Numerical study of the rib arrangements for enhancing heat transfer in a two-pass channel of large aspect ratio

Sol Han, Seok Min Choi, Ho Seong Sohn, Hyung Hee Cho

Research output: Contribution to journalArticle

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°, rib pitch-to-height ratio (p/e) was 10, and the rib height-tohydraulic- diameter ratio (e/Dh) 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.

Original languageEnglish
Pages (from-to)161-169
Number of pages9
JournalTransactions of the Korean Society of Mechanical Engineers, B
Volume41
Issue number3
DOIs
Publication statusPublished - 2017 Jan 1

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Aspect ratio
Angle of attack
Heat transfer
Vortex flow
Flow separation
Flow patterns
Reynolds number
Hydraulics
Cooling

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

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title = "Numerical study of the rib arrangements for enhancing heat transfer in a two-pass channel of large aspect ratio",
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°, rib pitch-to-height ratio (p/e) was 10, and the rib height-tohydraulic- diameter ratio (e/Dh) 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.",
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Numerical study of the rib arrangements for enhancing heat transfer in a two-pass channel of large aspect ratio. / Han, Sol; Choi, Seok Min; Sohn, Ho Seong; Cho, Hyung Hee.

In: Transactions of the Korean Society of Mechanical Engineers, B, Vol. 41, No. 3, 01.01.2017, p. 161-169.

Research output: Contribution to journalArticle

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