Numerical Simulation of Flow and Heat in Gas Turbine Exhaust Diffuser

摘要

Exhaust diffuser is an important member of the turbo machines. This equipment recovers static pressure by reducing the flow rate in gas turbines that increase the pressure ratio, output work and efficiency of the turbine. This study aims to simulate the fluid flow and heat transfer of the exhaust gas from the turbine and also metal parts of the liner and diffuser because the factors affecting the destruction in the gas turbine exhaust system liners and diffusers are temperature, flow rate and high pressure of the flow passing on them. Reduced lifetime of materials and the creation and growth of cracks in the liner and diffuser are harmful effects of the fluid flow. Therefore, the temperature distribution in the fluid and surface of the liner and diffuser, the form of swirls, turbulence and velocity vectors have been investigated by extracting the graphs of temperature, pressure and speed in different areas, so that the results can be used for optimization purposes of these systems in the future studies.