Results 11 to 20 of about 4,618,854 (237)
A New Stall-Onset Criterion for Low Speed Dynamic-Stall [PDF]
Journal of Solar Energy Engineering, 2005 The Beddoes/Leishman dynamic-stall model has become one of the most popular for the provision of unsteady aerofoil data embedded in much larger codes. The underlying modeling philosophy was that it should be based on the best understanding, or description, of the associated physical phenomena.
Sheng, W. +2 more
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All you need is time to generalise the Goman–Khrabrov dynamic stall model [PDF]
Journal of Fluid Mechanics, 2021 Dynamic stall on airfoils negatively impacts their aerodynamic performance and can lead to structural damage. Accurate prediction and modelling of the dynamic stall loads are crucial for a more robust design of wings and blades that operate under ...
F. Ayancik, K. Mulleners
semanticscholar +2 more sources
Dynamic stall development [PDF]
Experiments in Fluids, 2013 Dynamic stall on an oscillating airfoil was investigated by a combination of surface pressure measurements and time-resolved particle image velocimetry. Following up on previous work on the onset of dynamic stall (Mulleners and Raffel in Exp Fluids 52(3):779–793, 2012), we combined time-resolved imaging with an extensive coherent structure analysis to ...
Mulleners, Karen, Raffel, Markus
core +3 more sources
The onset of dynamic stall revisited [PDF]
Experiments in Fluids, 2011 Dynamic stall on a helicopter rotor blade comprises a series of complex aerodynamic phenomena in response to the unsteady change of the blade’s angle of attack. It is accompanied by a lift overshoot and delayed massive flow separation with respect to static stall. The classical hallmark of the dynamic stall phenomenon is the dynamic stall vortex.
Mulleners, Karen, Raffel, Markus
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Investigations of dynamic stall and dynamic stall control on helicopter airfoils [PDF]
, 2016 Investigations into dynamic stall and dynamic stall control on airfoils are detailed using pitching airfoil experiments and numerical investigations at Mach 0.3, 0.4 and 0.5 on the airfoils EDI-M109, EDI-M112 and OA209. Two-dimensional dynamic stall was investigated, and the effects of the wind tunnel interference, rotation and the finite wing on the ...
Gardner, Anthony D., Gardner, Anthony
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Development of a second-order dynamic stall model [PDF]
Wind Energy Science, 2020 Dynamic stall phenomena carry the risk of negative damping and instability in wind turbine blades. It is crucial to model these phenomena accurately to reduce inaccuracies in predicting design driving (fatigue and extreme) loads. Some of the inaccuracies
N. Adema, M. Kloosterman, G. Schepers
doaj +5 more sources
HAWT performance with dynamic stall [PDF]
, 1986 In this report we calculated the effects of flow nonuniformities (wing shear, tower wake, yaw, and large-scale turbulence) on the performance of a horizontal axis wind turbine, accounting for dynamic stall. We modified the PROP program to incorporate and compare these effects with the uniform flow case.
Hibbs, B. D.
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Detection of vaneless diffuser rotating stall by means of dynamic pressure sensors and acoustic measurements [PDF]
E3S Web of Conferences, 2021 An accurate estimation of rotating stall is one of the key technologies for high-pressure centrifugal compressors. Several techniques have been proposed to detect the stall onset; inter alia, few dynamic pressure probes have been shown to not only ...
Romani Luca +6 more
doaj +1 more source
Applied Sciences, 2020 The dynamic stall characteristics of rotor airfoil are researched by employing unsteady Reynolds-Averaged Navier-Stokes (RANS) method under oscillating freestream velocity conditions.
Qing Wang, Qijun Zhao
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Modeling dynamic loads on oscillating airfoils with emphasis on dynamic stall vortices
Wind Energy, 2021 We present a modified version of the ONERA dynamic stall model for improving the prediction of the unsteady forces and load overshoots generated by the shedding of dynamic stall vortices.
Ayman Mohamed, David H. Wood
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