A-5 ピンフィンの傾斜がタービン翼冷却に及ぼす影響に関する研究(伝熱・冷却,一般講演)

概要

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For the improvement of thermal efficiency of gas turbine engines, it is necessary to increase turbine inlet temperature. Blade cooling technologies have been adapted to protect the components from hot gas. Short pin fins are often used to increase the heat transfer to the coolant inside the trailing edge of turbine blade. The effects of pin inclination have been reported by measuring local heat transfer distribution of only single pin or pin fin arrays especially at endwalls. In this study we focus on the effects of pin inclination for overall cooling performance including heat conduction between the pins and endwall. High temperature wind tunnel was used to measure cooling effectiveness of four test pieces with different pin fin arrays. The experiments were performed in the range of 4,000 < Re_D < 46,000. The measured data suggest that the streamwise inclination θ = -45° (upstreamwise) is more effective (+5%) than the other arrangements (θ = 0°, +45°, ±45°). The inclined pin show about 30% less pressure loss than that of the perpendicular pin in spite of almost the same averaged cooling effectiveness.
公益社団法人日本ガスタービン学会の論文
2010-10-20