Heat transfer measurements in a rotating equilateral triangular channel with various rib arrangements

Dong Hyun Lee, Dong Ho Rhee, Hyung Hee Cho, Hee Koo Moon

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

10 Citations (Scopus)

Abstract

The present research investigates the heat transfer characteristics in an equilateral triangular channel to simulate the leading edge cooling passage of a gas turbine blade. The experiments are conducted for the stationary and rotating ribbed channel with three different attack angles (45°, 90° and 135°). Square ribs are installed in a staggered manner on the pressure and suction side surfaces of the channel. The rib height to channel hydraulic diameter ratio (e/D,) is 0.079 and the ribto-rib pitch (p) is 8 times of the rib height. To measure regional-averaged heat transfer coefficients in the channel, two rows of copper blocks with heaters are installed on each surface. The rotation number ranges from 0.0 to 0.1 for the fixed Reynolds number of 10,000. Inlet coolant-to-surface density ratio is about 0.2. For the channel with 90° ribs, the heat transfer rates of all regions have similar values for stationary case. However, for the rotating channel, heat transfer coefficients on the pressure side surface are significantly increased while the suction side surface has quite low heat transfer coefficients due to a single rotating secondary flow induced by Coriolis force. For the channel with angled rib arrangements, a pair of counter-rotating vortices is induced by the angled rib arrangements. High heat transfer coefficients are obtained on the regions near the inner wall for 45° angled ribbed channel and near the leading edge for the 135° angled ribbed channel. The heat transfer coefficients in rotating channel with angled ribs are almost the same as those of stationary case for the tested conditions because the secondary flow dominates the heat transfer. The channel with angled ribs consistently yields better thermal performance than the transverse ribbed channel for the test conditions of the present study.

Original languageEnglish
Title of host publicationProceedings of the ASME Turbo Expo 2006 - Power for Land, Sea, and Air
Pages777-785
Number of pages9
Volume3 PART A
DOIs
Publication statusPublished - 2006 Nov 15
Event2006 ASME 51st Turbo Expo - Barcelona, Spain
Duration: 2006 May 62006 May 11

Other

Other2006 ASME 51st Turbo Expo
CountrySpain
CityBarcelona
Period06/5/606/5/11

Fingerprint

Heat transfer coefficients
Heat transfer
Secondary flow
Coriolis force
Coolants
Turbomachine blades
Gas turbines
Vortex flow
Reynolds number
Hydraulics
Cooling
Copper
Experiments

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Lee, D. H., Rhee, D. H., Cho, H. H., & Moon, H. K. (2006). Heat transfer measurements in a rotating equilateral triangular channel with various rib arrangements. In Proceedings of the ASME Turbo Expo 2006 - Power for Land, Sea, and Air (Vol. 3 PART A, pp. 777-785) https://doi.org/10.1115/GT2006-90973
Lee, Dong Hyun ; Rhee, Dong Ho ; Cho, Hyung Hee ; Moon, Hee Koo. / Heat transfer measurements in a rotating equilateral triangular channel with various rib arrangements. Proceedings of the ASME Turbo Expo 2006 - Power for Land, Sea, and Air. Vol. 3 PART A 2006. pp. 777-785
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Lee, DH, Rhee, DH, Cho, HH & Moon, HK 2006, Heat transfer measurements in a rotating equilateral triangular channel with various rib arrangements. in Proceedings of the ASME Turbo Expo 2006 - Power for Land, Sea, and Air. vol. 3 PART A, pp. 777-785, 2006 ASME 51st Turbo Expo, Barcelona, Spain, 06/5/6. https://doi.org/10.1115/GT2006-90973

Heat transfer measurements in a rotating equilateral triangular channel with various rib arrangements. / Lee, Dong Hyun; Rhee, Dong Ho; Cho, Hyung Hee; Moon, Hee Koo.

Proceedings of the ASME Turbo Expo 2006 - Power for Land, Sea, and Air. Vol. 3 PART A 2006. p. 777-785.

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

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N2 - The present research investigates the heat transfer characteristics in an equilateral triangular channel to simulate the leading edge cooling passage of a gas turbine blade. The experiments are conducted for the stationary and rotating ribbed channel with three different attack angles (45°, 90° and 135°). Square ribs are installed in a staggered manner on the pressure and suction side surfaces of the channel. The rib height to channel hydraulic diameter ratio (e/Dṅ,) is 0.079 and the ribto-rib pitch (p) is 8 times of the rib height. To measure regional-averaged heat transfer coefficients in the channel, two rows of copper blocks with heaters are installed on each surface. The rotation number ranges from 0.0 to 0.1 for the fixed Reynolds number of 10,000. Inlet coolant-to-surface density ratio is about 0.2. For the channel with 90° ribs, the heat transfer rates of all regions have similar values for stationary case. However, for the rotating channel, heat transfer coefficients on the pressure side surface are significantly increased while the suction side surface has quite low heat transfer coefficients due to a single rotating secondary flow induced by Coriolis force. For the channel with angled rib arrangements, a pair of counter-rotating vortices is induced by the angled rib arrangements. High heat transfer coefficients are obtained on the regions near the inner wall for 45° angled ribbed channel and near the leading edge for the 135° angled ribbed channel. The heat transfer coefficients in rotating channel with angled ribs are almost the same as those of stationary case for the tested conditions because the secondary flow dominates the heat transfer. The channel with angled ribs consistently yields better thermal performance than the transverse ribbed channel for the test conditions of the present study.

AB - The present research investigates the heat transfer characteristics in an equilateral triangular channel to simulate the leading edge cooling passage of a gas turbine blade. The experiments are conducted for the stationary and rotating ribbed channel with three different attack angles (45°, 90° and 135°). Square ribs are installed in a staggered manner on the pressure and suction side surfaces of the channel. The rib height to channel hydraulic diameter ratio (e/Dṅ,) is 0.079 and the ribto-rib pitch (p) is 8 times of the rib height. To measure regional-averaged heat transfer coefficients in the channel, two rows of copper blocks with heaters are installed on each surface. The rotation number ranges from 0.0 to 0.1 for the fixed Reynolds number of 10,000. Inlet coolant-to-surface density ratio is about 0.2. For the channel with 90° ribs, the heat transfer rates of all regions have similar values for stationary case. However, for the rotating channel, heat transfer coefficients on the pressure side surface are significantly increased while the suction side surface has quite low heat transfer coefficients due to a single rotating secondary flow induced by Coriolis force. For the channel with angled rib arrangements, a pair of counter-rotating vortices is induced by the angled rib arrangements. High heat transfer coefficients are obtained on the regions near the inner wall for 45° angled ribbed channel and near the leading edge for the 135° angled ribbed channel. The heat transfer coefficients in rotating channel with angled ribs are almost the same as those of stationary case for the tested conditions because the secondary flow dominates the heat transfer. The channel with angled ribs consistently yields better thermal performance than the transverse ribbed channel for the test conditions of the present study.

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Lee DH, Rhee DH, Cho HH, Moon HK. Heat transfer measurements in a rotating equilateral triangular channel with various rib arrangements. In Proceedings of the ASME Turbo Expo 2006 - Power for Land, Sea, and Air. Vol. 3 PART A. 2006. p. 777-785 https://doi.org/10.1115/GT2006-90973