ANALYSE ET SIMULATION DE REFROIDISSEMENT DES AUBES D'UNE TURBINE A GAZ EN PRESENCE DES TROUS

Abstract

Gas turbines are extensively used for air craft propulsion, land based power generation and industrial applications. Thermal efficiency of gas turbine improved by increasing turbine rotor inlet temperature. The current rotor inlet temperature in advanced gas turbine is for above the melting point of blade material. A sophisticated cooling scheme must be developed for continuous safe operation of gas turbines with high performance. Gas turbines are cooled externally and internally. Several methods have been suggested for the cooling of blades and vanes. The techniques that involve to cool the blades and vanes by using cooling methods is to have radial holes to pass high velocity cooling air along the blade span. In this thesis, a turbine blade is designed and modeled in CATIA v5 software. The turbine blades are designed using cooling holes. The turbine blade is designed with no holes, 4 holes, 8 holes and 12 holes. CFD analysis is done to determine the pressure distribution, velocity, temperature distribution and heat transfer rate by applying the inlet velocities. Thermal and Structural analysis is done to determine the heat transfer rates and strength of the blade. The present used material for blade is chromium steel. In this thesis, it is replaced with Inconel 718 and N-155. The better material for blade is analyzed