Results 211 to 220 of about 8,670 (264)

Investigation of dynamic stall onset

Aerospace Science and Technology, 2006
Abstract In a 2003 test campaign in the DLR-VAG test stand unsteady pressure distributions during dynamic stall have been measured on a 2D-wing model with OA312 airfoil section. To investigate the effect of transition on dynamic stall onset different tripping devices have been fixed at the leading edge of the model.
Geissler, Wolfgang, Haselmeyer, Hartmut
exaly   +3 more sources

Influence of Rotation on Dynamic Stall

Journal of the American Helicopter Society, 2013
A computational investigation of the effect of rotation on two-dimensional (2D) deep dynamic stall has been undertaken, showing that the effect of rotation is to reduce the severity of the pitching moment peak and cause earlier reattachment of the flow. A generic single blade rotor geometry was investigated, which had a pitching oscillation around the
Gardner, Anthony Donald, Richter, Kai
openaire   +3 more sources

Dynamic stall simulation problems

Guidance, Control and Flight Mechanics Conference, 1970
Dynamic airfoil stall simulation in wind tunnels, considering pitch rate, Reynolds number, oscillation and test equipment ...
LARS E. ERICSSON, J. PETER REDING
openaire   +1 more source

Evaluating Dynamic Stall-Onset Criteria for Mixed and Trailing-Edge Stall

AIAA Journal, 2022
We evaluate two leading-edge-based dynamic stall-onset criteria (namely, the maximum magnitudes of the leading-edge suction parameter and the boundary enstrophy flux) for mixed and trailing-edge stall. These criteria have been shown to successfully predict the onset of leading-edge stall at Reynolds numbers of [Formula: see text], where the leading ...
Sarasija Sudharsan, Shreyas Narsipur, Anupam Sharma   +2 more
openaire   +1 more source

Compressibility effects on dynamic stall

Progress in Aerospace Sciences, 1996
Abstract Dynamic stall delay of flow over airfoils rapidly pitching past the static stall angle has been studied by many scientists. However, the effect of compressibility on this dynamic stall behavior has been less comprehensively studied. This review presents a detailed assessment of research performed on this subject, including a historical ...
Carr, L.W., Chandrasekhara, M.S.
openaire   +2 more sources

Dynamic Stall and Aerodynamic Damping

Journal of Solar Energy Engineering, 1998
Riso̸ 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, Jorgen Petersen, Helge Madsen   +2 more
openaire   +1 more source

Dynamic stall on a supercritical airfoil

Aerospace Science and Technology, 2005
Summary: 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.
openaire   +3 more sources

On the Mechanism of Dynamic Stall

Journal of the American Helicopter Society, 1972
The 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
openaire   +1 more source

Competing Mechanisms of Compressible Dynamic Stall

AIAA Journal, 1998
Earlier 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., Wilder, M.C., Carr, L.W.   +2 more
openaire   +2 more sources