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The 757 nlf glove flight test results
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Chen, A. W. Bielak, G. W. Runyan, L. Jim Behbehani, R. A. Rozendaal, Roger A. |
| Copyright Year | 1987 |
| Description | A major concern in the application of a laminar flow wing design to commercial transports is whether laminar flow can be sustained in the presence of the noise environment due to wing mounted turbofan engines. To investigate this issue, a flight test program was conducted using the Boeing 757 flight research airplane with a portion of the wing modified to obtain natural laminar flow. The flight test had two primary objectives. The first was to measure the noise levels on the upper and lower surface of the wing for a range of flight conditions. The second was to investigate the effect of engine noise on laminar boundary layer transition. The noise field on the wing and transition location on the glove were then measured as a function of the engine power setting at a given flight condition. The transition and noise measurement on the glove show that there is no apparent effect of engine noise on the upper surface transition location. On the lower surface, the transition location moved forward 2 to 3 percent chord. A boundary layer stability analysis to the flight data showed that cross flow disturbances were the dominant cause of transition at most flight conditions. |
| File Size | 6665565 |
| Page Count | 24 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19900003230 |
| Archival Resource Key | ark:/13960/t4bp4zv5m |
| Language | English |
| Publisher Date | 1987-12-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Design, Testing And Performance Flight Tests Engine Noise Transport Aircraft Aircraft Design Noise Spectra Insects Laminar Flow Airfoils Noise Intensity Shock Loads Tollmien-schlichting Waves Boundary Layer Transition Turbofan Engines Boundary Layer Stability Cross 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 |
