5509

5169

كارشناسي ارشد

تبديل انرژي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك

1389

هشت،90ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

محمود اشرفي زاده

ابراهيم شيراني

15/8/89

احمد صداقت، سليم پور

مهندسي مكانيك

ID5169

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Numerical Investigation and Analysis of Turbulence Models for Fluid Flow through Gas Turbine Stator Blades Navid Dabir Moghaddam Navid dabirmoghaddam@yahoo com April 19 2010 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiM Ashrafizaadeh Assist Prof Supervisor mahmud@cc iut ac irAbstractMany researchers have put much attention on gas turbine blades because of their wide applications in industry So having information about the characteristics of fluid flow through gas turbine blades seems to be critical Because of this importance some of the parameters which are effective on simulating fluid flow through gasturbine blades are investigated by the use of CFX software Numerical grid which is one of the investigatedparameters has significant effect on numerical results So grid sensitivity has been investigated as the first step Defining the turbulence model is another important parameter in this project Four turbulence models such asK K SST and RSM are used to predict heat transfer and aerodynamic parameters for C3X stator blade Pressure distribution around the blade was predicted almost identical by the use of different turbulence models But in predicting wall temperature around the blade SST model shows better results comparing to other modelssince it has less than 1 5 percent error comparing to experimental results Also in this project the effect ofdifferent turbulence intensities on aerodynamic and heat transfer characteristics of midspan hub and shroud ofthe stator blade are investigated By increasing turbulence intensity heat transfer rate increases at midspan butdecreases at hub and shroud Viscous work is the last parameter which is analyzed in this project This term existsin energy equation and its effect is significant in high speed flows The analysis shows that this term is moreeffective when turbulence intensity is higher Another object of this project is to investigate the importance ofthese parameters comparing to each other This means that which of these parameters are more important insimulating fluid flow through gas turbine blades Using a good turbulence model is the most important parameterin gas turbine simulation After that turbulence intensity numerical grid and viscous work have lower effects ingas turbine simulation comparing to turbulence model Finally a comparison between different Reynolds StressTurbulence models RSM is investigated in order to find the best one for predicting the fluid flow through gasturbine stator blades The primary difference between these models is the use of or equation The results ofmodels using equation are close to experimental data but SST model shows the best results comparing to allturbulence models used in this project Key WordsTurbulence models turbulence intensity viscous work numerical grid Reynolds Stress Turbulencemodels RSM CFX software

محمود اشرفي زاده

ابراهيم شيراني

احمد صداقت، سليم پور