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%.
Skip Nav Destination
ASME Turbo Expo 2010: Power for Land, Sea, and Air
June 14–18, 2010
Glasgow, UK
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4401-4
PROCEEDINGS PAPER
Aerodynamic Analysis of an Innovative Low Pressure Vane Placed in a S-Shape Duct
S. Lavagnoli,
S. Lavagnoli
von Karman Institute for Fluid Dynamics, Rhode Saint Gene`se, Belgium
Search for other works by this author on:
T. Yasa,
T. Yasa
von Karman Institute for Fluid Dynamics, Rhode Saint Gene`se, Belgium
Search for other works by this author on:
G. Paniagua,
G. Paniagua
von Karman Institute for Fluid Dynamics, Rhode Saint Gene`se, Belgium
Search for other works by this author on:
S. Duni,
S. Duni
von Karman Institute for Fluid Dynamics, Rhode Saint Gene`se, Belgium
Search for other works by this author on:
L. Castillon
L. Castillon
ONERA, Meudon, France
Search for other works by this author on:
S. Lavagnoli
von Karman Institute for Fluid Dynamics, Rhode Saint Gene`se, Belgium
T. Yasa
von Karman Institute for Fluid Dynamics, Rhode Saint Gene`se, Belgium
G. Paniagua
von Karman Institute for Fluid Dynamics, Rhode Saint Gene`se, Belgium
S. Duni
von Karman Institute for Fluid Dynamics, Rhode Saint Gene`se, Belgium
L. Castillon
ONERA, Meudon, France
Paper No:
GT2010-22546, pp. 1175-1188; 14 pages
Published Online:
December 22, 2010
Citation
Lavagnoli, S, Yasa, T, Paniagua, G, Duni, S, & Castillon, L. "Aerodynamic Analysis of an Innovative Low Pressure Vane Placed in a S-Shape Duct." Proceedings of the ASME Turbo Expo 2010: Power for Land, Sea, and Air. Volume 6: Structures and Dynamics, Parts A and B. Glasgow, UK. June 14–18, 2010. pp. 1175-1188. ASME. https://doi.org/10.1115/GT2010-22546
Download citation file:
21
Views
Related Proceedings Papers
Related Articles
Aerodynamic Analysis of an Innovative Low Pressure Vane Placed in an s-Shape Duct
J. Turbomach (January,2012)
Experimental
Investigation of the Clocking Effect in a 1.5-Stage Axial Turbine—Part II: Unsteady Results
and Boundary Layer Behavior
J. Turbomach (April,2009)
Influence of Stator-Rotor Interaction on the Aerothermal Performance of Recess Blade Tips
J. Turbomach (January,2011)
Related Chapters
Experimental Investigation of Ventilated Supercavitation Under Unsteady Conditions
Proceedings of the 10th International Symposium on Cavitation (CAV2018)
Outlook
Closed-Cycle Gas Turbines: Operating Experience and Future Potential
Experimental Characterization of a Cavitating Orifice
Proceedings of the 10th International Symposium on Cavitation (CAV2018)