9384

8666

كارشناسي ارشد

مكانيك- تبديل انرژي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك

1393

هشت،130ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

مهدي نيلي احمدآبادي، ابراهيم شيراني

1/10/93

احمدرضا پيشه ور، احمد سوهانكار

مهندسي مكانيك

ID8666

Inverse Design of Axial Flow Compressor Blades Using Elastic Surface Algorithm in Subsonic and Transonic Flow Regimes with Separation Mohammad Hossein Noursalehi mh noorsalehi@me iut ac ir Date of Submission 2014 09 22 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 irAbstract Inverse design methods are powerful tools for aerodynamic shape design Inverse design includesdetermining a shape of body so that a prescribed pressure velocity or shear stress distribution is achievedon its surface In this thesis a new inverse design algorithm called Elastic Surface Algorithm ESA isdeveloped and enhanced for axial flow compressor blade design in subsonic and transonic flow regimeswith separation ESA is an iterative inverse design method which includes two parts an efficient inverse designalgorithm called elastic surface algorithm that uses a 2 D nonlinear finite element model and a 2 D flowsolver In this thesis the Fluent commercial software is used as a compressible viscous flow solver In the proposed method the airfoil wall shape is changed under a physical algorithm based on thedeformation of a flexible beam The difference between target and current pressure distributions and thedifference between target and current wall shear stress distributions cause to deform the flexible beam ateach shape modification step and then the internal stresses are set to zero When current pressure and wallshear stress distributions converge to the target ones the deformation of airfoil walls is stopped and thefinal airfoil shape is achieved In this investigation the rotor and stator blades of the first stage of an axial flow compressor in subsonicand transonic flow regimes are validated by the enhanced ESA which shows the robustness of the methodin flow regime with separation and normal shock Also some algorithms are developed to improve theperformance of this method for compressor blade designs Moreover some design examples of axial flowcompressor blades in subsonic and transonic viscous regimes are presented here which show the flexibilityof the proposed method Results show that the enhanced Elastic Surface Algorithm is a powerful tool for considering thetransonic flow around airfoils The other advantages of the presented method is its physical approach highconvergence rate and the high ability to utilize computer codes as a black box for flow analysis Keywords Inverse Design Airfoil Axial Flow Compressor Blade Elastic Surface ViscousFlow Regime Wall Shear Stress

مهدي نيلي احمدآبادي، ابراهيم شيراني

احمدرضا پيشه ور، احمد سوهانكار