8669

8050

كارشناسي ارشد

تبديل انرژي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك

1392

پانزده،72ص.: مصور،جدول،نودار(رنگي)

ص.ع.به فارسي و انگليسي

مهدي نيلي احمدآبادي، ابراهيم شيراني

عباس قائي

19/1/93

محسن ثقفيان، احمد صداقت

مهندسي مكانيك

ID8050

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Inverse Design of Airfoil Using Elastic Surface Method in Viscous Subsonic and Transonic Flow Regimes Maryam Safari Maryam safari@me iut ac ir Date of Submission 2014 01 7 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisors Mahdi Nili Ahmadabadi m nili@cc iut ac ir Ebrahim Shirani eshirani@cc iut ac irAbstractThe purpose of inverse design is to achieve a particular shape so that the resultant shape satisfies the targetpressure distribution on its boundaries In this thesis a novel inverse design algorithm called Elastic SurfaceAlgorithm ESA is presented for airfoil shape design in subsonic and transonic flow regimes Also flexiblemembrane method MGM is presented in this thesis and this method is compared to elastic surfacealgorithm ESA is a physically based iterative inverse design method including two parts an efficient inversedesign algorithm called elastic surface algorithm and a 2D flow analysis code In this thesis two flowsolvers are used 1 an inviscid flow analysis code in which the Euler equations are solved using theadvection upstream splitting method AUSM for flow field analysis 2 Fluent software In the proposed method the airfoil wall shape is changed under a physical algorithm based on thedeformation of a flexible beam The difference between the target and current pressure distributions causesto deform the flexible beam at each shape modification step Having achieved to the target shape thedifference between the target and current pressure distribution vanishes and finally the beam deformation isstopped and then the internal stresses are set to zero This method is based on the finite elementformulation and can be used to design and optimize the airfoils shape In this investigation various airfoils in subsonic and transonic flow regimes are validated by this method which show the robustness of the method in flow regime with separation and normal shock Also somedesign examples in subsonic and transonic regimes are presented here which show the flexibility of theproposed method Moreover the convergence rate of the method is compared to MGM and BSA methods which shows ESAconsiderably increases the convergence rate in transonic flow regimes Hence ESA is a Powerful techniquefor airfoil design in transonic regime One of the advantages of the presented method is a physical andquick converging approach and can efficiently utilize flow analysis codes as a black box Despitemathematical based methods such as MGM that require arbitrary choice of parameters the beamcharacteristics such as thickness elastic modulus shear modulus etc control the solution stability in ESA Therefore the proper choice of them increases the convergence rate of the design process Keywords Inverse Design Airfoil Elastic Surface Algorithm Viscous and Invicid Flow Regime

مهدي نيلي احمدآبادي، ابراهيم شيراني

عباس قائي

محسن ثقفيان، احمد صداقت