가스 터빈 블레이드의 립 냉각과 딤플-립 복합 냉각 기법 비교연구

Detailed distributions of the heat transfer coefficients in a channel with angled rib or both rib and dimple were measured by the transient liquid crystal technique. The channel aspect ratio, rib height, rip pitch, rib angle were 2, 6 ㎜, 60 ㎜, and 60 degree, respectively. The diameters and center-to-center distance of the dimple were 6 ㎜ and 7.2 ㎜, respectively. Results show that the distribution of heat transfer coefficient was asymmetric due to the secondary flow induced by the angled rib. Also, dimples fabricated between the ribs increased the heat coefficient. Thus, the compound cooling technique with angled rib arid dimple can be improve the heat transfer performance of a gas turbine blade.