Aerodynamic modelling and optimization of morphing wings

Körpe, Durmuş Sinan
This thesis deals with aerodynamic optimization of morphing wings under performance and geometric constraints. In order to perform the optimization process, flow solvers computing aerodynamic lift and drag were developed as a function evaluator. A gradient based optimization method was used in order to develop the optimization algorithm. Three dimensional panel method solver was developed in order to obtain lift, pressure drag and induced drag values for a finite wing. Obtained results were compared with different solvers. Compared results were in agreement for low to moderate angles of attack. Two dimensional boundary layer solver was developed in order to obtain the skin friction drag for each strip along span. The boundary layer results were compared with another solver for different angle of attack values and agreement in the results was observed at low to moderate angle of attack values. Optimization solver was developed by using the generalized reduced gradient method. A benchmark structural optimization problem was solved by using this solver and results were compared with the results in the literature. Morphing wing optimization process started with a fixed wing optimization problem for a certain cruise velocity at steady level flight for the baseline wing. Fixed wing optimization was performed for three cases that are only airfoil shape change, only planform change and combined airfoil shape and planform change. After that it was assumed that materials and mechanisms for morphing that were used for another study in the literature were available and the morphing optimization problem was defined according to them. Similar to fixed wing optimization, the process was performed for only airfoil shape change, only planform change and combined airfoil shape and planform change. The optimization problem was solved for velocities less and greater than the cruise velocity and drag polar curve of the morphing wing was obtained. According to the results, remarkable drag reductions were obtained that is expected from a morphing wing. Nevertheless, drag reductions obtained with only planform morphing are significantly higher than those obtained with only airfoil shape morphing.


Measurement of lift and drag in morphing wings using a high precision load cell
Özkanaktı, Mehmet Harun; Özgen, Serkan; Department of Aerospace Engineering (2015)
This thesis focuses on computational and experimental investigation of three different morphing wing planforms and a baseline wing planform using a commercial CFD software and load cell measurements for the validation of an optimization code developed in a separate study. The wing planforms of interest originate from an optimization tool that minimizes drag for a constant value of lift at a given velocity. The first planform of interest is the planform for optimized drag subject to 14 m/s freestream velocit...
Şekil değiştirebilen kanatların aerodinamik açıdan kısıtlı en iyileştirilmesi
Körpe, Sinan Durmuş; Özgen, Serkan; Özkanaktı, Harun; Özçakmak, Sinem Özge(2015)
Bu proje, performans ve geometrik kısıtlamalar altında şekil değiştirebilen kanatların aerodinamik eniyilemesi ve elde edilen aerodinamik sonuçların rüzgar tüneli testleri ile doğrulanması ile ilgilidir. Eniyileme hesaplamaları için, aerodinamik kaldırma ve sürükleme değerlerini hesaplayan akış çözücüleri geliştirilmiştir. Eniyileme çözücüsünü geliştirmek için, gradyan temelli bir eniyileme metodu kullanılmıştır. Geliştirilen çözücülerin sonuçları literatürde bulunan sonuçlarla karşılaştırılmış ve sonuçları...
Aerodynamic shape optimization of wind turbine blades using a 2-D panel method with a boundary layer solver and a Genetic Algorithm
Polat, Ozge; Sezer-uzol, Nilay; Tuncer, İsmail Hakkı (null; 2012-12-01)
This paper presents an aerodynamic shape optimization methodology for rotor blades of horizontal axis wind turbines. Genetic Algorithm and Blade Element Momentum (BEM) Theory are implemented for maximization of the power production at a given wind speed, rotor speed and rotor diameter. The potential flow solver with a boundary layer model, XFOIL, provides sectional aerodynamic loads. Optimization variables are selected as the sectional chord length, the sectional twist and the blade profiles at root, mid an...
Synthesis, analysis and design of a novel mechanism for the trailing edge of a morphing wing
Şahin, Harun Levent; Yaman, Yavuz; Department of Aerospace Engineering (2018)
In this thesis, synthesis, analysis and design of a novel scissor-structural mechanism (SSM) with a four-bar (FB) linkage for the trailing edge of a morphing wing has been presented. The SSM, which is deployable, is created via combination of various scissor-like elements (SLEs). In order to provide mobility requirements, a FB linkage is assembled to the proposed SSM. The FB linkage is synthesized and optimized in order to give the structure required torque with a complete rotation. The SSM is designed with...
Textile supercapacitors-based on MnO2/SWNT/conducting polymer ternary composites
Yuksel, Recep; Ünalan, Hüsnü Emrah (2015-12-01)
This paper describes a simple and fast process for the fabrication of flexible and textile-based supercapacitors. Symmetric electrodes made up of binder-free ternary composites of manganese oxide (MnO2) nanoparticles, single walled carbon nanotubes (SWNT) and a conducting polymer (either polyaniline (PANI) or poly(3,4-ethylenedioxythiophene)-poly( styrenesulfonate) (PEDOT: PSS)) were layer-by-layer deposited onto cotton substrates by dip coating method. Solid-state supercapacitor devices were assembled usin...
Citation Formats
D. S. Körpe, “Aerodynamic modelling and optimization of morphing wings,” Ph.D. - Doctoral Program, Middle East Technical University, 2014.