NDLI: Calculations of High-Lift Cascades in Low Pressure Turbine Conditions Using a Three-Equation Model

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Pacciani, Roberto Marconcini, Michele Fadai-Ghotbi, Atabak Lardeau, Sylvain Michael, A. Leschziner
Copyright Year	2009
Abstract	A three-equation model has been applied to the prediction of separation-induced transition in high-lift low-Reynolds-number cascade flows. Classical turbulence models fail to predict accurately laminar separation and turbulent reattachment, and usually over-predict the separation length, the main reason for this being the slow rise of the turbulent kinetic energy in the early stage of the separation process. The proposed approach is based on solving an additional transport equation for the so-called laminar kinetic energy, which allows the increase of the non-turbulent fluctuations in the pre-transitional and transitional region to be taken into account. The model is derived from that of Lardeau and Leschziner, which was originally formulated to predict bypass transition for attached flows, subject to a wide range of free-stream turbulence intensity. A new production term is proposed, based on the mean shear and a laminar eddy-viscosity concept. After a validation of the model for a flat-plate boundary layer, subjected to an adverse pressure gradient, the T106 and T2 cascades, recently tested at the von Ka´rma´n Institute, are selected as test cases to assess the ability of the model to predict the flow around high-lift cascades in conditions representative of those in low-pressure turbines. Good agreement with experimental data, in terms of blade-load distributions, separation onset, reattachment locations and losses, is found over a wide range of Reynolds-number values.
Sponsorship	International Gas Turbine Institute
Starting Page	433
Ending Page	442
Page Count	10
File Format	PDF
ISBN	9780791848883
DOI	10.1115/GT2009-59557
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	Viscosity Turbulence Blades Flat plates Cascades (fluid dynamics) Reynolds number Pressure gradient Separation (technology) Pressure Flow (dynamics) Stress Eddies (fluid dynamics) Fluctuations (physics) Kinetic energy Shear (mechanics) Turbines Boundary layers
Content Type	Text
Resource Type	Article

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