Channel orientation effect on endwall heat transfer in rotating cooling passages with pin-fins

Szu Chi Huang, Chen Chih Wang, Yao-Hsien Liu*

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Heat transfer was experimentally measured using a rotating pin-fin channel involving two channel orientations, namely 90° and 150° with respect to a rotating axis. A rectangular channel with an aspect ratio of 4:1 was selected to study internal cooling near the trailing edge of a turbine blade. A newly developed method of liquid crystal thermography along with stroboscopic photography was used to obtain detailed heat transfer contours on an endwall surface. The pin-fin arrays were designed in either inline or staggered patterns, and the Reynolds number ranged from 5,000 to 20,000. The pressurized air flow acted as the working fluid, and the highest rotation number was thus 0.39. The influence of rotation was greater on the inline array than on the staggered array, engendering higher heat transfer enhancement on the leading and trailing surfaces. Compared with the other orientation, the inclined orientation (150°) engendered a larger spanwise heat transfer variation because of the shifted rotation-induced secondary flows. The inline array exhibited the highest rotation-induced heat transfer enhancement at the 90° orientation, and the highest enhancement levels were 90% and 40% on the trailing and leading surfaces, respectively.

Original languageEnglish
Pages (from-to)1115-1126
Number of pages12
JournalInternational Journal of Heat and Mass Transfer
Volume136
DOIs
StatePublished - 1 Jun 2019

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