NDLI: Detailed Studies on Separated Boundary Layers Over Low-Pressure Turbine Airfoils Under Several High Lift Conditions: Effect of Freesteam Turbulence

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Funazaki, Ken-Ichi Yamada, Kazutoyo Tanaka, Nozomi Chiba, Yasuhiro
Copyright Year	2009
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.
Sponsorship	International Gas Turbine Institute
Starting Page	1013
Ending Page	1027
Page Count	15
File Format	PDF
ISBN	9780791848883
DOI	10.1115/GT2009-59813
e-ISBN	9780791838495
Volume Number	Volume 7: Turbomachinery, Parts A and B
Conference Proceedings	ASME Turbo Expo 2009: Power for Land, Sea, and Air
Language	English
Publisher Date	2009-06-08
Publisher Place	Orlando, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Suction Turbulence Blades Cascades (fluid dynamics) Reynolds number Rotors Airfoils Separation (technology) Wire Pressure Flow (dynamics) Bubbles Large eddy simulation Numerical analysis Simulation Vortices Chords (trusses) Resolution (optics) Shear (mechanics) Probes Boundary layers Turbines
Content Type	Text
Resource Type	Article

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