The report presents the results of an experimental investigation of the dynamic airloads on an airfoil (Vertol 23010-1.58) immersed in reverse flow such as occurs on the retreating side of a helicopter rotor disc in forward flight. Forces and moments in two-dimensional flow were determined from airfoil differential pressures measured during pitching oscillation, mach number, reynolds number, and mean angle-of-attack ranges corresponded to those typically encountered under full-scale flight conditions. Frequencies of oscillation were varied between values corresponding to the 1/rev and typical first elastic torsional frequency of rotor blades. Pitching oscillation was related to normal force and pitching moment stall at barious angles of attack.
Wind Tunnel Investigation of Airfoils Oscillating in Reverse Flow. Volume I. Summary and Evaluation of Results
1970
90 pages
Report
Keine Angabe
Englisch
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