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Natural laminar flow experiments on modern airplane surfaces
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Holmes, B. J. Yip, L. P. Obara, C. J. |
| Copyright Year | 1984 |
| Description | Flight and wind-tunnel natural laminar flow experiments have been conducted on various lifting and nonlifting surfaces of several airplanes at unit Reynolds numbers between 0.63 x 10 to the 6th power/ft and 3.08 x 10 to the 6th power/ft, at Mach numbers from 0.1 to 0.7, and at lifting surface leading-edge sweep angles from 0 deg to 63 deg. The airplanes tested were selected to provide relatively stiff skin conditions, free from significant roughness and waviness, on smooth modern production-type airframes. The observed transition locations typically occurred downstream of the measured or calculated pressure peak locations for the test conditions involved. No discernible effects on transition due to surface waviness were observed on any of the surfaces tested. None of the measured heights of surface waviness exceeded the empirically predicted allowable surface waviness. Experimental results consistent with spanwise contamination criteria were observed. Large changes in flight-measured performance and stability and control resulted from loss of laminar flow by forced transition. Rain effects on the laminar boundary layer caused stick-fixed nose-down pitch-trim changes in two of the airplanes tested. No effect on transition was observed for flight through low-altitude liquid-phase clouds. These observations indicate the importance of fixed-transition tests as a standard flight testing procedure for modern smooth airframes. |
| File Size | 42267968 |
| Page Count | 145 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19840018592 |
| Archival Resource Key | ark:/13960/t1zd2rt4f |
| Language | English |
| Publisher Date | 1984-06-01 |
| Access Restriction | Open |
| Subject Keyword | Aerodynamics Flight Tests Stability Lifting Bodies Reynolds Number Velocity Distribution General Aviation Aircraft Contamination Laminar Boundary Layer Laminar Flow Airframes Wind Tunnel Tests Flow Visualization Detection Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
