NDLI: Effect of Wake Passing on Unsteady Aerodynamic Performance in a Turbine Stage

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Yamada, K. Funazaki, K. Hiroma, K. Tsutsumi, M. Hirano, Y. Matsuo, A.
Copyright Year	2006
Abstract	In the present work, unsteady RANS simulations were performed to clarify several interesting features of the unsteady three-dimensional flow field in a turbine stage. The unsteady effect was investigated for two cases of axial spacing between stator and rotor, i.e. large and small axial spacing. Simulation results showed that the stator wake was convected from pressure side to suction side in the rotor. As a result, another secondary flow, which counter-rotated against the passage vortices, was periodically generated by the stator wake passing through the rotor passage. It was found that turbine stage efficiency with the small axial spacing was higher than that with the large axial spacing. This was because the stator wake in the small axial spacing case entered the rotor before mixing and induced the stronger counter-rotating vortices to suppress the passage vortices more effectively, while the wake in the large axial spacing case eventually promoted the growth of the secondary flow near the hub due to the migration of the wake towards the hub.
Sponsorship	International Gas Turbine Institute
Starting Page	757
Ending Page	767
Page Count	11
File Format	PDF
ISBN	079184241X
DOI	10.1115/GT2006-90783
e-ISBN	0791837742
Volume Number	Volume 6: Turbomachinery, Parts A and B
Conference Proceedings	ASME Turbo Expo 2006: Power for Land, Sea, and Air
Language	English
Publisher Date	2006-05-08
Publisher Place	Barcelona, Spain
Access Restriction	Subscribed
Subject Keyword	Suction Simulation results Simulation Reynolds-averaged navier–stokes equations Rotors Vortices Wakes Stators Engineering simulation Flow (dynamics) Pressure Turbines
Content Type	Text
Resource Type	Article

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