Loading...
Please wait, while we are loading the content...
Similar Documents
Experimental study of acoustic loads on an upper-surface-blown stol airplane configuration. [langley full-scale wind tunnel tests
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Willis, C. M. Schoenster, J. A. |
| Copyright Year | 1979 |
| Description | Fluctuating pressure levels were measured on the flap and fuselage of an upper-surface-blown jet-flap airplane configuration in a wind tunnel. The model tested had turbofan engines with a bypass ratio of 3 and a thrust rating of 10 kN. Rectangular nozzles were mounted flush with the upper surface at 35 percent of the wing chord. Test parameters were flap deflection angle, jet impingement angle, angle of attack, free-stream velocity, spanwise location of the engine, and jet dynamic pressure. Load levels were high throughout the jet impingement region, with the highest levels (about 159 dB) occurring on the fuselage and near the knee of the flap. The magnitude of the forward-velocity effect appeared to depend upon the ratio of free-stream and jet velocities. Good agreement was obtained between fluctuating pressure spectra measured at jet dynamic pressures of 7 and 22 kPa when the spectra were scaled by nondimensional functions of dynamic pressure, velocity, and the empirical relationship between dynamic pressure and overall fluctuating pressure level. |
| File Size | 2001882 |
| Page Count | 58 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19800005623 |
| Archival Resource Key | ark:/13960/t4qk27492 |
| Language | English |
| Publisher Date | 1979-12-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Transducers Power Spectra Jet Impingement Trailing Edges Wind Tunnel Tests Wind Tunnel Models Short Takeoff Aircraft Aeroacoustics Aerodynamic Loads Sound Pressure Upper Surface Blown Flaps 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 |
