A portion of a PV-2 helicopter rotor blade has been tested in the 6- by 6-foot test section of the Langley stability tunnel to determine if the aerodynamic characteristics were seriously affected by cross flow or fabric distortion. The outer portion of the blade was tested as a reflection plane model pivoted about the tunnel wall to obtain various angles of cross flow over the blade. Because the tunnel wall acts as a plane of sytry, the measured aerodynamic characteristics correspond to those of an airfoil having various angles of sweepforward and sweepback. Tests were made with the vents on the lower surface open and also with the vents sealed and the internal pressure held at -20 inches of water producing an internal pressure coefficient of -1.059. The change in contour resulting from the range of internal pressures used had very little effect on the aerodynamic characteristics of the blade. The test methods were considered to simulate inadequately the flow conditions over the rotor blade because the effects of cross flow were limited to conditions corresponding to sweep of the blade. The results indicated that this type of cross flow had only minor effects on the aerodynamic characteristics of the blade. It is believed, therefore, that future tests to determine the effects on the aerodynamic characteristics of cross flow should utilize complete rotors.
Wind-Tunnel Tests of a Portion of a PV-2 Helicopter Rotor Blade
1945
45 pages
Report
Keine Angabe
Englisch
Engineering Index Backfile | 1947
|Spinning Rotor Blade Tests in Icing Wind Tunnel
AIAA | 2009
|Spinning Rotor Blade Tests in Icing Wind Tunnel
British Library Conference Proceedings | 2009
|Wind tunnel tests of helicopter blade designs optimized for minimum vibration
Tema Archiv | 1989
|