Loading...
Please wait, while we are loading the content...
Similar Documents
Hybrid wing body (hwb) slat noise analysis
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Thomas, Russell H. Czech, Michael Guo, Yueping Brunsniak, Leon |
| Copyright Year | 2013 |
| Description | This paper presents an analysis of the slat noise for Hybrid Wing Body (HWB) aircraft, based on a database from a 3% scale wind tunnel test. It is shown that the HWB slats are one of the dominant noise components, characterized by its broad spectral shape with a peak frequency that depends on both the mean flow velocity and the aircraft angle of attack, the former following the conventional Strouhal number scaling and the latter explainable by the dependence of the coherence length of the slat unsteady flows on the aircraft angle of attack. While the overall levels of the slat noise are shown to approximately follow the fifth power law in the flow Mach number, the effects of the Mach number manifest themselves in the noise spectra in both the amplitude and the spectral shape. The slat noise amplitude is shown to also depend on the angle of attack, assuming a minimum in the range of 3 to 5 degrees and increasing when the angle of attack moves away from this range. These features are all modeled and incorporated in slat noise prediction methodologies, extending the prediction capability from conventional aircraft designs to HWB configurations. Comparisons between predictions and data show very good agreements both in various parametric trends and in the absolute levels. The HWB aircraft is designed to operate at angles of attack much higher than those of conventional aircraft. This is shown to significantly increase the HWB slat noise. To further illustrate, the test data are extrapolated to full scale and compared with the slat noise of the Boeing 777 aircraft, showing that the former is higher the latter. |
| File Size | 912560 |
| Page Count | 19 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20130003186 |
| Archival Resource Key | ark:/13960/t1rg0r057 |
| Language | English |
| Publisher Date | 2013-01-07 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Wings Leading Edge Slats Wind Tunnel Tests Flow Velocity Spectra Shapes Unsteady Flow Angle of Attack Prediction Analysis Techniques Noise Spectra Noise Prediction Mach Number Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
