Results 271 to 280 of about 105,358 (290)
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Dynamic Stall Experiments on Oscillating Airfoils
AIAA Journal, 1975Dynamic stall and unsteady boundary layer separation have been studied in incompressible flow at moderately large Reynolds numbers. By varying the leading-edge geometry of an NACA 0012 airfoil, three different types of stall were produced. For most of the configurations studied, including the basic NACA 0012 profile, dynamic stall was found not to ...
W. MCCROSKEY, L. CARR, K. MCALISTER
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Revisiting unresolved dynamic stall phenomena
38th Aerospace Sciences Meeting and Exhibit, 2000In a series of dynamic stall tests, performed 1968 with a finite-span wing model having a NACA-0012 airfoil section, very unusual C,(a) characteristics were obtained by varying the Reynolds number as well as using fixed and free boundary layer transition.
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Dynamic stall on a supercritical airfoil
Aerospace Science and Technology, 2005Summary: For the present investigations of dynamic stall a supercritical airfoil was chosen. This new airfoil designed by DLR will be used in dynamic stall control research activities (project ADASYS) planned for the near future: the leading edge portion of the airfoil will be drooped down dynamically to improve dynamic stall characteristics on the ...
Geißler, W., Dietz, G., Mai, H.
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Analysis of Dynamic Stall using Dynamic Mode Decomposition Technique
31st AIAA Applied Aerodynamics Conference, 2013Dynamic mode decomposition is applied to investigate the unsteady flowfield around a pitching airfoil. The extracted flow structures are termed as dynamic mode decomposition modes. Analyses are performed for both attached flow and dynamic stall cases. Initially, flowfield data generated from numerical simulations are investigated.
Mariappan, Sathesh +3 more
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Modeling three-dimensional dynamic stall
Applied Mathematics and Mechanics, 2011The dynamic stall process in three-dimensional (3D) cases on a rectangular wing undergoing a constant rate ramp-up motion is introduced to provide a qualitative analysis about the onset and development of the stall phenomenon. Based on the enhanced understanding of the mechanism of dynamic stalls, a 3D dynamic stall model is constructed with the ...
Chao Lü, Tong-guang Wang
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Some Measurements on Dynamic Stall
Journal of Aircraft, 1974Details of a flow oscillation device and of force and moment measurements on a 2 ft chord twodimensional NACA 0012-64 airfoil in the oscillating flow and oscillated in pitch in a steady flow through stall are presented. Results indicate that both methods give essentially the same description of the dynamic stall process.
A. G. Parker, J. Bicknell
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Adaptive Airfoil Dynamic Stall Control
43rd AIAA Aerospace Sciences Meeting and Exhibit, 2005The purpose of this study was to investigate an adaptive airfoil design to alleviate, or greatly reduce, the negative effects of dynamic stall on rotorcraft blades. The adaptive airfoil design uses compliant structures technology to design an aerodynamically smooth, variable droop leading edge for airfoil dynamic stall control.
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Thick Airfoil Deep Dynamic Stall
2014Recent interest in vertical axis wind turbines (VAWTs) has surged due to their appearance in the built environment and their potential for deep water offshore applications. Their well-known advantages include insensitivity to the wind direction, proximity of the generator to the ground and relatively low noise levels.
Hans Mueller-Vahl +4 more
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Dynamic stall model for wind turbine airfoils
Journal of Fluids and Structures, 2007A model is presented for aerodynamic lift of wind turbine profiles under dynamic stall. The model combines memory delay effects under attached flow with reduced lift due to flow separation under dynamic stall conditions. The model is based on a backbone curve in the form of the static lift as a function of the angle of attack.
Larsen, Jesper Winther +2 more
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Compressible studies on dynamic stall
27th Aerospace Sciences Meeting, 1989The purpose of this work is to investigate the effects of compressibility on the dynamic stall phenomenon by numerical simulation of the unsteady flow. The full two-dimensional unsteady compressible Navier-Stokes equations are solved for flows over oscillating airfoils and airfoils pitching rapidly to high angles of attack.
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