An Experimental Investigation of the Separated-Flow Transition Under High-Lift Turbine Blade Pressure Gradients
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- 作者：Daniele Simoni (1)
Marina Ubaldi (1)
Pietro Zunino (1)
Davide Lengani (1) (3)
Francesco Bertini (2) - 关键词：Separated ; flow transition ; Kelvin–Helmholtz instability ; Turbine blade profiles
- 刊名：Flow, Turbulence and Combustion
- 出版年：2012
- 出版时间：2 - March 2012
- 年：2012
- 卷：88
- 期：1
- 页码：45-62
- 全文大小：727KB
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Marina Ubaldi (1)
Pietro Zunino (1)
Davide Lengani (1) (3)
Francesco Bertini (2)
1. DIMSET - Università di Genova, Via Montallegro 1, 16145, Genova, Italy
3. Institute for Thermal Turbomachinery and Machine Dynamics, Graz University of Technology, Graz, Austria
2. Avio R.?D., Via I Maggio 99, 10040, Rivalta (TO), Italy - ISSN：1573-1987
文摘
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.