Flowfield measurements in a single row of low aspect ratio pin-fins

Jason K. Ostanek, Karen A. Thole

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

5 Scopus citations

Abstract

Pin-fin arrays are commonly used as compact heat exchangers for cooling the trailing edge of gas turbine airfoils. While much research has been devoted to the heat transfer characteristics of various pin-fin configurations, little work has been done to investigate the flowfield in pin-fin arrays. Such information may allow for further optimization of pin-fin configurations. A new pin-fin facility at large scale has been constructed to allow optical access for the use of non-intrusive measurement techniques such as laser Doppler velocimetry and time-resolved, digital particle image velocimetry. Using these techniques, the flow through a single row of pin-fins having a height-to-diameter ratio of 2 and span-to-diameter ratio of 2.5 was investigated. Results show that the length of the wake region decreases with increasing Reynolds number. At higher Reynolds numbers, Kármán vortices developed closer to the pin-fins than for single, infinitely long cylinders. Transverse fluctuations correlated well with endwall heat transfer indicating that the Kármán vortices play a key role in energy transport.

Original languageEnglish (US)
Title of host publicationASME 2011 Turbo Expo
Subtitle of host publicationTurbine Technical Conference and Exposition, GT2011
Pages1293-1304
Number of pages12
EditionPARTS A AND B
DOIs
StatePublished - Dec 1 2011
EventASME 2011 Turbo Expo: Turbine Technical Conference and Exposition, GT2011 - Vancouver, BC, Canada
Duration: Jun 6 2011Jun 10 2011

Publication series

NameProceedings of the ASME Turbo Expo
NumberPARTS A AND B
Volume5

Other

OtherASME 2011 Turbo Expo: Turbine Technical Conference and Exposition, GT2011
CountryCanada
CityVancouver, BC
Period6/6/116/10/11

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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    Ostanek, J. K., & Thole, K. A. (2011). Flowfield measurements in a single row of low aspect ratio pin-fins. In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition, GT2011 (PARTS A AND B ed., pp. 1293-1304). (Proceedings of the ASME Turbo Expo; Vol. 5, No. PARTS A AND B). https://doi.org/10.1115/GT2011-45757