NDLI: An Experimental Investigation of the Separated-Flow Transition Under High-Lift Turbine Blade Pressure Gradients

Content Provider	Springer Nature Link
Author	Simoni, Daniele Ubaldi, Marina Zuni, Pietro Lengani, Davide Bertini, Francesco
Copyright Year	2011
Abstract	Laminar boundary layer separation, shear layer transition and reattachment have been experimentally investigated on a flat plate installed within a double contoured test section designed to produce an adverse pressure gradient typical of Ultra-High-Lift turbine profiles. Measurements have been performed for the Reynolds number range 70,000 < Re < 200,000, typical of real engine operation. Profile aerodynamic loadings as well as boundary layer velocity profiles have been measured to survey the separation and transition processes. Particle Image Velocimetry measurements allowed the visualization of vortical structures induced by the shear layer instability. Spectral analysis of hot-wire velocity data has been adopted to identify the characteristic frequencies of the phenomena. Distinct energy peaks, associated with the Kelvin–Helmholtz waves generated in the shear layer over the separation bubble, appear in the spectra. In particular the evolution along the shear layer of the energy contents at the characteristic frequencies of the phenomenon has been analyzed. Two frequency ranges have been identified in which the instability waves are amplified within the shear layer over the stagnation area. The inviscid Kelvin–Helmholtz instability is the main mechanism that drives transition, but it starts to be relevant only after that lower frequency oscillations are amplified and reach the saturation.
Starting Page	45
Ending Page	62
Page Count	18
File Format	PDF
ISSN	13866184
Journal	Flow, Turbulence and Combustion
Volume Number	88
Issue Number	1-2
e-ISSN	15731987
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-11-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Separated-flow transition Kelvin–Helmholtz instability Turbine blade profiles Fluid- and Aerodynamics Automotive Engineering Engineering Thermodynamics, Heat and Mass Transfer Engineering Fluid Dynamics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry Chemical Engineering

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