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Design of a rotor blade tip for the investigation of dynamic stall in the transonic wind-tunnel Göttingen

Published online by Cambridge University Press:  04 July 2016

B. Lütke ,
J. Nuhn ,
Y. Govers  and
M. Schmidt
B. Lütke*
Affiliation:
DLR, Department of Aeroelasticity, Göttingen, Germany
J. Nuhn
Affiliation:
DLR, Department of Aeroelasticity, Göttingen, Germany
Y. Govers
Affiliation:
DLR, Department of Aeroelasticity, Göttingen, Germany
M. Schmidt
Affiliation:
DLR, Systemhaus Technik, Brunswick, Germany
*
[email protected]
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Abstract

The aerodynamic and structural design of a pitching blade tip with a double-swept planform is presented. The authors demonstrate how high-fidelity finite element (FE) and computational fluid dynamic (CFD) simulations are successfully used in the design phase. Eigenfrequencies, deformation, and stress distributions are evaluated by means of a three-dimensional (3D) FE model. Unsteady Reynolds-averaged Navier-Stokes (RANS) simulations are compared to experimental data for a light dynamic stall case at Ma = 0.5, Re = 1.2 × 106. The results show a very good agreement as long as the flow stays attached. Tendencies for the span-wise location of separation are captured. As soon as separation sets in, discrepancies between experimental and numerical data are observed. The experimental data show that for light dynamic stall cases at Ma = 0.5, a factor of safety of FoS = 2.0 is sufficient if the presented simulation methods are used.

Keywords

Structural and aerodynamic designdynamic stallhelicopterdouble-swept rotor blade tiptransonic wind-tunnelexperimentCFDFEM
Type
Research Article
Information
The Aeronautical Journal , Volume 120 , Issue 1232 , October 2016 , pp. 1509 - 1533
Copyright
Copyright © Royal Aeronautical Society 2016 

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