Effect of shelf squealer tip configurations on film cooling effectiveness

Jeongju Kim, Wonjik Seo, Minho Bang, Seon Ho Kim, Seok Min Choi, Hyung Hee Cho

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

Abstract

Film cooling effectiveness and heat transfer were measured in squealer tip configurations on the blade tip surface. Three different shelf squealer tip geometries were studied: conventional, vertical, and inclined. The experiment was carried out in a wind tunnel with an inlet mainstream Reynolds number, based on the axial chord length of the blade, of 140,000. The experiments were conducted in five blades in linear cascade with an averaged turbulence intensity of 8.5%. The film cooling effectiveness and heat transfer coefficient on the tip surface were obtained using the transient IR thermography technique. For the pressure side film cooling holes, averaging blowing ratios (M) of 1.0 and 2.0 were set. The results showed the film cooling effectiveness distributions on the tip surface. Owing to the mainstream, the cooling effect appeared after x/Cx = 0.15 and the film cooling effectiveness tended to increase toward downstream of the trailing edge. Additionally, the heat transfer distributions were investigated regarding the film cooling holes. In the presence of film cooling holes, the heat transfer distribution had more uniformity than without them on the pressure side. As the blowing ratio increased from 1 to 2, the heat transfer was decreased on the tip surface. The heat transfer ratio represented the change of heat transfer distribution with and without film cooling holes. Those of results were compared in three squealer tip geometries. The overall area-Averaged net heat flux reduction (NHFR) levels on the tip surface were enhanced as the blowing ratio increased. The NHFR of the shelf squealer tip configurations was better than that with the conventional squealer tip.

Original languageEnglish
Title of host publicationHeat Transfer
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Print)9780791851104
DOIs
Publication statusPublished - 2018
EventASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018 - Oslo, Norway
Duration: 2018 Jun 112018 Jun 15

Publication series

NameProceedings of the ASME Turbo Expo
Volume5C-2018

Other

OtherASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018
CountryNorway
CityOslo
Period18/6/1118/6/15

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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  • Cite this

    Kim, J., Seo, W., Bang, M., Kim, S. H., Choi, S. M., & Cho, H. H. (2018). Effect of shelf squealer tip configurations on film cooling effectiveness. In Heat Transfer (Proceedings of the ASME Turbo Expo; Vol. 5C-2018). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/GT2018-75377