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- W145468802 abstract "This thesis presents the design, development and testing of a new film cooling holegeometry, the converging slot-hole or console. Both the thermal and aerodynamicperformance were measured, using the adiabatic effectiveness and heat transfercoefficient, and aerodynamic loss respectively, to quantify performance. Comparativemeasurements were made, by testing conventional film cooling hole shapes in parallelwith the console experiments. The CFD code, Fluent, was used to predict the performanceof the initial design concept before it was manufactured.Initial performance measurements in incompressible flow were performed in a low speedwind tunnel at an engine representative Reynolds number based on mainstream flow andhole diameter. For these experiments, the coolant to mainstream density ratio wasapproximately unity, and the cooling performance was measured over a flat plate. Theconsole was tested in parallel with cylindrical holes, a slot and fan-shaped holes, all ofwhich had equal throat area per unit width. The heat transfer performance was measured atsteady state using thermochromic liquid crystals sprayed onto a flat plate heater. Theaerodynamic performance of the holes was measured by traversing the boundary layer 50cylindrical hole diameters downstream of the injection location with a pitot probe.Engine representative measurements of the console performance were made in a transonicannular cascade that simulates the three-dimensional flow in the gas turbine. TheReynolds and Mach numbers were representative of engine conditions, and the coolantflow was made aerodynamically and thermodynamically similar to engine conditions bymatching both the momentum flux and density ratios. This was achieved by using a heavyforeign gas with the composition of 30.2% SF6 and 69.8% Ar by weight, which simulatesthe coolant to mainstream density ratio of 1.78, and has a ratio of specific heats of 1.4. Theperformance of a nozzle guide vane with rows of fan-shaped holes was compared with anNGV with a film cooling configuration designed with rows of consoles replacing rows offan-shaped holes. The heat transfer performance was measured using a modified stepchange transient liquid crystal technique. The aerodynamic performance was measuredusing a four hole probe traverse downstream of the NGV.The heat transfer performance of the console was found to be similar to or slightly lowerthan the performance of fan-shaped holes. The most significant benefit of the console wasfound to be the aerodynamic performance, with a loss due to film cooling of only 20% ofthe loss due to film cooling of the rows of fan-shaped holes measured at enginerepresentative conditions." @default.
- W145468802 created "2016-06-24" @default.
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- W145468802 date "2001-06-01" @default.
- W145468802 modified "2023-09-27" @default.
- W145468802 title "Development of a novel film cooling hole geometry" @default.
- W145468802 hasPublicationYear "2001" @default.
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