The Effects of static aeroelasticity on the performance of two-dimensional converging diverging nozzles

Düzel, Ümran
This thesis analyzes the effects of static aeroelasticity on the performance of two dimensional converging diverging nozzles. A Flow analysis is conducted on five different configurations of two dimensional converging-diverging nozzles. Computational study is validated with experimental data. Two of the configurations, which have the same throat area, throat radius, and convergence angle and total nozzle length, are selected as the baseline geometries. By modifying throat radius and keeping all other geometric parameters to be the same, three more configurations are obtained so that throat contouring can be examined as well. Flow analyses are performed by using FLUENT flow solver software. By considering nozzle walls as flexible structure, a static aeroelastic model is implemented. Stiffness, coordinate system transformation, force vector matrices have been obtained for structural model. The flexible wall implementation uses two-dimensional linear beam model. The results of flexible and rigid walls are compared for different nozzle thicknesses. Axisymmetric cases are added to the model to present the differences


The computer simulation of the internal friction peaks associated with the oscillation of geometric kinks along the nonscrew dislocation in the atmosphere of nonlinear power dissipating interstitials
Oğurtanı, Tarık Ömer; Seeger, A (AIP Publishing, 1989-6-15)
The effects of the nonlinear power dissipation on the strength and the position of the cold‐work internal friction peaks associated with the oscillation of geometric kinks in the atmosphere of paraelastic interstitials have been investigated by the novel numerical study of the related mathematical macromodel. The present macroscopic model of internal friction is described by a second‐order ordinary differential equation with a nonlinear Debye‐type dissipative drag term. This system shows not only dissipativ...
The effects of non-universal extra dimensions on the fermion electric dipole moments in the two Higgs doublet model
Iltan, EO (Springer Science and Business Media LLC, 2004-04-01)
We study the the effects of non-universal extra dimensions on the electric dipole moments of fermions in the two Higgs doublet model. We observe that the t quark and b quark electric dipole moments are sensitive to the extra dimensions, however, in the case of charged lepton electric dipole moments, this sensitivity is relatively weak.
The aerodynamic effects of blade pitch angle on small horizontal axis wind turbines
Kaya, Mehmet Numan; Uzol, Oğuz; Ingham, Derek; Köse, Faruk; Buyukzeren, Riza (2022-01-01)
© 2022, Emerald Publishing Limited.Purpose: The purpose of this paper is to thoroughly investigate the aerodynamic effects of blade pitch angle on small scaled horizontal axis wind turbines (HAWTs) using computational fluid dynamics (CFD) method to find out the sophisticated effects on the flow phenomena and power performance. Design/methodology/approach: A small HAWT is used as a reference to validate the model and examine the aerodynamic effects. The blade pitch angle was varied between +2 and −6 degrees,...
The effect of substitutional impurities on the evolution of FeAl diffusion layer
Akdeniz, Mahmut Vedat; Mehrabov, Amdulla (Elsevier BV, 1998-2-13)
The formation and growth characteristics of Fe based aluminide diffusion layers at the Fe-Al interface have been analysed in terms of interfacial interaction potentials based on the statistico-thermodynamical theory of multicomponent alloys combined with electronic theory in the pseudopotential approximation. The pairwise interatomic interaction potentials and partial ordering energies have been calculated to predict the effect of various alloying additions on the activity coefficient of Al atoms in α-Fe0.9...
BILIKMEN, S; NAZIH, RM (IOP Publishing, 1993-02-01)
In this paper, a nonlinear analytical solution for a cold plasma-bunched beam system based on the Hamiltonian formalism where alpha = n(b)/n0 and beta(phi) = upsilon(phi)/c have been taken as parameters matching between zero and unity is given. The oscillation limiting energies, frequencies and transformer ratios have been carried out in general for both the one-dimensional and the case where a small transverse component of motion is included. The plasma wakefield accelerator has been treated as a special c...
Citation Formats
Ü. Düzel, “The Effects of static aeroelasticity on the performance of two-dimensional converging diverging nozzles,” M.S. - Master of Science, Middle East Technical University, 2014.