This paper presents the reasoning for and the design process of contouring a high lift front-loaded low pressure turbine (LPT) airfoil near the endwall to reduce the endwall loss. The test airfoil, L2F, was designed to the approximate gas angles with 38% larger pitchwise spacing than the widely studied Pack B airfoil. Being more front-loaded with a higher stagger angle, L2F is shown to produce more endwall losses than Pack B. It is suggested that the high endwall loss of L2F is due to the high stagger angle, not front-loading, as usually suggested in the literature. A procedure is presented to approximate the front-loading and stall resistance of L2F and obtain a low stagger version of that airfoil, designated as L2F-LS. A contoured airfoil is then designed by transitioning L2F into L2F-LS at the endwall to obtain a benefit from the reduced stagger angle at the endwall. Due to the contouring process generating a fillet, the contoured airfoil is referred to as L2F-EF (“endwall fillet”). Predictions in this paper suggest endwall loss reductions between 17% and 24% at Re = 100,000. Linear cascade experiments in Part II of this paper indicate that L2F-EF reduces endwall losses more than 20% compared to L2F. The overall conclusion is that the stagger angle has a significant effect on endwall loss and should be considered for designing high lift LPT airfoils at the endwall.
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Air Force Research Laboratory,
Wright Patterson AFB, OH 45433
e-mail: michael.lyall@us.af.mil
Wright Patterson AFB, OH 45433
e-mail: paul.king@us.edu
Air Force Research Laboratory,
Wright Patterson AFB, OH 45433
e-mail: john.clark.38@us.af.mil
Air Force Research Laboratory,
Wright Patterson AFB, OH 45433
e-mail: rolf.sondergaard@us.af.mil
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August 2014
Research-Article
Endwall Loss Reduction of High Lift Low Pressure Turbine Airfoils Using Profile Contouring—Part I: Airfoil Design
M. Eric Lyall,
Air Force Research Laboratory,
Wright Patterson AFB, OH 45433
e-mail: michael.lyall@us.af.mil
M. Eric Lyall
Aerospace Systems Directorate
,Air Force Research Laboratory,
1950 Fifth Street
,Wright Patterson AFB, OH 45433
e-mail: michael.lyall@us.af.mil
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Paul I. King,
Wright Patterson AFB, OH 45433
e-mail: paul.king@us.edu
Paul I. King
Air Force Institute of Technology
,2950 Hobson Way, Building 641
,Wright Patterson AFB, OH 45433
e-mail: paul.king@us.edu
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John P. Clark,
Air Force Research Laboratory,
Wright Patterson AFB, OH 45433
e-mail: john.clark.38@us.af.mil
John P. Clark
Aerospace Systems Directorate
,Air Force Research Laboratory,
1950 Fifth Street
,Wright Patterson AFB, OH 45433
e-mail: john.clark.38@us.af.mil
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Rolf Sondergaard
Air Force Research Laboratory,
Wright Patterson AFB, OH 45433
e-mail: rolf.sondergaard@us.af.mil
Rolf Sondergaard
Aerospace Systems Directorate
,Air Force Research Laboratory,
1950 Fifth Street
,Wright Patterson AFB, OH 45433
e-mail: rolf.sondergaard@us.af.mil
Search for other works by this author on:
M. Eric Lyall
Aerospace Systems Directorate
,Air Force Research Laboratory,
1950 Fifth Street
,Wright Patterson AFB, OH 45433
e-mail: michael.lyall@us.af.mil
Paul I. King
Air Force Institute of Technology
,2950 Hobson Way, Building 641
,Wright Patterson AFB, OH 45433
e-mail: paul.king@us.edu
John P. Clark
Aerospace Systems Directorate
,Air Force Research Laboratory,
1950 Fifth Street
,Wright Patterson AFB, OH 45433
e-mail: john.clark.38@us.af.mil
Rolf Sondergaard
Aerospace Systems Directorate
,Air Force Research Laboratory,
1950 Fifth Street
,Wright Patterson AFB, OH 45433
e-mail: rolf.sondergaard@us.af.mil
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received August 23, 2013; final manuscript received September 24, 2013; published online January 31, 2014. Editor: Ronald Bunker.
J. Turbomach. Aug 2014, 136(8): 081005 (9 pages)
Published Online: January 31, 2014
Article history
Received:
August 23, 2013
Revision Received:
September 24, 2013
Citation
Eric Lyall, M., King, P. I., Clark, J. P., and Sondergaard, R. (January 31, 2014). "Endwall Loss Reduction of High Lift Low Pressure Turbine Airfoils Using Profile Contouring—Part I: Airfoil Design." ASME. J. Turbomach. August 2014; 136(8): 081005. https://doi.org/10.1115/1.4025951
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