Journal ArticleDOI
Vortex Trapping by Different Cavities on an Airfoil
Aswin Vuddagiri,Abdus Samad +1 more
TLDR
In this paper, the authors presented the flow over an airfoil with different cavity shapes placed on the suction surface of a symmetric airframe, and the cavity with both sharp edges showed better results in terms of lift and drag as compared to other shapes of the cavity.Abstract:
The paper presents the flow over an airfoil with different cavity shapes placed on the suction surface of a symmetric airfoil. Unsteady simulations of flow over the airfoil with and without cavities were performed by Reynolds averaged Navier-Stokes (RANS) solver. Lift and drag were checked and the separation point identified at different Reynolds numbers and different angles of attack. The airfoil with cavity produced more drag and less lift as compared to the airfoil without cavity. The cavity with both sharp edges showed better results in terms of lift and drag as compared to other shapes of the cavity.read more
Citations
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Study of drag reduction using periodic spanwise grooves on incompressible viscous laminar flows
Pooyan Tirandazi,Carlos Hidrovo +1 more
TL;DR: In this article, the authors study periodic, infinitely long spanwise grooves on a laminar boundary layer over a plate for 1000 $R\phantom{\rule{0}{0ex}}{e}_{L}$ 25000 below a certain width-to-depth aspect ratio (AR), a primary vortex inside each groove causes the freestream to slip over, reducing skin friction.
Journal ArticleDOI
The effects of surface modification on aerodynamic characteristics of airfoil DU 06 W 200 at low Reynolds numbers
Omid Zargar,Tee Lin,Andrew Gare Zebua,Ting-Jun Lai,Yang-Cheng Shih,Shih-Cheng Hu,Graham J. Leggett +6 more
TL;DR: In this paper , the flow characteristics and velocity fields over the vertical axis wind turbines DU 06 W 200 airfoil developed by Delft University of Technology and some other innovative designs are examined by computational fluid dynamics (CFD) simulation and particle image velocimetry (PIV) measurements.
Journal ArticleDOI
New Airfoil-Design Concept with Improved Aerodynamic Characteristics
L. Lazauskas,B. K. Kirke +1 more
Journal ArticleDOI
Horizontal axis wind turbines passive flow control methods: a review
Sudhanshu S. Manerikar,Sourabh R. Damkale,Sanjay N. Havaldar,Shubhanga V. Kulkarni,Yash A. Keskar +4 more
Journal ArticleDOI
Simultaneous Effect of Suction and Cavity for Controlling Flow Separation on NACA 0012 Airfoil – CFD Approach
TL;DR: In this article, a Computational Fluid Dynamics (CFD) investigation is carried out for analyzing the simultaneous effect of suction and cavity for controlling flow separation on NACA 0012 airfoil.
References
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Journal ArticleDOI
The control of flow separation by periodic excitation
TL;DR: In this article, a review of the control of flow separation from solid surfaces by periodic excitation is presented, with an emphasis on experimentation relating to hydrodynamic excitation, although acoustic methods as well as traditional boundary layer control, such as steady blowing and suction are discussed in order to provide an appropriate historical context for recent developments.
ReportDOI
Aerodynamic characteristics of seven symmetrical airfoil sections through 180-degree angle of attack for use in aerodynamic analysis of vertical axis wind turbines
R E Sheldahl,P C Klimas +1 more
TL;DR: In this article, a wind tunnel test series was conducted at moderate values of Re in which 0 less than or equal to..cap alpha.. less than and equal to 180/sup 0/ force and moment data were obtained for four symmetrical blade-candidate airfoil sections (NACA-0009, -0012, −0012H, and -0015).
Journal ArticleDOI
On steady laminar flow with closed streamlines at large Reynolds number
TL;DR: In this article, it is shown that if the motion is to be exactly steady there is an integral condition, arising from the existence of viscous forces, which must be satisfied by the vorticity distribution no matter how small the viscosity may be.
Journal ArticleDOI
Dynamics and control of high-reynolds-number flow over open cavities
TL;DR: The effects of high-frequency open-loop forcing, fundamental limitations of feedback control for a given configuration of sensors and actuators, and the development of a feedback design methodology that respects the limited range of validity of the available dynamical models are discussed.
Journal ArticleDOI
An evaluation of RANS turbulence modelling for aerodynamic applications
Pietro Catalano,Marcello Amato +1 more
TL;DR: In this paper, the authors applied the CIRA RANS flow solver by employing a large set of turbulence models, to typical aerodynamic applications for which certified experimental data are available in literature.