ENHANCEMENT OF FILM EFFECTIVENESS OF COOLING HOLES WITH FAN-SHAPED EXIT GEOMETRY BY THE APPLICATION OF DOUBLE FLOW-CONTROL DEVICES: OPTIMIZATION IN CONSIDERATION OF DEVICE OFFSET

摘要

This study deals with CFD-based optimization of Double Flow Control Devices (DFCDs); a patented technology for enhancing film effectiveness using Taguchi method as a robust optimizing technique. This study adopts offset of the devices with respect to the centerline of the hole, which may happen in the manufacturing process, as a noise factor in the optimizing process. The aim of this study is to explore a possibility of DFCDs to improve the cooling performance of a sophisticated fan-shaped cooling hole called 7-7-7 shaped hole developed by Penn State University [9]. Aerodynamic and thermal performances of the optimized DFCD model were evaluated through the detailed experiments using IR camera and temperature rake.