Results 261 to 270 of about 105,600 (307)
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Dynamic Stall and Aerodynamic Damping
Journal of Solar Energy Engineering, 1998Riso̸ has developed a dynamic stall model that is used to analyze and reproduce open air blade section measurements as well as wind tunnel measurements. The dynamic stall model takes variations in both angle of attack and flow velocity into account. The paper gives a brief description of the dynamic stall model and presents results from analyses of ...
Flemming Rasmussen +2 more
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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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On the Mechanism of Dynamic Stall
Journal of the American Helicopter Society, 1972The sequence of events comprising dynamic stall of an airfoil is discussed, with emphasis on the role of the leading edge laminar separation bubble and shed vortex. A simple bubble model, based on a combination of theoretical and experimental investigations, is used to discuss the events prior to the shedding of the vortex, and provides the basis for ...
Wayne Johnson, Norman D. Ham
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Competing Mechanisms of Compressible Dynamic Stall
AIAA Journal, 1998Earlier experiments have documented the onset of compressible dynamic stall either from the bursting of a leading-edge laminar separation bubble or from a leading-edge shock, depending on the Reynolds number and Mach number. For certain combinations of conditions, the supersonic flow and the bubble dynamics compete with each other.
Chandrasekhara, M.S. +2 more
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An assessment of the impact of compressibility on dynamic stall
33rd Aerospace Sciences Meeting and Exhibit, 1995ARO-MIPR-125 ...
Carr, L.W., Chandrasekhara, M.S.
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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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Aeronautical Quarterly, 1982
SummaryThe unsteady breakdown or stall of streamlined flow near the rounded leading edge of an aerofoil, as the small angle of attack is raised above its critical stall value, is studied theoretically for large Reynolds number motion. The unsteady developments take place first over a relatively slow time scale but then the corresponding solution breaks
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SummaryThe unsteady breakdown or stall of streamlined flow near the rounded leading edge of an aerofoil, as the small angle of attack is raised above its critical stall value, is studied theoretically for large Reynolds number motion. The unsteady developments take place first over a relatively slow time scale but then the corresponding solution breaks
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Effects of compressibility on dynamic stall
AIAA Journal, 1991In this paper, typical computational predictions and experimental measurements of compressible flow past an airfoil at dynamic stall conditions are studied and compared to develop an insight into the effect of compressibility on dynamic stall. The dependency of the critical Mach number on airfoil leading edge curvature, camber, and angle of attack is ...
K.-Y. Fung, L. W. Carr
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The effects of compressibility on dynamic stall
1st National Fluid Dynamics Conference, 1988In this paper, typical computational predictions and experimental measurements of compressible flow past an airfoil at dynamic stall conditions are studied and compared to develop an insight into the effect of compressibility on dynamic stall. The dependency of the critical Mach number on airfoil leading edge curvature, camber, and angle of attack is ...
K.-Y. FUNG, L. CARR
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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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