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High-angle-of-attack pneumatic lag and upwash corrections for a hemispherical flow direction sensor
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Deleo, Richard V. Heeg, Jennifer Ehernberger, L. J. Whitmore, Stephen A. Larson, Terry J. Hagen, Floyd W. |
| Copyright Year | 1987 |
| Description | As part of the NASA F-14 high angle of attack flight test program, a nose mounted hemispherical flow direction sensor was calibrated against a fuselage mounted movable vane flow angle sensor. Significant discrepancies were found to exist in the angle of attack measurements. A two fold approach taken to resolve these discrepancies during subsonic flight is described. First, the sensing integrity of the isolated hemispherical sensor is established by wind tunnel data extending to an angle of attack of 60 deg. Second, two probable causes for the discrepancies, pneumatic lag and upwash, are examined. Methods of identifying and compensating for lag and upwash are presented. The wind tunnel data verify that the isolated hemispherical sensor is sufficiently accurate for static conditions with angles of attack up to 60 deg and angles of sideslip up to 30 deg. Analysis of flight data for two high angle of attack maneuvers establishes that pneumatic lag and upwash are highly correlated with the discrepancies between the hemispherical and vane type sensor measurements. |
| File Size | 974258 |
| Page Count | 21 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19870014183 |
| Archival Resource Key | ark:/13960/t0wq4vk2j |
| Language | English |
| Publisher Date | 1987-05-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Instrumentation Pressure Sensors Flight Tests F-14 Aircraft Subsonic Speed Upwash Flow Distribution Wind Tunnel Tests Angle of Attack Remote Sensing Sideslip Pneumatic Probes Time Lag 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 |
