NDLI: Low-Pressure Turbine Cascade Performance Calculations With Incidence Variation and Periodic Unsteady Inflow Conditions

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Marconcini, Michele Pacciani, Roberto Arnone, Andrea Bertini, Francesco
Copyright Year	2015
Abstract	The performance of a Low-Pressure Turbine (LPT) cascade were investigated under both steady and periodic unsteady inflow boundary conditions with different Reynolds numbers and a reduced frequency representative of real LPT working conditions. A sensitivity analysis to the variation of the inlet flow angle was performed to assess the performance during off-design operation. The numerical framework is based on a steady/unsteady Reynolds Averaged Navier-Stokes (RANS/URANS) flow solver which includes some state-of-the-art transition-sensitive turbulence closures. Boundary conditions for the time-accurate computations upstream of the cascade were derived from the experimental characterization of a moving bar system used to generate the wake periodic perturbations. The computed performance of the cascade, as a function of Reynolds number and incidence angle variation, is discussed in comparison with experimental data. Steady and unsteady boundary layer quantities are also compared with measurements in order to gain more insights into the loss generation process and to better support the numerical results. Such an assessment proves that the proposed procedure is adequate for the analysis of the off-design behavior of cascades operating in low pressure turbine conditions.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791856635
DOI	10.1115/GT2015-42276
Volume Number	Volume 2A: Turbomachinery
Conference Proceedings	ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2015-06-15
Publisher Place	Montreal, Quebec, Canada
Access Restriction	Subscribed
Subject Keyword	Turbulence Sensitivity analysis Cascades (fluid dynamics) Reynolds number Pressure Flow (dynamics) Design Computation Reynolds-averaged navier–stokes equations Experimental characterization Wakes Boundary-value problems Inflow Turbines Boundary layers
Content Type	Text
Resource Type	Article

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