Loading...
Please wait, while we are loading the content...
Similar Documents
Analytical study of the effects of wind tunnel turbulence on turbofan rotor noise. [nasa ames 40 by 80 foot wind tunnel
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Gliebe, P. R. Kerschen, E. J. |
| Copyright Year | 1979 |
| Description | The influence of tunnel turbulence on turbofan rotor noise was carried out to evaluate the effectiveness of the NASA Ames 40 by 80 foot tunnel in simulating flight levels of fan noise. A previously developed theory for predicting rotor/turbulence interaction noise was refined and extended to include first-order effects of inlet turbulence anisotropy. This theory was then verified by carrying out extensive data/theory comparisons. The resulting model computer program was then employed to carry out a parametric study of the effects of fan size, blade number, and operating line on rotor/turbulence noise for outdoor test stand. NASA Ames wind tunnel, and flight inlet turbulence conditions. A major result of this study is that although wind tunnel rotor/turbulence noise levels are not as low as flight levels they are substantially lower than the outdoor test stand levels and do not mask other sources of fan noise. |
| File Size | 6574653 |
| Page Count | 127 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19800014610 |
| Archival Resource Key | ark:/13960/t4cp1x797 |
| Language | English |
| Publisher Date | 1979-12-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Acoustic Measurement Atmospheric Turbulence Rotor Blades Turbomachinery Anisotropy Turbofans Wind Tunnel Tests Turbulence Effects Inlet Flow Noise Generators Contraction Computer Programs 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 |
