Experimental investigation and computational evaluation of contoured endwall and leading edge fillet configurations in a turbine NGV

Özhan H. Turgut, Cengiz Camci

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

Secondary flow minimization is a crucial problem in a turbine passage. In the present paper, three different ways are employed to reduce the secondary flow related total pressure loss. These are nonaxisymmetric endwall contouring, leading edge (LE) fillet, and the combination of these two approaches. Experimental investigation and computational assessment are applied for the performance calculations. The experiments are carried out in an annular Axial Flow Turbine Research Facility (AFTRF) having a diameter of 91.66cm. For the experimental measurement comparison, a reference Flat Insert is installed in the nozzle guide vane (NGV) passage. It has a constant thickness with cylindrical surface and is manufactured by stereolithography (SLA) method. Also, Flat Insert has a backward facing step at the NGV exit, and the effect of this step is analyzed computationally. Four different LE fillets are designed, and they are attached to both cylindrical Flat Insert and the contoured endwall. Total pressure measurements are taken at rotor inlet plane with Kiel probe. The probe traversing is completed with one vane pitch and from 8% to 38% span. For one of the designs, areaaveraged loss is reduced by 15.06%. The simulation estimated this reduction as 6.95%. Computational evaluation is also performed at the NGV exit plane. The most effective design reduced the mass-averaged loss by 1.84% on the whole passage. The computational study did not include the rim seal flow between the vane and rotor domain and also rotor simulation was absent. The difference between the measurements and the simulation comes from these two important effects.

Original languageEnglish (US)
Title of host publicationASME Turbo Expo 2012
Subtitle of host publicationTurbine Technical Conference and Exposition, GT 2012
Pages1443-1458
Number of pages16
EditionPARTS A, B, AND C
DOIs
StatePublished - Dec 1 2012
EventASME Turbo Expo 2012: Turbine Technical Conference and Exposition, GT 2012 - Copenhagen, Denmark
Duration: Jun 11 2012Jun 15 2012

Publication series

NameProceedings of the ASME Turbo Expo
NumberPARTS A, B, AND C
Volume8

Other

OtherASME Turbo Expo 2012: Turbine Technical Conference and Exposition, GT 2012
CountryDenmark
CityCopenhagen
Period6/11/126/15/12

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All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Turgut, Ö. H., & Camci, C. (2012). Experimental investigation and computational evaluation of contoured endwall and leading edge fillet configurations in a turbine NGV. In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition, GT 2012 (PARTS A, B, AND C ed., pp. 1443-1458). (Proceedings of the ASME Turbo Expo; Vol. 8, No. PARTS A, B, AND C). https://doi.org/10.1115/GT2012-69304