Results 21 to 30 of about 105,600 (307)
Separation Control on Oscillating Airfoils Using Moving Surface Control
NUST Journal of Engineering Sciences, 2008 A numerical investigation has been conducted to study the effectiveness of Moving Surface Control method in controlling dynamic stall in oscillating airfoils.
S. R. Sheikh, Omar A. Qazi
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The dynamics and timescales of static stall
Journal of Fluids and Structures, 2021 Airfoil stall plays a central role in the design of safe and efficient lifting surfaces. We typically distinguish between static and dynamic stall based on the unsteady rate of change of an airfoil's angle of attack. Despite the somewhat misleading denotation, the force and flow development of an airfoil undergoing static stall are highly unsteady and ...
Sébastien Le Fouest +2 more
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Study on Dynamic Stall Control of Rotor Airfoil Based on Coflow Jet
International Journal of Aerospace Engineering, 2020 In this study, a dynamic stall control strategy, called the co-flow jet (CFJ), is applied to the rotor airfoil. The effect of the CFJ on the unsteady dynamic stall characteristics of the rotor airfoil is numerically investigated via numerical simulations
Jiaqi Liu +4 more
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Numerical simulation study on dynamic stall of airfoil controlled by combined blow-suction
Hangkong gongcheng jinzhan, 2023 One of the key problems to improve the aerodynamic characteristics of airfoil is to solve the dynamic stall.This paper presents a method to control the dynamic stall of airfoil by using the combination of leading-edge suction and trailing edge suction ...
JIA Tianhao +3 more
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Experimental and numerical study on dynamic stall under a large Reynolds number
Advances in Aerodynamics, 2023 Dynamic stall under large Reynolds numbers and large reduced frequencies has a significant effect on the performance of the wind turbine blades, helicopter rotors, etc. So the dynamic stall physics of the NACA0012 airfoil under a large Reynolds number of
Binbin Wei, Yongwei Gao, Shuling Hu
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Experimental Study on Dynamic Stall of Airfoil in Rotor Reverse Flow Region
Aerospace, 2023 The large reverse flow region of the rotor with a high advance ratio is an important factor that affects the performance improvement of helicopters. This paper examines the dynamic stall of the airfoil in the reverse flow region of the rotor to develop a
Weihong Kong, You Li
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Dynamic stall measurements on airfoils [PDF]
PAMM, 2007 AbstractWe present a new method for measuring the lift forces acting on an airfoil segment under dynamic stall conditions. Thereby the pressure distribution over the wind tunnel walls is detected by an adequate number of pressure sensors. The airfoil is rotated by a stepping motor with angular velocities up to 300°/s.
Gerrit Wolken‐Möhlmann +2 more
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Energies, 2020 Passive vortex generators (VGs) have been widely applied on wind turbines to boost the aerodynamic performance. Although VGs can delay the onset of static stall, the effect of VGs on dynamic stall is still incompletely understood.
Chengyong Zhu +3 more
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Cartographing dynamic stall with machine learning [PDF]
Wind Energy Science, 2020 Once stall has set in, lift collapses, drag increases and then both of these forces will fluctuate strongly. The result is higher fatigue loads and lower energy yield. In dynamic stall, separation first develops from the trailing edge up the leading edge.
M. Lennie +3 more
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Dynamic stall control over a rotor airfoil based on AC DBD plasma actuation
Advances in Aerodynamics, 2021 At present, the control capability of dielectric barrier discharge (DBD) plasma actuation covers the flow velocity range of helicopter’s retreating blades, so it is necessary to extend it to the dynamic stall control of rotor airfoils.
Guangyin Zhao +4 more
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