IGTC-35 Effect of Periodic Wake Passing on Film Effectiveness of Inclined Discrete Cooling Holes around the Leading Edge of a Blunt Body(Session B-3 BLADE COOLING)

概要

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Detailed studies are conducted on film effectiveness of inclined discrete cooling holes around the leading edge of a blunt body that is subjected to periodically incoming wakes as well as free-stream turbulence with various levels of intensity. The cooling holes have a configuration similar to that of typical turbine blades and are angled at 30 and 90 degree to the surface in the spanwise and streamwise directions, respectively. A spoke-wheel type wake generator is used in this study to simulate periodically incoming wakes to turbine blades. In addition, two types of turbulence grids are used to elevate a free-stream turbulence intensity. We adopt three blowing ratios of the secondary air to the mainstream. Most of the dominant flow conditions are reproduced in this study except for the air density ratio of the secondary air and the main stream. For each of the blowing ratios, wall temperature around the surface of the test model are measured by thermocouples situated inside the model. The temperature is visualized using liquid crystals in order to obtain qualitative information of film effectiveness distribution.
公益社団法人日本ガスタービン学会の論文