Detailed Performance Assessment of 16% Blockage Interrupted Ribs at Sixty Degree Inclination in a Square Section Turbine Blade Cooling Passage

摘要

Three conventional configurations of 60 degrees inclined, interrupted ribs at 16% blockage were tested using a large-scale model of a cooling passage inside a turbine blade. Transient heat transfer experiments using liquid crystal were used to determine the full distribution of local heat transfer coefficient. Heat transfer data on all gas swept surfaces, including heat transfer level on the roughness elements themselves were obtained and compared with data in the literature. The passage thermal efficiency is also presented using pressure loss measurements. Finally detailed flow field at the end of the ribbed section were measured using a miniature 4-hole pyramid probe and the data are used to interpret the heat transfer results.