In the past 10–15 years, substantial effort has been spent on increasing the airfoil lift especially in aero-engine low pressure turbines. This has been attractive, since increased airfoil lift can be used for airfoil count decrease leading to weight and hardware cost reduction. The challenge with this effort consequently has been to keep the efficiency at high levels. Depending on the baseline level of airfoil lift, an increase of 20–50% has been realized and at least partly incorporated in modern turbine designs. With respect to efficiency there is actually an optimum level of airfoil lift. Airfoil rows at a lift level below this optimum suffer from an excessive number of airfoils with too much wetted surface and especially increasing trailing edge losses. Airfoils at lift levels above this optimum suffer from growing losses due to high peak Mach numbers inside the airfoil row, higher rear diffusion on the airfoil suction sides, and increased secondary flow losses. Since fuel cost have been rising significantly, as has been the awareness of the environmental impact of , it becomes more and more important to design low pressure turbines for an optimal trade between efficiency and weight to achieve the lowest engine fuel burn. This paper summarizes work done recently and in the past to address the main influences and mechanisms of the airfoil lift level, with respect to losses and efficiency as a basis for determination of optimal airfoil lift selection.
Skip Nav Destination
Article navigation
July 2010
Research Papers
Designing Low Pressure Turbines for Optimized Airfoil Lift
Jochen Gier,
Jochen Gier
MTU Aero Engines GmbH
, Munich D-80995, Germany
Search for other works by this author on:
Matthias Franke,
Matthias Franke
MTU Aero Engines GmbH
, Munich D-80995, Germany
Search for other works by this author on:
Norbert Hübner,
Norbert Hübner
MTU Aero Engines GmbH
, Munich D-80995, Germany
Search for other works by this author on:
Thomas Schröder
Thomas Schröder
MTU Aero Engines GmbH
, Munich D-80995, Germany
Search for other works by this author on:
Jochen Gier
MTU Aero Engines GmbH
, Munich D-80995, Germany
Matthias Franke
MTU Aero Engines GmbH
, Munich D-80995, Germany
Norbert Hübner
MTU Aero Engines GmbH
, Munich D-80995, Germany
Thomas Schröder
MTU Aero Engines GmbH
, Munich D-80995, GermanyJ. Turbomach. Jul 2010, 132(3): 031008 (12 pages)
Published Online: March 25, 2010
Article history
Received:
September 1, 2008
Revised:
April 1, 2009
Online:
March 25, 2010
Published:
March 25, 2010
Citation
Gier, J., Franke, M., Hübner, N., and Schröder, T. (March 25, 2010). "Designing Low Pressure Turbines for Optimized Airfoil Lift." ASME. J. Turbomach. July 2010; 132(3): 031008. https://doi.org/10.1115/1.3148476
Download citation file:
Get Email Alerts
Experimental Investigation of Mode-Frequency Scattering at Fan Stages
J. Turbomach (September 2024)
Axial Compressor Transonic Rotor Shock Interaction With Upstream Stator Row
J. Turbomach (September 2024)
Endwall Contouring for Improving Aerodynamic Performance in a High-Pressure Turbine Cascade
J. Turbomach (October 2024)
Related Articles
Aerodesign and Testing of an Aeromechanically Highly Loaded LP Turbine
J. Turbomach (October,2006)
A Study of Advanced High-Loaded Transonic Turbine Airfoils
J. Turbomach (October,2006)
Surface Shear Stress and Pressure Measurements in a Turbine Cascade
J. Turbomach (July,2009)
Transonic Aerodynamic Losses Due to Turbine Airfoil, Suction Surface Film Cooling
J. Turbomach (April,2000)
Related Proceedings Papers
Related Chapters
Detailed Airfoil Design for Axial-Flow Turbines
Turbine Aerodynamics: Axial-Flow and Radial-Flow Turbine Design and Analysis
Performance Testing of Combined Cycle Power Plant
Handbook for Cogeneration and Combined Cycle Power Plants, Second Edition
Outlook
Closed-Cycle Gas Turbines: Operating Experience and Future Potential