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http://dx.doi.org/10.3795/KSME-B.2017.41.3.161

Numerical Study of the Rib Arrangements for Enhancing Heat Transfer in a Two-pass Channel of Large Aspect Ratio  

Han, Sol (Dept. of Mechanical Engineering, Yonsei Univ.)
Choi, Seok Min (Dept. of Mechanical Engineering, Yonsei Univ.)
Sohn, Ho-Seong (Dept. of Mechanical Engineering, Yonsei Univ.)
Cho, Hyung Hee (Dept. of Mechanical Engineering, Yonsei Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.41, no.3, 2017 , pp. 161-169 More about this Journal
Abstract
The present study investigated the effect of the rib arrangement and a guide vane for enhancing internal cooling of the blade. Two types of rib arrangements were used in the first and second passage in parallel. Aspect ratio of the channel was 5 and a fixed Reynolds number based on hydraulic diameter was 10,000. The attack angle of rib was $60^{\circ}$, rib pitch-to-height ratio (p/e) was 10, and the rib height-to-hydraulic-diameter ratio ($e/D_h$) was 0.075. The effect of an interaction between Dean vortices and the secondary vortices from the first passage was observed. Overall, the attack angle of rib in the first passage was dominant factor to heat transfer and flow patterns in turning region. Also, the channel with a guide vane showed enhanced heat transfer at the tip surface with reducing flow separation and recirculation.
Keywords
Internal Cooling; Angled Rib; Heat Transfer; Guide Vane; Aspect Ratio;
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