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An Exploration of Radial Flow on a Rotating Blade in Retreating Blade Stall
Journal of the American Helicopter Society, 2013The nature of radial flow during retreating blade stall on a two-bladed teetering rotor with cyclic pitch variation is investigated using laser sheet visualization and particle image velocimetry in a low-speed wind tunnel. The velocity field above the retreating blade at 270◦ azimuth shows the expected development of a radially directed jet layer close
Vrishank Raghav, Narayanan Komerath
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The Effect of Blade Geometry on the Normal Force Distribution of a Rotating Blade
43rd AIAA Aerospace Sciences Meeting and Exhibit, 2005The effect of rotation on the segment cn characteristics has been investigated with emphasis on the consequences of the blade geometry. The data used came from field tests and wind tunnel experiments performed by NREL (National Renewable Energy Laboratory) on rotor blades with pressure measurements at different radial positions.
Ruud Rooij, Gerard Schepers
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Bending Vibration of a Rotating Blade Vibrating in the Plane of Rotation
Journal of Applied Mechanics, 1949Abstract An analysis is developed for the uncoupled bending vibration of a rotating blade which is vibrating in the plane of rotation. The numerical method used permits the determination of any mode of vibration by a series of tabular calculations.
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Flapwise vibration control of a rotating blade
2017 8th International Conference on Mechanical and Aerospace Engineering (ICMAE), 2017In this research, the vibration of a rotating functionally graded carbon nanotube reinforced composite (FG-CNTRC) blade is studied and an active controller scheme is applied to damp these vibrations. The composite blade has been reinforce by single walled carbon nanotubes.
Mohammad Azadi, Behzad Hasanshahi
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Delayed Stall Modeling of the Rotating Blades
AIP Conference Proceedings, 2010Most aerodynamic design tools for horizontal‐axial wind turbines are based on the blade‐element momentum theory (BEM). Due to the nature of this theory, the design tools need 2‐D steady sectional lift and drag curves as an input. In practice, flow over a wind turbine rotor blade is neither two‐dimensional nor steady, and is affected by rotation ...
Alexandru Dumitrache +5 more
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Vibrations of Cracked Rotating Blades
1992A rotating blade with a single transverse crack is considered. The proposed model is a torsionally rigid, non-pretwisted Bernoulli-Euler beam of extremely different bending stiffnesses. Two fields are connected by a local spring element characterizing the reduced stiffness of the crack region. The governing nonlinear boundary value problem is solved in
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Free transverse vibration of rotating blades in a bladed disk assembly
Acta Mechanica, 2012zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Rotating vibration behavior of the turbine blades with different groups of blades
Journal of Sound and Vibration, 2004Abstract The rotating vibration behaviors of full cycle of 60 blades are studied in this report. The dynamic analysis of two different structures in one of which there are 10 groups of 6 blades and in the other 5 groups of 12 blades, is performed to investigate behavior deviation.
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Nonlinear vibrations of a rotating pretwisted blade
Computers & Structures, 1975Abstract An analysis for evaluation of the nonlinear modes of vibration of a pretwisted nonuniform cantilevered blade of unsymmetrical cross-section mounted on the periphery of a rotating disk, is presented. The effects of shear deformation, rotatory inertia and Coriolis forces are included.
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Nonlinear dynamic behavior of rotating blade with breathing crack
Frontiers of Mechanical Engineering, 2021Zhu Mao, Xuefeng Chen, Ruqiang Yan
exaly