3次元熱伝導を考慮した過渡応答法によるディンプル面の熱伝達特性の計測 : 60度傾斜ティアドロップディンプルの伝熱性能評価

概要

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Recently, heat transfer enhancement with dimples is becoming attractive for internal cooling of gas turbine blade because it induces small pressure loss for moderate heat transfer enhancement. Teardrop-shaped dimples showed high heat transfer performance in previous study, and furthermore inclination of teardrop-shaped dimples with respect to the main stream direction has potential of higher heat transfer performance by inducing secondary flow. In this study, 60deg angled teardrop-shaped dimple case was experimentally compared with the cases of spherical dimple and teardrop-shaped dimple without inclination. The heat transfer measurements were performed by using transient technique with compensation of three-dimensional heat conduction for Re=16,000-36,000. In addition, flow visualization with combination of oil-film method and PIV was performed for Re=30,000. The present results clearly showed the areas of flow separation and reattachment and the heat transfer characteristics of 60deg angled teardrop-shaped dimple. At the same blowing power, the heat transfer of 60deg angled teardrop-shaped dimple case was higher than spherical dimple case by 5%, but lower than teardrop-shaped dimple without inclination case by 13% as maximum difference.
公益社団法人日本ガスタービン学会の論文
2013-05-20