Rib spacing effect on heat transfer and pressure loss in a rotating two-pass rectangular channel (AR=1:2) with 45-degree angled ribs

Yao-Hsien Liu*, Lesley M. Wright, Wen Lung Fu, Je Chin Han

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

15 Scopus citations

Abstract

Rib turbulators are commonly used to enhance the heat transfer within internal cooling passages of advanced gas turbine blades. Many factors affect the thermal performance of a cooling channel with ribs. This study experimentally investigates the effect of rib spacing on the heat transfer enhancement, pressure penalty, and thus the overall thermal performance in both rotating and non-rotating rectangular, cooling channels. In the 1:2 rectangular channels, 45° angled ribs are placed on the leading and trailing surfaces. The pitch of the ribs varies, so rib pitch-to-height (P/e) ratios of 10, 7.5, 5, and 3 are considered. Square ribs with a 1.59 mm × 1.59 mm cross-section are used for all spacings, so the height-to-hydraulic diameter (e/Dh) ratio remains constant at 0.094. With a constant rotational speed of 550 rpm and the Reynolds number ranging from 5000 to 40000, the rotation number in turn varies from 0.2 to 0.02. Because the skewed turbulators induce secondary flow along the length of the rib, the very close rib spacing of P/e = 3, has the best thermal performance in both rotating and non-rotating channels. This close spacing yields the greatest heat transfer enhancement, while the P/e = 5 spacing has the greatest pressure penalty. In addition, the effect of rotation is more pronounced in the channel with the rib spacing of 3. As more ribs are added, the channel is approaching a smooth channel, and the strength of the rotation induced vortices increases.

Original languageEnglish
Title of host publicationProceedings of the ASME Turbo Expo 2006 - Power for Land, Sea, and Air
Pages363-373
Number of pages11
DOIs
StatePublished - 15 Nov 2006
Event2006 ASME 51st Turbo Expo - Barcelona, Spain
Duration: 6 May 200611 May 2006

Publication series

NameProceedings of the ASME Turbo Expo
Volume3 PART A

Conference

Conference2006 ASME 51st Turbo Expo
CountrySpain
CityBarcelona
Period6/05/0611/05/06

Fingerprint Dive into the research topics of 'Rib spacing effect on heat transfer and pressure loss in a rotating two-pass rectangular channel (AR=1:2) with 45-degree angled ribs'. Together they form a unique fingerprint.

  • Cite this

    Liu, Y-H., Wright, L. M., Fu, W. L., & Han, J. C. (2006). Rib spacing effect on heat transfer and pressure loss in a rotating two-pass rectangular channel (AR=1:2) with 45-degree angled ribs. In Proceedings of the ASME Turbo Expo 2006 - Power for Land, Sea, and Air (pp. 363-373). (Proceedings of the ASME Turbo Expo; Vol. 3 PART A). https://doi.org/10.1115/GT2006-90368