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High speed turboprop aeroacoustic study (counterrotation). volume 2: computer programs
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Gliebe, P. R. Mani, R. Whitfield, C. E. |
| Copyright Year | 1990 |
| Description | The isolated counterrotating high speed turboprop noise prediction program developed and funded by GE Aircraft Engines was compared with model data taken in the GE Aircraft Engines Cell 41 anechoic facility, the Boeing Transonic Wind Tunnel, and in the NASA-Lewis 8 x 6 and 9 x 15 wind tunnels. The predictions show good agreement with measured data under both low and high speed simulated flight conditions. The installation effect model developed for single rotation, high speed turboprops was extended to include counter rotation. The additional effect of mounting a pylon upstream of the forward rotor was included in the flow field modeling. A nontraditional mechanism concerning the acoustic radiation from a propeller at angle of attack was investigated. Predictions made using this approach show results that are in much closer agreement with measurement over a range of operating conditions than those obtained via traditional fluctuating force methods. The isolated rotors and installation effects models were combined into a single prediction program. The results were compared with data taken during the flight test of the B727/UDF (trademark) engine demonstrator aircraft. |
| File Size | 4603430 |
| Page Count | 210 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19920022004 |
| Archival Resource Key | ark:/13960/t01022v3b |
| Language | English |
| Publisher Date | 1990-07-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Flight Tests Turboprop Aircraft Sound Waves Propeller Noise Transonic Wind Tunnels Turboprop Engines Counter Rotation Computer Programs Mounting Anechoic Chambers Flow Distribution Noise Prediction Aircraft Aeroacoustics 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 |
