پديد آورنده :
وفايي رستمي، محمدجواد
عنوان :
بررسي عددي جريان مغشوش حول يك ايرفويل تحت نوسان انتقالي و پيچشي
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
تبديل انرژي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك
صفحه شمار :
نه، 72، [II] ص.: مصور، جدول، نمودار
يادداشت :
ص. ع. به فارسي و انگليسي
استاد راهنما :
محسن ثقفيان
توصيفگر ها :
رينولدز , معادله مونتوم , ايرفويل ساكن
تاريخ نمايه سازي :
1/7/86
استاد داور :
ابراهيم شيراني، احمد رضا پيشه ور
تاريخ ورود اطلاعات :
1396/02/24
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
AbstractIn this numerical study unsteady and icompressible turbulent flows have beenconsidered around stationary and oscillatory airfoils Overser grid technique is used inthis work Three turbulence models have been examined including the linear launder sharma k model non linear craft launder suga k model and non linear lien chen leschziner k model the two dimensional incompressible governingequations are solved using a finite volume discretization technique First the flow field around a stationary airfoil is solved for validating purposes Result indicate different capabilities of capturing sepration angle of attack using linearand non linear models Non linear models predict smaller stall angle compared withthe linear method Turbulence may be exagerated within the sepration zone and it hasoverestimated turbulence levels in the boundary layer Second the flow field around an oscillatory airfoil is considered and the effect of theamplitude of oscillation the frequency and the angle of attack are investigated Comparing with experiments it is obvious that the airodynamic forces and momentare not only a function of the incidence angle but also is dependent to oscillatoryquantities The values of the airdynamics forces are also oscillatory around the valuesobtained for the stationary airfoil these forces are increased decreased when the airfoilmoves upward downward This is due to added mass or added inertia this istherefore the airfoil fluctuations will cause variation of forces and moment byaltering the location of sepration zone Third an airfoil under pitching oscillatons are considered The effect of initial angleof attack the average angle of attack and the frequency of oscillations areinvestigated For this case the result are not satisfactory probably due to inappropriateturbulence models employed
استاد راهنما :
محسن ثقفيان
استاد داور :
ابراهيم شيراني، احمد رضا پيشه ور
