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

Lütke, Benjamin; Nuhn, Johannes; Govers, Yves; Schmidt, Moritz

doi:10.1017/aer.2016.74

Cited by 6 publications

(3 citation statements)

References 20 publications

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“…Previous 2D and 2.5D aeroelastic experiments in the Transonic Wind Tunnel Göttingen (TWG) exhibited the complex-ity of these kind of experiments, where combined measurements of model deformation, integral blade bending moment and surface pressure distribution were conducted (Refs. [3][4][5][6][7][8]. In addition, numerical (Refs.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Stall Investigation on a Rotating Semielastic Double-swept Rotor Blade at the Rotor Test Facility Göttingen

Müller

Weiss

Braukmann

2023

j am helicopter soc

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Experimental investigations of three-dimensional dynamic stall on a four-bladed Mach-scaled semielastic rotor with an innovative double-swept rotor blade planform are presented. The study focuses on the coupling between the aeroelastic behavior of the blade and the underlying aerodynamics. Blade bending moment and flap displacement measurements were conducted using strain gauges and optical tracking of blade tip markers. The aerodynamic behavior was characterized by means of unsteady surface pressure measurements using unsteady pressure-sensitive paint (iPSP) across the outer 65% of the blade span and fast response pressure transducers at discrete locations. Different cyclic-pitch settings were investigated at a rotation frequency of frotor = 23.6 Hz that corresponds to blade tip Mach and Reynolds numbers of Mtip = 0.282–0.285 and Retip = 5.84-5.95 × 105. The findings reveal a detailed insight into the nonlinear behavior in the flap movement during downstroke. iPSP and pressure transducer data indicate that this nonlinear flap behavior is caused by a radially phase-shifted dynamic stall process at the forward and backward swept part of the blade.

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Section: Introductionmentioning

confidence: 99%

Dynamic Stall Investigation on a Rotating Semielastic Double-swept Rotor Blade at the Rotor Test Facility Göttingen

Müller

Weiss

Braukmann

2023

j am helicopter soc

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Dynamic Stall Investigation on a Rotating semi-elastic Double-swept Rotor Blade at the Rotor Test Facility Gottingen

Müller¹,

Braukmann²,

Weiss³

2022

Proceedings of the Vertical Flight Society 78th Annual Forum

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Experimental investigations of three-dimensional dynamic stall on a four-bladed Mach-scaled semi-elastic rotor with an innovative double-swept rotor blade planform are presented. The study focuses on the coupling between the aeroelastic behavior of the blade and the underlying aerodynamics. Blade bending moment and flap displacement measurements were conducted using strain gauges and optical tracking of blade tip markers. The aerodynamic behavior was characterized by means of unsteady surface pressure measurements using unsteady pressure-sensitive paint (iPSP) across the outer 65 % of the blade span and fast response pressure transducers at discrete locations. Different cyclicpitch settings were investigated at a rotation frequency of frotor = 23.6 Hz, that corresponds to blade tip Mach and Reynolds numbers of Mtip = 0.282- 0.285 and Retip = 5.84- 5.95 x 105. The findings reveal a detailed insight into the non-linear behavior in the flap movement during downstroke. iPSP and pressure transducer data indicates that this non-linear flap behavior is caused by a radially phase-shifted dynamic stall process at the forward and backward swept part of the blade.

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“…55) where an Euler wall was used at the attaching end, experimentally this results in the initial dynamic stall appearing at the junction between the wind tunnel wall and the wing, and a correspondingly strong interaction between the wind tunnel and the wing, see Ref. 56.Alternative examples have used positive twist and a range of airfoils (Refs 57,58). to move the point of initial stall outboard, creating aerodynamics which are more easily computed with CFD without considering the complete wind tunnel (Ref 59…”

mentioning

confidence: 99%

Rotating Wing Dynamic Stall: State of the Art and Future Directions

Gardner

Jain

et al. 2020

Proceedings of the Vertical Flight Society 76th Annual Forum

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Dynamic stall has been studied for more than fifty years; in the last decade significant advances have been accomplished in the understanding, prediction, modeling and control of dynamic stall on rotors. In September 2019, an Army Research Office-funded workshop was held at the Georgia Institute of Technology to evaluate the state of the art and future directions in the understanding and control of dynamic stall found on rotors, specifically for vertical lift vehicles. Approximately forty attendees drawn from top experts in the field to graduate students convened to discuss experimental, computational, theoretical, and control research in the field over a two-day period. This paper provides a summary of the findings from this workshop, including a synopsis of best practices for experiments and first-principles-based computational prediction of rotor dynamic stall. Experimental data sets are discussed, as well the direction of research for empirical (non-first-principles) modeling and control of dynamic stall.

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

Cited by 6 publications

References 20 publications

Dynamic Stall Investigation on a Rotating Semielastic Double-swept Rotor Blade at the Rotor Test Facility Göttingen

Dynamic Stall Investigation on a Rotating Semielastic Double-swept Rotor Blade at the Rotor Test Facility Göttingen

Dynamic Stall Investigation on a Rotating semi-elastic Double-swept Rotor Blade at the Rotor Test Facility Gottingen

Rotating Wing Dynamic Stall: State of the Art and Future Directions

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