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Research Papers

A New Test Facility to Investigate Film Cooling on a Nonaxisymmetric Contoured Turbine Endwall—Part II: Heat Transfer and Film Cooling Measurements

[+] Author and Article Information
Johannes Kneer

Institut für Thermische Strömungsmaschinen,
Karlsruher Institut für Technologie (KIT),
Karlsruhe 76131, Germany
e-mail: johannes.kneer@kit.edu

Franz Puetz, Achmed Schulz, Hans-Jörg Bauer

Institut für Thermische Strömungsmaschinen,
Karlsruher Institut für Technologie (KIT),
Karlsruhe 76131, Germany

1Corresponding author.

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received November 17, 2015; final manuscript received December 23, 2015; published online February 17, 2016. Editor: Kenneth C. Hall.

J. Turbomach 138(7), 071004 (Feb 17, 2016) (8 pages) Paper No: TURBO-15-1266; doi: 10.1115/1.4032364 History: Received November 17, 2015; Revised December 23, 2015

The present work is part of a comprehensive heat transfer and film-cooling study on a locally cooled nonaxisymmetric contoured turbine endwall. A new test rig consisting of a linear cascade of three prismatic vanes at unity scale and exchangeable endwall has been established. The rig is operated in an open-loop configuration at a reduced main gas temperature of 425 K, an exit Mach number of 0.5, and an exit Reynolds number of 1.6 × 106. Air is used both as main gas and coolant; a realistic density ratio is achieved by cooling the coolant below freezing. In the first part of the study, aerodynamic measurements are presented. This paper concentrates on film cooling of the contoured endwall with special emphasis on data acquisition and reduction for the application of the superposition principle of film cooling. The first experimental results from thermographic measurements are discussed.

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References

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Figures

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Fig. 1

Secondary vortex system [4]

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Fig. 2

Superposition principle

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Fig. 3

Cut view of the measurement specimen

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Fig. 4

Schematic of the open-loop experimental facility and test section

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Fig. 5

Flow chart of the experimental procedure

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Fig. 6

Position of IR recording with ROI taken of endwall

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Fig. 7

High-resolution temperature map measured with IR thermography

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Fig. 8

Temperature directly upstream, directly downstream, and 25 s/D downstream of FC5 and FC6

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Fig. 9

High-resolution heat flux map calculated from temperature map

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Fig. 10

High-resolution Nusselt number map

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