NDLI: Aerodynamic Analysis of an Innovative Low Pressure Vane Placed in a S-Shape Duct

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Lavagnoli, S. Yasa, T. Paniagua, G. Duni, S. Castillon, L.
Copyright Year	2010
Abstract	In this paper the aerodynamics of an innovative multisplitter LP stator downstream of a high-pressure turbine stage is presented. The stator row, located inside a swan necked diffuser, is composed of 16 large structural vanes and 48 small airfoils. The experimental characterization of the steady and unsteady flow field was carried out in a compression tube rig under engine representative conditions. The one-and-a-half turbine stage was tested at three operating regimes by varying the pressure ratio and the rotational speed. Time-averaged and time-accurate surface pressure measurements are used to investigate the aerodynamic performance of the stator and the complex interaction mechanisms with the HP turbine stage. Results show that the strut blade has a strong impact on the steady and unsteady flow field of the small vanes depending on the vane circumferential position. The time-mean pressure distributions around the airfoils show that the strut influence is significant only in the leading edge region. At off-design condition (higher rotor speed) a wide separated region is present on the strut pressure side and it affects the flow field of the adjacent vanes. A complex behavior of the unsteady surface pressures was observed. Up to four pressure peaks are identified in the time-periodic signals. The frequency analysis also shows a complex structure. The spectrum distribution depends on the vane position. The contribution of the harmonics is often larger than the fundamental frequency. The forces acting on the LP stator vanes are calculated. The results show that higher forces act on the small vanes but largest fluctuations are experienced by the strut. The load on the whole stator decreases 30% as the turbine pressure ratio is reduced by approx. 35%.
Sponsorship	International Gas Turbine Institute
Starting Page	1175
Ending Page	1188
Page Count	14
File Format	PDF
ISBN	9780791844014
DOI	10.1115/GT2010-22546
e-ISBN	9780791838723
Volume Number	Volume 6: Structures and Dynamics, Parts A and B
Conference Proceedings	ASME Turbo Expo 2010: Power for Land, Sea, and Air
Language	English
Publisher Date	2010-06-14
Publisher Place	Glasgow, UK
Access Restriction	Subscribed
Subject Keyword	Compression Struts (engineering) Blades Ducts Rotors Airfoils Aerodynamics Unsteady flow Pressure Flow (dynamics) Engines Stress Design High pressure (physics) Stators Experimental characterization Fluctuations (physics) Diffusers Shapes Pressure measurement Signals Turbines
Content Type	Text
Resource Type	Article

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