Synthetic jet application on a flapping airfoil

Download
index.pdf
2014
Çiftci, Meltem
Show full item record
84
views
96
downloads
In this study, an active flow control method is studied numerically by the application of synthetic jet over SD7003 airfoil. Steady and unsteady flows over the airfoil are computed by using a Navier-Stokes solver. k-ω SST turbulence model is employed for the investigation of the jet parameters at various angles of attacks and Reynolds numbers. The effect of the jet velocity and the jet angle are investigated to increase the lift to drag ratio. The jet slot size and the jet location are kept constant during the parametric study of the jet application. The parametric study has shown that the jet velocity is the dominant variable. Moreover, it is observed that the application of jet delays the flow separation on the suction side of the airfoil and increases the lift to drag ratio significantly at stall angles of attack. However, for attached flows, application of the jet is observed to be less effective. Unsteady flow conditions are employed in hover mode. The effect of zero-net-mass-flux, vertical translation, Reynolds number and the synthetic jet frequency are studied in figure-of-eight motion. In spite of steady state flow conditions, it is observed that the application of synthetic jet causes a slight decrease on mean lift to drag ratio. Increase of the vertical translation amplitude increases the picks and deeps on instantaneous aerodynamic forces. In addition, it is observed that the synthetic jet frequency do not alter significantly the instantaneous aerodynamic forces for the given figure-of-eight motion.
Aerofoils., Aerodynamics., Airplanes, Micro air vehicles.
http://etd.lib.metu.edu.tr/upload/12617531/index.pdf
https://hdl.handle.net/11511/23722
Graduate School of Natural and Applied Sciences, Thesis

Suggestions

Numerical investigation of flow control over an airfoil with synthetic jets and its optimization
Akçayöz, Eray; Tuncer, İsmail Hakkı; Department of Aerospace Engineering (2008)
In this work, an active flow control method is studied numerically by using a synthetic jet over a NACA 0015 airfoil. Unsteady, turbulent flows over the NACA 0015 airfoil are computed using a Navier-Stokes solver. The Spalart-Allmaras turbulence model is employed in all computations. Unsteady flow solutions are computed in parallel using Parallel Virtual Machine library routines in a computer cluster. The synthetic jet is implemented to the flow solver as a boundary condition. Response Surface Methodology i...
Application of spring analogy mesh deformation technique in airfoil design optimization
Yang, Yosheph; Özgen, Serkan; Department of Aerospace Engineering (2015)
In this thesis, an airfoil design optimization with Computational Fluid Dynamics (CFD) analysis combined with mesh deformation method is elaborated in detail. The mesh deformation technique is conducted based on spring analogy method. Several improvements and modifications are addressed during the implementation of this method. These enhancements are made so that good quality of the mesh can still be maintained and robustness of the solution can be achieved. The capability of mesh deformation is verified by...
2D and 3D CFD investigation of NREL S826 airfoil at low reynolds numbers
Türkal, Mert; Novikov, Yaroslav; Üşenmez, Serdar; Sezer Uzol, Nilay; Uzol, Oğuz (null; 2014-06-20)
In this study CFD investigation of flow over the NREL S826 airfoil is performed. NREL S826 airfoil was designed for HAWTs of 10-15 meter diameters. However, it is used in the NTNU wind turbine rotor model and low Reynolds number flow characteristics become important in the validations with the test cases of this rotor model. The airfoil CFD simulations are carried out in 2-D and 3-D computational domains. The k-rn SST turbulence model with Langtry-Menter (γ-Reθ) transition prediction model for turbulence cl...
Seismic performance of chevron braced steel frames with and without viscous fluid dampers as a function of ground motion and damper characteristics
Dicleli, Murat (Elsevier BV, 2007-08-01)
This study is aimed at comparing the seismic performance of steel chevron braced frames (CBFs) with and without viscous fluid dampers (VFDs) as a function of the intensity and frequency characteristics of the ground motion and VFD parameters. For this purpose, comparative nonlinear time history (NLTH) analyses of single and multiple story CBFs with and without VFDs are conducted using ground motions with various frequency characteristics scaled to represent small, moderate and large intensity earthquakes. A...
Aerodynamic analysis of flatback airfoils using vortex particle method
Haser, Senem Ayşe; Uzol, Oğuz; Department of Aerospace Engineering (2014)
In this thesis, aerodynamic analysis of flatback airfoils, which have been proposed and investigated to improve the aerodynamic performance of thick airfoils, is studied. Vortex particle method, which is commonly used for simulation of two dimensional, incompressible, viscous flows, is used for this purpose. In the content of this thesis, vortex particle method code developed by Kaya [1] is improved by changing method of diffusion and method of vorticity releasing from solid boundary. Deterministic Particle...
Citation Formats
M. Çiftci, “Synthetic jet application on a flapping airfoil,” M.S. - Master of Science, Middle East Technical University, 2014.
METU IIS - Integrated Information Service open@metu.edu.tr