Loading...
Please wait, while we are loading the content...
Similar Documents
On the generation of side-edge flap noise. [part span trailing edge flaps
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Howe, M. S. |
| Copyright Year | 1981 |
| Description | A theory is proposed for estimating the noise generated at the side edges of part span trailing edge flaps in terms of pressure fluctuations measured just in-board of the side edge of the upper surface of the flap. Asymptotic formulae are developed in the opposite extremes of Lorentz contracted acoustic wavelength large/small compared with the chord of the flap. Interpolation between these limiting results enables the field shape and its dependence on subsonic forward flight speed to be predicted over the whole frequency range. It is shown that the mean width of the side edge gap between the flap and the undeflected portion of the airfoil has a significant influence on the intensity of the radiated sound. It is estimated that the noise generated at a single side edge of a full scale part span flap can exceed that produced along the whole of the trailing edge of the flap by 3 dB or more. |
| File Size | 2640638 |
| Page Count | 47 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19810016318 |
| Archival Resource Key | ark:/13960/t76t5gs77 |
| Language | English |
| Publisher Date | 1981-06-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Chords Geometry Asymptotes Green's Functions Aircraft Noise Lorentz Contraction Aerodynamic Noise Pressure Measurement Unsteady Flow Noise Generators Trailing Edge Flaps Aeroacoustics Sides 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 |
