Numerical study of a novel curved pin fin for heat transfer enhancement within aeroengine turbine blade

This paper introduces and develops a novel curved pin fin for heat transfer enhancement of aeroengine turbine blade. The effects of inclination angle and vertical segment length of curved pin fin on heat transfer performance are studied under stationary and rotating condition. Four cases with different inclination angle (90°, 75°, 60° and 45°) and four cases with different vertical segment length (9, 7, 5 and 3) are studied for rotation number varying from 0 to 0.5. Numerical results show that curved pin fins with smaller inclination angle and shorter vertical segment are characterized by lower friction factor and better thermal performance. Compared to upright pin fin, the thermal performance factors for curved pin fins with inclination angle γ=45° and vertical segment length H_v=3 are improved by 6.1% and 14.4%, respectively. Under rotating frame, the effects of Coriolis force are suppressed by curved pin fin, and lower heat transfer enhancement is produced consequently. Moreover, curved pin fin with smaller inclination angle and shorter vertical segment is featured with relatively lower sensitivity with respect to rotation number.