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Effects of acoustic sources
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Jones, Michael G. Schoenster, James A. |
| Copyright Year | 1987 |
| Description | An experiment was conducted to determine the effect of acoustics on the laminar flow on the side of a nacelle. A flight test was designed to meet this goal and a brief review of the purpose is given. A nacelle with a significant length of laminar flow was mounted on the wing of NASA OV-1. Two noise sources are also mounted on the wing: one in the center body of the nacelle; the second in a wing mounted pod outboard of the nacelle. These two noise sources allow for a limited study of the effect of source direction in addition to control of the acoustic level and frequency. To determine the range of Tollmien-Schlichting frequencies, a stability analysis using the pressure coefficient distribution along the side of the nacelle was performed. Then by applying these frequencies and varying the acoustic level, a study of the receptivity of the boundary layer to the acoustic signal, as determined by the shortening of the length of laminar flow, was conducted. Results are briefly discussed. |
| File Size | 2401617 |
| Page Count | 9 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19900003237 |
| Archival Resource Key | ark:/13960/t50g8js7b |
| Language | English |
| Publisher Date | 1987-12-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Flight Tests Pressure Distribution Aerodynamic Coefficients Nacelles Noise Generators Acoustic Frequencies Noise Spectra Laminar Flow Noise Intensity Tollmien-schlichting Waves Boundary Layer Transition Aeroacoustics Boundary Layer Flow Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
