Detailed studies on separated boundary layers over low-pressure turbine airfoils under several high lift conditions: Effect of freesteam turbulence

Ken Ichi Funazaki, Kazutoyo Yamada, Nozomi Tanaka, Yasuhiro Chiba

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

2 Citations (Scopus)

Abstract

This paper deals with experimental investigation on the interaction between inlet freestream turbulence and boundary layers with separation bubble on a low-pressure turbine airfoil under several High Lift conditions. Solidity of the cascade can be reduced by increasing the airfoil pitch by 25%, while maintaining the throat in the blade-to-blade passage. Reynolds number examined is 57000, based on chord length and averaged exit velocity. Freestream turbulence intensity at the inlet is varied from 0.80% (no grid condition) to 2.1% by use of turbulence grid. Hot-wire probe measurements of the boundary layer on the suction surface for Low Pressure (LP) turbines rotor are carried out to obtain time-averaged and time-resolved characteristics of the boundary layers under the influence of the freestream turbulence. Frequency analysis extracts some important features of the unsteady behaviors of the boundary layer, including vortex formation and shedding. Numerical analysis based on high resolution Large Eddy Simulation is also executed to enhance the understanding on the flow field around the highly loaded turbine airfoils. Standard Smagorinsky model is employed as subgrid scale model. Emphasis of the simulation is placed on the relationship of inherent instability of the shear layer of the separation bubble and the freestream turbulence.

Original languageEnglish
Title of host publicationProceedings of the ASME Turbo Expo 2009
Subtitle of host publicationPower for Land, Sea and Air
Pages1013-1027
Number of pages15
EditionPART B
DOIs
Publication statusPublished - Dec 1 2009
Event2009 ASME Turbo Expo - Orlando, FL, United States
Duration: Jun 8 2009Jun 12 2009

Publication series

NameProceedings of the ASME Turbo Expo
NumberPART B
Volume7

Other

Other2009 ASME Turbo Expo
CountryUnited States
CityOrlando, FL
Period6/8/096/12/09

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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    Funazaki, K. I., Yamada, K., Tanaka, N., & Chiba, Y. (2009). Detailed studies on separated boundary layers over low-pressure turbine airfoils under several high lift conditions: Effect of freesteam turbulence. In Proceedings of the ASME Turbo Expo 2009: Power for Land, Sea and Air (PART B ed., pp. 1013-1027). (Proceedings of the ASME Turbo Expo; Vol. 7, No. PART B). https://doi.org/10.1115/GT2009-59813