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Flow visualization study of spanwise blowing applied to the f-4 fighter aircraft configuration. [water tunnel test using a 1/48-scale model
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Lorincz, D. J. |
| Copyright Year | 1980 |
| Description | Water tunnel studies were performed to define the changes that occur in vortex flow fields above the wing due to spanwise blowing over the inboard and outboard wing panels and over the trailing-edge flaps. Flow visualization photographs were obtained for angles of attack up to 30 deg and sideslip angles up to 10 deg. The sensitivity of the vortex flows to changes in flap deflection angle, nozzle position, and jet momentum coefficient was determined. Deflection of the leading edge flap delayed flow separation and the formation of the wing vortex to higher angles of attack. Spanwise blowing delayed the breakdown of the wing vortex to farther outboard and to higher angles of attack. Spanwise blowing over the trailing edge flap entrained flow downward, producing a lift increase over a wide range of angles of attack. The sweep angle of the windward wing was effectively reduced in sideslip. This decreased the stability of the wing vortex, and it burst farther inboard. Reduced wing sweep required a higher blowing rate to maintain a stable vortex. A vortex could be stabilized on the outboard wing panel when an outboard blowing nozzle was used. Blowing from both an inboard and an outboard nozzle was found to have a favorable interaction. |
| File Size | 6734102 |
| Page Count | 89 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19810012480 |
| Archival Resource Key | ark:/13960/t3227qk4t |
| Language | English |
| Publisher Date | 1980-08-01 |
| Access Restriction | Open |
| Subject Keyword | Aerodynamics Sweep Angle Nozzle Geometry Leading Edge Flaps Deflection Scale Models Vortices Flow Visualization F-4 Aircraft Spanwise Blowing Angle of Attack Trailing Edge Flaps Water Tunnel Tests Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
