TY - JOUR
T1 - A simultaneous use of a leading-edge fillet and a non-axisymmetrically contoured endwall in a turbine stage
AU - Turgut, Özhan H.
AU - Camci, Cengiz
N1 - Funding Information:
The authors acknowledge the financial support provided by Siemens Energy Inc., Orlando. They thank Dr. Matthew Montgomery, Dr. Prakash Chander, Dr. Michael Crawford, Andrew Lohaus, Anthony Malandra, Ching-Pang Lee, Boris Dobrzynski, Humberto Zuniga, Ken Landis, and Dirk Nuernberger. The authors are thankful to Dr. Ali Akturk for his support during this study. This paper's experimental and computational results were initially presented at an ASME conference in Copenhagen, Denmark (GT2012-69304). Permission from the ASME Publications Department was granted to publish an extended version of this material in a non-ASME Journal. The authors are also indebted to Dr. Peter R. Eiseman of Program Development Company, LLC for his great help in grid development for our study. M. Catalano and K. Heller were extremely helpful in high-performance-computing support during the study.
Funding Information:
The authors acknowledge the financial support provided by Siemens Energy Inc. , Orlando. They thank Dr. Matthew Montgomery, Dr. Prakash Chander, Dr. Michael Crawford, Andrew Lohaus, Anthony Malandra, Ching-Pang Lee, Boris Dobrzynski, Humberto Zuniga, Ken Landis, and Dirk Nuernberger. The authors are thankful to Dr. Ali Akturk for his support during this study. This paper's experimental and computational results were initially presented at an ASME conference in Copenhagen, Denmark (GT2012-69304). Permission from the ASME Publications Department was granted to publish an extended version of this material in a non-ASME Journal. The authors are also indebted to Dr. Peter R. Eiseman of Program Development Company, LLC for his great help in grid development for our study. M. Catalano and K. Heller were extremely helpful in high-performance-computing support during the study.
Publisher Copyright:
© 2021 Elsevier Masson SAS
PY - 2021/11
Y1 - 2021/11
N2 - Secondary flow minimization is a crucial problem in a turbine passage. In the present paper, three different strategies are investigated to reduce the secondary-flow-related total pressure loss. These are leading-edge fillet, non-axisymmetric endwall contouring, and combining these two approaches. An experimental investigation in a single-stage turbine facility and RANS-based computations are performed to evaluate the designs. The experiments are carried out in the large-scale Axial Flow Turbine Research Facility AFTRF. A reference Flat Insert is installed on the nozzle guide vane passage's hub surface to allow future endwall design implementation during the experimental phase. The stereolithography manufactured reference insert has a constant thickness with a cylindrical shape. This investigation also uses four different leading-edge fillets, and they are attached to cylindrical Flat Insert initially. The same fillets are also attached to a contoured endwall. Simultaneous use of a leading-edge fillet and a non-axisymmetric contoured endwall for secondary flow control is the main objective of this research. Total pressure measurements are taken at the rotor inlet plane with a Kiel probe. The probe traversing is completed along one vane pitch and from 8% to 38% span. The leading-edge fillets effectively managed to weaken the horseshoe vortex occurring in front of the leading-edge. In one of the fillet cases sitting on the Flat Insert, the computational results at the NGV exit showed that the mass-averaged loss value was reduced by 1.31%. Three fillet designs decreased the area-averaged loss with a maximum reduction of 15.06%.
AB - Secondary flow minimization is a crucial problem in a turbine passage. In the present paper, three different strategies are investigated to reduce the secondary-flow-related total pressure loss. These are leading-edge fillet, non-axisymmetric endwall contouring, and combining these two approaches. An experimental investigation in a single-stage turbine facility and RANS-based computations are performed to evaluate the designs. The experiments are carried out in the large-scale Axial Flow Turbine Research Facility AFTRF. A reference Flat Insert is installed on the nozzle guide vane passage's hub surface to allow future endwall design implementation during the experimental phase. The stereolithography manufactured reference insert has a constant thickness with a cylindrical shape. This investigation also uses four different leading-edge fillets, and they are attached to cylindrical Flat Insert initially. The same fillets are also attached to a contoured endwall. Simultaneous use of a leading-edge fillet and a non-axisymmetric contoured endwall for secondary flow control is the main objective of this research. Total pressure measurements are taken at the rotor inlet plane with a Kiel probe. The probe traversing is completed along one vane pitch and from 8% to 38% span. The leading-edge fillets effectively managed to weaken the horseshoe vortex occurring in front of the leading-edge. In one of the fillet cases sitting on the Flat Insert, the computational results at the NGV exit showed that the mass-averaged loss value was reduced by 1.31%. Three fillet designs decreased the area-averaged loss with a maximum reduction of 15.06%.
UR - http://www.scopus.com/inward/record.url?scp=85113663028&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85113663028&partnerID=8YFLogxK
U2 - 10.1016/j.ast.2021.106985
DO - 10.1016/j.ast.2021.106985
M3 - Article
AN - SCOPUS:85113663028
SN - 1270-9638
VL - 118
JO - Aerospace Science and Technology
JF - Aerospace Science and Technology
M1 - 106985
ER -