...Weiguo Ai; Nathan Murray; Thomas H. Fletcher; Spencer Harding; Jeffrey P. Bons Particulate deposition experiments were performed in a turbine accelerated deposition facility to examine the nature of flyash deposits near film cooling holes. Deposition on both bare metal and thermal barrier coating...

... at 1180 ° C and 180 m/s ( M = 0.25 ) . Both cylindrical and shaped holes, with and without thermal barrier coating, were studied over a range of blowing ratios from 0.5 to 4.0. Coolant density ratios were maintained at values from 2.1 to 2.4. Deposition patterns generated with the cylindrical film cooling...

... for the model was matched to that for operational engine conditions, ensuring that the normalized wall temperature, i.e., the overall effectiveness, was matched to that for the engine. Measurements of overall effectiveness were made for models with and without thermal barrier coating (TBC) at various operating...

...Yiping Lu; Alok Dhungel; Srinath V. Ekkad; Ronald S. Bunker Film cooling performance is studied for cylindrical holes embedded in craters. Different crater geometries are considered for a typical crater depth. Cratered holes may occur when blades are coated with thermal barrier coating layers...

... high-pressure turbine ( T = 1150 ° C , M = 0.31 ). The combustor exit flow is seeded with dust particulate that would typically be ingested by a large utility power plant. The three coupon surface treatments included: (1) bare polished metal; (2) polished thermal barrier coating with bondcoat; and (3...

...Jeffrey P. Bons; James E. Wammack; Jared Crosby; Daniel Fletcher; Thomas H. Fletcher A thermal barrier coating (TBC)-coated turbine blade coupon was exposed to successive deposition in an accelerated deposition facility simulating flow conditions at the inlet to a first stage high pressure turbine...

... In this study cooled plates composed of three material layers are investigated. Their substrate layer is made of superalloy CMSX-4 with a thickness of 2.0 mm (Fig. 2 ). The bondcoat consists of a MCrAlY layer ( 0.15 mm thick). The thermal barrier coating (TBC) is an yttrium...

... a large-scale turbine vane cascade in which the following effects on film cooling adiabatic effectiveness were investigated in the endwall region: the effect of near-hole deposition, the effect of partial film cooling hole blockage, and the effect of spallation of a thermal barrier coating. The results...