Results 261 to 270 of about 4,272 (296)
Some of the next articles are maybe not open access.
A harmonic balance method for aerodynamic damping prediction in turbomachinery
European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, 2011The present paper investigates a time-domain harmonic balance method as an alternative to classical time-marching schemes for the stability study of turbomachineries toward flutter. This study is performed in a weak coupling approach, which requires to compute the fluid response to prescribed harmonic motions of the structure.
Sicot, Frédéric +2 more
openaire +2 more sources
34th Wind Energy Symposium, 2016
In this study, experimental airfoil data was taken in the Laminar Wind Tunnel of the Technical University of Berlin. A NACA0021 airfoil was tested with various sizes and positions of static microtabs while the foil underwent pitching oscillations.
Matthew Lennie +4 more
openaire +1 more source
In this study, experimental airfoil data was taken in the Laminar Wind Tunnel of the Technical University of Berlin. A NACA0021 airfoil was tested with various sizes and positions of static microtabs while the foil underwent pitching oscillations.
Matthew Lennie +4 more
openaire +1 more source
On the Influence of Blade Aspect Ratio on Aerodynamic Damping
Journal of Turbomachinery, 2019AbstractIn order to change the blade count (BC) of axial rotor designs, a scaling technique can be applied where the blades are scaled in axial and circumferential directions while maintaining the solidity. This technique allows to adjust the blade count without changing the steady-state aerodynamics, but the influences on the aerodynamic damping are ...
Patrick Buchwald +2 more
openaire +1 more source
Aeroelastic Panel Optimization with Aerodynamic Damping
AIAA Journal, 1975AFOSR TN-58-469, June 1958, Dept. of Aeronautics, Johns Hopkins University, Baltimore, Md. 5 Morkovin, M. V., "Effects of Compressibility on Turbulent Flows," in The Mechanics of Turbulence, Gordon and Breach, New York, 1964, pp. 367-380. 6 Klebanoff, P. S., "Characteristics of Turbulence in a Boundary Layer with Zero Pressure Gradient," Kept.
openaire +1 more source
Aerodynamic damping of sidewall bounded oscillating cantilevers
Journal of Fluids and Structures, 2014Abstract As a result of their simplicity, low power consumption, and relative ease of implementation, oscillating cantilevers have been investigated for use in multiple applications. However, the in situ operation in many cases, requires oscillating near one or more solid walls.
Andrew Eastman, Mark L. Kimber
openaire +1 more source
Aerodynamic Damping Measurements in a Transonic Compressor
Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; Process Industries; Technology Resources; General, 1982A method has been developed and demonstrated for the direct measurement of aerodynamic damping in a transonic compressor. The method is based on the inverse solution of the structural dynamic equations of motion of the blade-disk system. The equations are solved inversely to determine the forces acting on the system. If the structural dynamic equations
openaire +1 more source
Computation of Modal Aerodynamic Damping Using CFD
ASME 2003 Wind Energy Symposium, 2003This work focuses on the numerical evaluation of aerodynamic damping for a wind turbine rotor. A finite beam element code is used to describe the structure. Two types of aerodynamic models are compared. Firstly, two engineering semi-empirical dynamic stall models implemented in the structural code for modelling the aerodynamic forces are applied ...
Franck Bertagnolio +4 more
openaire +1 more source
Maximum Mistuned Vibration Amplitude With Aerodynamic Damping
Volume 7B: Structures and Dynamics, 2016Mistuning can dramatically increase the forced response of a bladed disk. In the case of damping coming from aerodynamic effects the situation is more complicated because the value of the damping is typically different for the different travelling wave modes of the system. This damping variability changes the effect of mistuning, and it can even result
Carlos Martel, Luo Cuiping
openaire +1 more source
Nonlinear Aerodynamic Damping in a Highly Loaded Vibrating Compressor Cascade
Volume 7A: Structures and Dynamics, 2019Abstract A numerical aeroelastic study of a 2D linear compressor cascade based on the non-rotating annular compressor cascade with a NACA3506 profile was performed using a one-way coupled technique (prescribed-motion approach). Subsonic and transonic flow conditions with strong shocks in the blade passage were imposed.
Schuff, Matthias, Chenaux, Virginie
openaire +2 more sources
Recent Improvements in the Measurement of Aerodynamic Damping Derivatives
2002The Oscillatory Motion Support (OMS), used in the German-Dutch Wind Tunnels — Low Speed Wind Tunnel Braunschweig (DNW-NWB) for the measurements of damping derivatives has undergone substantial changes and improvements. The changes in the mechanical system include a new hydraulic 6 degree-of-freedom platform for static model positioning and yaw, and a ...
Hübner, A.-R., Löser, T.
openaire +2 more sources