozzle Geometry Acoustic Properties Vanes Aeroacoustics Mass Flow Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
