Results 201 to 210 of about 4,618,854 (237)
Some of the next articles are maybe not open access.
A Phenomenological Model of Dynamic Stall
SAE Technical Paper Series, 2002<div class="htmlview paragraph">Dynamic stall has been the subject of much research but there is still some uncertainty about several aspects. Almost all research to date has involved experiments or computational fluid dynamics, both, in essence, trying to duplicate the phenomena. The present research takes a different tack by trying to develop a
openaire +1 more source
An improved dynamic stall model and its effect on wind turbine fatigue load prediction
, 2020Due to the nature of the atmospheric boundary layer, large Horizontal-Axis Wind Turbines (HAWTs) generally operate in highly unstable environment, leading to nonstationary loads on HAWT structures.
Xiong Liu +4 more
semanticscholar +1 more source
Toward dynamic separation without dynamic stall
Experiments in Fluids, 1988The concept of vorticity separation without dynamic stall is illustrated by flow visualization. A small airfoil with a rotating nose, originally built for the demonstration of static stall control, was placed in a wind tunnel and dynamically pitched. The flow around the airfoil during pitch was successfully visualized and filmed.
P. Freymuth, S. Jackson, W. Bank
openaire +1 more source
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
openaire +2 more sources
, 2020
A modified Leishman–Beddoes (Leishman and Beddoes, 1989) model is proposed to predict the aerodynamic load responses of airfoils undergoing dynamic stall at low Reynolds, low Mach numbers and low to very high equivalent reduced pitch rates.
J. Boutet, G. Dimitriadis, X. Amandolese
semanticscholar +1 more source
A modified Leishman–Beddoes (Leishman and Beddoes, 1989) model is proposed to predict the aerodynamic load responses of airfoils undergoing dynamic stall at low Reynolds, low Mach numbers and low to very high equivalent reduced pitch rates.
J. Boutet, G. Dimitriadis, X. Amandolese
semanticscholar +1 more source
, 2019
Passive vortex generators (VGs) have been extensively used on wind turbine airfoils to delay the onset of static stall and improve the aerodynamic performance. Dynamic stall control via passive VGs, however, is still poorly understood.
Chengyong Zhu +3 more
semanticscholar +1 more source
Passive vortex generators (VGs) have been extensively used on wind turbine airfoils to delay the onset of static stall and improve the aerodynamic performance. Dynamic stall control via passive VGs, however, is still poorly understood.
Chengyong Zhu +3 more
semanticscholar +1 more source
Control of Compressible Dynamics Stall Using Microjets
Volume 2: Symposia, Parts A, B, and C, 2003Control of the dynamic stall process of an NACA 0015 airfoil undergoing periodic pitching motion is investigated experimentally in a high-speed wind tunnel facility. Multiple microjet nozzles distributed uniformly in the first 15% chord from the airfoil’s leading edge are used for the control. Point Diffraction Interferometry (PDI) technique is used to
Shih, C. +3 more
openaire +2 more sources
A computational study on the dynamic stall of a flapping airfoil
16th AIAA Applied Aerodynamics Conference, 1998The dynamic stall boundaries of a NACA 0012 airfoil oscillating in either the pure plunge mode or in the combined pitch and plunge mode is computed using a thin-layer Navier-Stokes solver. Unsteady flowfields are computed at the free-stream Mach number of 0.3, the Reynolds number of 1 • 10, and the Baldwin-Lomax turbulence model is employed.
Tuncer, Ismail +2 more
openaire +2 more sources
Simulation of the Dynamic Stall at Low Reynolds Number
48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, 2010In the present paper, a numerical analysis of the two dimensional dynamic stall at low Reynolds number is discussed. The dynamic stall is an important fluid dynamic phenomenon occurring in various technological fields. In particular, the dynamic stall at low Reynolds number is of special interest for specific aerodynamic applications, such as for the ...
C. Marongiu, TOGNACCINI, RENATO
openaire +2 more sources
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.
openaire +1 more source