DGLR-Publications Database - Detailview

Title:

Experimental Investigation into the Onset of Stall Flutter on Tiltrotor Blades

Author(s):
A.D. Croke, D. Zagaglia , M.A. Woodgate, R.B. Green, G.N. Barakos
Abstract:
A wind tunnel investigation into the stall of tiltrotor blades in propeller mode was undertaken. A custom blade set was instrumented with fully bridged axial strain gauges to monitor the flap bending strain at two radial locations. Propeller torque data was also analysed. The propeller was tested at varying blade pitch angles, advance ratios and rotational frequencies to clearly identify the blade stall boundary. Stall onset manifested in the strain results as a departure from linear behaviour of the bending strain versus pitch angle curves, an increase in the standard deviation of the strain gauge measurements, the presence of non-harmonic content in the strain spectra and a non consistent oscillation amplitude in the strain time history. For an increasing blade pitch angle, a sudden development of stall was found with variation in RPM as opposed to a more gradual onset as the advance ratio was increased.
Event:
49th European Rotorcraft Forum 2023, Bückeburg, 2023
Mediatype:
Conference Paper
Language:
englisch
Format:
21,0 x 29,7 cm, 12 Pages
Published in:
DGLR-Bericht, 2023, 2023-01, 49th European Rotorcraft Forum 2023 - Proceedings; S.1-12; 2023; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn
Price:
NA
ISBN:
ISSN:
Comment:
Classifikation:
Keywords:
aerodynamics, propellers, wind tunnel
Available:
Bestellbar
Published:
2023


This Document is part of a superordinate publication:
49th European Rotorcraft Forum 2023 - Proceedings