پديد آورنده :
كاظم زاده، رضا
عنوان :
طراحي چيدمان غيريكنواخت منفذهاي بيضي شكل جهت خنك‌كاري لايه‌اي يك صفحه تخت
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
تبديل انرژي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك
صفحه شمار :
هفده، ۹۵ص.: مصور، جدول، عكس(رنگي)، نمودار
استاد راهنما :
محمدرضا سليم پور
استاد مشاور :
محمدرضا توكلي
توصيفگر ها :
توربين گاز , خنك‌كاري لايه‌اي , منفذهاي بيضي شكل , نسبت دمش , اثربخشي , تنش فون‌ميسز
استاد داور :
احمد صابونچي، علي اكبر عالم رجبي
تاريخ ورود اطلاعات :
1396/10/18
چكيده انگليسي :
96 Non uniform Arrangment design of elliptical holes for film cooling of a flat plate Reza Kazemzadeh r kazemzadeh@me iut ac ir Date of Submission 2014 01 20 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Mohammad Reza Salimpour Salimpour@cc iut ac irAbstract Gas turbines are used in jet engines power plants and other industrial applications In jet engines increasing the pressure ratio of the compressor and inlet temperature of the gas turbine are two majormethods for increasing the efficiency and output of the motor In modern gas turbines in order to increaseefficiency the hot gas temperature usually enters the high pressure turbine at the melting temperature of thealloys used in the manufacturing of the turbine blades Along with the advances in metallurgy one of themost common methods for retaining blades and the body of the combustion chamber is using film cooling in which a layer of cooling flow between the surface and the passing hot gas is formed so that the hot gasoutput from t com ust on c m r t t nt rs t tur n o sn t m t l T ov r ll purposof the project is to design a non uniform Arrangment of elliptical holes for film cooling on a flat plate thatthe optimum distance between the rows of holes can optimize the effectiveness of the film cooling In thefilm cooling as the layer of the cross section of the cooling hole is more stretched out due to reducedmomentum and better surface coating the effectiveness increases For this purpose two types of coolingholes with elliptic of type II a b 2 and type III a b 3 have been used in this project Due to the constantmain flow rate with increasing of blow ratio M the velocity of the cooling fluid increases and as a result the vertical momentum of the cooling fluid increases By increasing the blowing ratio to a limit the coolantfluid separates from the surface and penetrates the mainstream and reduces its effectiveness Therefore thecenterline and laterally averaged effectiveness diagrams for different blowing ratios were plotted and thehighest effectiveness was reported in optimum blow ratio M 0 75 In the cooling of the plate by tworows of elliptical holes as the second row gets closer to the first row of holes because it covers the distance width between the first row of holes the effectiveness increases On the other hand because of the lowdistance between the first and second rows the maximum of Von Mises stress is higher than the otherconfiguration In contrast to the previous configuration in cooling by three rows of elliptical cross sectionalcooling by increasing the distance of the second and third row at an optimum distance the effectiveness isincreased and the maximum Von Mises stress is reduced Keywords Gas turbine Film cooling elliptical holes Blowing ratio Effectiveness Von Misesstress
استاد راهنما :
محمدرضا سليم پور
استاد مشاور :
محمدرضا توكلي
استاد داور :
احمد صابونچي، علي اكبر عالم رجبي
