PIV measurements in a two-pass 90-deg ribbed-wall parallelogram channel

Tong Miin Liou, Shyy-Woei Chang, Shu Po Chan, Yu Shuai Liu

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

3 Citations (Scopus)

Abstract

A parallelogram channel has drawn very little or no attention in the open literature although it appears as a crosssectional configuration of some gas turbine rotor blades. Particle Image velocimetry is presented of local flow structure in a two-pass 90-deg ribbed-wall parallelogram channel with a 180-deg sharp turn. The channel has a cross-sectional equal length, 45.5 mm, of adjacent sides and two pairs of opposite angles are 45-deg and 135-deg. The rib height to channel height ratio is 0.1. All the measurements were performed at a fixed Reynolds number, characterized by channel hydraulic diameter of 32.17 mm and cross-sectional bulk mean velocity, of 10000 and a null rotating number. Results are discussed in terms of the distributions of streamwise and secondary-flow mean velocity vector, turbulent intensity, Reynolds stress, and turbulent kinetic energy of the cooling air. It is found that the flow is not periodically fully developed in pitchwise direction through the inline 90-deg ribbed straight inlet and outlet leg. Pitchwise variation of reattachment length is revealed and comparison with reported values in square channels is made. Whether the 180-deg sharp turn induced separation bubble exists in the ribbed parallelogram channel is also documented. Moreover, the measured secondary flow results inside the turn are successively used to explain previous heat transfer trends.

Original languageEnglish
Title of host publicationHeat Transfer
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791845714
DOIs
Publication statusPublished - 2014 Jan 1
EventASME Turbo Expo 2014: Turbine Technical Conference and Exposition, GT 2014 - Dusseldorf, Germany
Duration: 2014 Jun 162014 Jun 20

Publication series

NameProceedings of the ASME Turbo Expo
Volume5A

Other

OtherASME Turbo Expo 2014: Turbine Technical Conference and Exposition, GT 2014
CountryGermany
CityDusseldorf
Period14-06-1614-06-20

Fingerprint

Secondary flow
Flow structure
Kinetic energy
Velocity measurement
Turbomachine blades
Gas turbines
Reynolds number
Rotors
Hydraulics
Heat transfer
Cooling
Air

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Liou, T. M., Chang, S-W., Chan, S. P., & Liu, Y. S. (2014). PIV measurements in a two-pass 90-deg ribbed-wall parallelogram channel. In Heat Transfer (Proceedings of the ASME Turbo Expo; Vol. 5A). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/GT2014-25248
Liou, Tong Miin ; Chang, Shyy-Woei ; Chan, Shu Po ; Liu, Yu Shuai. / PIV measurements in a two-pass 90-deg ribbed-wall parallelogram channel. Heat Transfer. American Society of Mechanical Engineers (ASME), 2014. (Proceedings of the ASME Turbo Expo).
@inproceedings{ec6a96135b0249238023fba48ff8d3ef,
title = "PIV measurements in a two-pass 90-deg ribbed-wall parallelogram channel",
abstract = "A parallelogram channel has drawn very little or no attention in the open literature although it appears as a crosssectional configuration of some gas turbine rotor blades. Particle Image velocimetry is presented of local flow structure in a two-pass 90-deg ribbed-wall parallelogram channel with a 180-deg sharp turn. The channel has a cross-sectional equal length, 45.5 mm, of adjacent sides and two pairs of opposite angles are 45-deg and 135-deg. The rib height to channel height ratio is 0.1. All the measurements were performed at a fixed Reynolds number, characterized by channel hydraulic diameter of 32.17 mm and cross-sectional bulk mean velocity, of 10000 and a null rotating number. Results are discussed in terms of the distributions of streamwise and secondary-flow mean velocity vector, turbulent intensity, Reynolds stress, and turbulent kinetic energy of the cooling air. It is found that the flow is not periodically fully developed in pitchwise direction through the inline 90-deg ribbed straight inlet and outlet leg. Pitchwise variation of reattachment length is revealed and comparison with reported values in square channels is made. Whether the 180-deg sharp turn induced separation bubble exists in the ribbed parallelogram channel is also documented. Moreover, the measured secondary flow results inside the turn are successively used to explain previous heat transfer trends.",
author = "Liou, {Tong Miin} and Shyy-Woei Chang and Chan, {Shu Po} and Liu, {Yu Shuai}",
year = "2014",
month = "1",
day = "1",
doi = "10.1115/GT2014-25248",
language = "English",
series = "Proceedings of the ASME Turbo Expo",
publisher = "American Society of Mechanical Engineers (ASME)",
booktitle = "Heat Transfer",

}

Liou, TM, Chang, S-W, Chan, SP & Liu, YS 2014, PIV measurements in a two-pass 90-deg ribbed-wall parallelogram channel. in Heat Transfer. Proceedings of the ASME Turbo Expo, vol. 5A, American Society of Mechanical Engineers (ASME), ASME Turbo Expo 2014: Turbine Technical Conference and Exposition, GT 2014, Dusseldorf, Germany, 14-06-16. https://doi.org/10.1115/GT2014-25248

PIV measurements in a two-pass 90-deg ribbed-wall parallelogram channel. / Liou, Tong Miin; Chang, Shyy-Woei; Chan, Shu Po; Liu, Yu Shuai.

Heat Transfer. American Society of Mechanical Engineers (ASME), 2014. (Proceedings of the ASME Turbo Expo; Vol. 5A).

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

TY - GEN

T1 - PIV measurements in a two-pass 90-deg ribbed-wall parallelogram channel

AU - Liou, Tong Miin

AU - Chang, Shyy-Woei

AU - Chan, Shu Po

AU - Liu, Yu Shuai

PY - 2014/1/1

Y1 - 2014/1/1

N2 - A parallelogram channel has drawn very little or no attention in the open literature although it appears as a crosssectional configuration of some gas turbine rotor blades. Particle Image velocimetry is presented of local flow structure in a two-pass 90-deg ribbed-wall parallelogram channel with a 180-deg sharp turn. The channel has a cross-sectional equal length, 45.5 mm, of adjacent sides and two pairs of opposite angles are 45-deg and 135-deg. The rib height to channel height ratio is 0.1. All the measurements were performed at a fixed Reynolds number, characterized by channel hydraulic diameter of 32.17 mm and cross-sectional bulk mean velocity, of 10000 and a null rotating number. Results are discussed in terms of the distributions of streamwise and secondary-flow mean velocity vector, turbulent intensity, Reynolds stress, and turbulent kinetic energy of the cooling air. It is found that the flow is not periodically fully developed in pitchwise direction through the inline 90-deg ribbed straight inlet and outlet leg. Pitchwise variation of reattachment length is revealed and comparison with reported values in square channels is made. Whether the 180-deg sharp turn induced separation bubble exists in the ribbed parallelogram channel is also documented. Moreover, the measured secondary flow results inside the turn are successively used to explain previous heat transfer trends.

AB - A parallelogram channel has drawn very little or no attention in the open literature although it appears as a crosssectional configuration of some gas turbine rotor blades. Particle Image velocimetry is presented of local flow structure in a two-pass 90-deg ribbed-wall parallelogram channel with a 180-deg sharp turn. The channel has a cross-sectional equal length, 45.5 mm, of adjacent sides and two pairs of opposite angles are 45-deg and 135-deg. The rib height to channel height ratio is 0.1. All the measurements were performed at a fixed Reynolds number, characterized by channel hydraulic diameter of 32.17 mm and cross-sectional bulk mean velocity, of 10000 and a null rotating number. Results are discussed in terms of the distributions of streamwise and secondary-flow mean velocity vector, turbulent intensity, Reynolds stress, and turbulent kinetic energy of the cooling air. It is found that the flow is not periodically fully developed in pitchwise direction through the inline 90-deg ribbed straight inlet and outlet leg. Pitchwise variation of reattachment length is revealed and comparison with reported values in square channels is made. Whether the 180-deg sharp turn induced separation bubble exists in the ribbed parallelogram channel is also documented. Moreover, the measured secondary flow results inside the turn are successively used to explain previous heat transfer trends.

UR - http://www.scopus.com/inward/record.url?scp=84922269762&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84922269762&partnerID=8YFLogxK

U2 - 10.1115/GT2014-25248

DO - 10.1115/GT2014-25248

M3 - Conference contribution

T3 - Proceedings of the ASME Turbo Expo

BT - Heat Transfer

PB - American Society of Mechanical Engineers (ASME)

ER -

Liou TM, Chang S-W, Chan SP, Liu YS. PIV measurements in a two-pass 90-deg ribbed-wall parallelogram channel. In Heat Transfer. American Society of Mechanical Engineers (ASME). 2014. (Proceedings of the ASME Turbo Expo). https://doi.org/10.1115/GT2014-25248