Heat Transfer and Thermal Mechanical Stress Distributions in Gas Turbine Blades
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In this paper the distributions of heat transfer and thermal mechanical stress in the metal blade surface are investigated. The stream that surrounds the blade was considered at the time that the cooling airflow runs through the blade interior. Cooling channel flow and gases were simulated using a finite volume program, Fluent. The conjugate problem was addressed using coupled domains solid-fluid. Beside the numerical approach, measurements of metal blade surface temperature distributions based on the temperature sensitive paint technique, TSP, were conducted. The cooling effectiveness was compared showing good agreement between computational/experimental results. Additionally to laboratory conditions, finite volume results were obtained for real engine operating conditions. These results were used to establish temperature boundary conditions into a second computational model programmed in ANSYS, based on finite elements. This second model allowed calculating the distribution of thermo-mechanical stress in the blade material. The results show the temperature distribution in the blade surface. Based on this, the heat transfer rate was calculated finding it as a strong function of position. The cooling effectiveness was also calculated, which in turn performs with less variation over the sections of the blade under investigation. Following, the thermal effects in the metal blade surface lead to calculate the stress distribution. Differences in stresses magnitude were also found, suggesting a strong correlation between heat transfer and stress in the metal blade surface.
