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Research Papers

Development of a Steady-State Experimental Facility for the Analysis of Double-Wall Effusion Cooling Geometries

[+] Author and Article Information
Alexander V. Murray

Department of Engineering Science,
University of Oxford,
Oxford OX1 3PJ, UK
e-mail: alexander.murray@eng.ox.ac.uk

Peter T. Ireland

Department of Engineering Science,
University of Oxford,
Oxford OX1 3PJ, UK
e-mail: peter.ireland@eng.ox.ac.uk

Eduardo Romero

Turbine Systems,
Rolls-Royce plc.,
Bristol BS34 7QE, UK
e-mail: eduardo.romero@rolls-royce.com

1Corresponding author.

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received September 22, 2018; final manuscript received October 15, 2018; published online January 21, 2019. Editor: Kenneth Hall.

J. Turbomach 141(4), 041008 (Jan 21, 2019) (10 pages) Paper No: TURBO-18-1265; doi: 10.1115/1.4041751 History: Received September 22, 2018; Revised October 15, 2018

The continuous drive for ever higher turbine entry temperatures is leading to considerable interest in high performance cooling systems which offer high cooling effectiveness with low coolant utilization. The double-wall system is an optimized amalgamation of more conventional cooling methods including impingement cooling, pedestals, and film cooling holes in closely packed arrays characteristic of effusion cooling. The system comprises two walls, one with impingement holes, and the other with film holes. These are mechanically connected via pedestals allowing conduction between the walls while increasing coolant-wetted area and turbulent flow. However, in the open literature, experimental data on such systems are sparse. This study presents a new experimental heat transfer facility designed for investigating double-wall systems. Key features of the facility are discussed, including the use of infrared thermography to obtain overall cooling effectiveness measurements. The facility is designed to achieve Reynolds and Biot (to within 10%) number similarity to those seen at engine conditions. The facility is used to obtain overall cooling effectiveness measurements for a circular pedestal, double-wall test piece at three coolant mass-flows. A conjugate computational fluid dynamics (CFD) model of the facility was developed providing insight into the internal flow features. Additionally, a computationally efficient, decoupled conjugate method developed by the authors for analyzing double-wall systems is run at the experimental conditions. The results of the simulations are encouraging, particularly given how computationally efficient the method is, with area-weighted, averaged overall effectiveness within a small margin of those obtained from the experimental facility.

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References

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Figures

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Fig. 1

Double-wall cooled turbine blade concept

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Fig. 2

Section view schematic showing the side of the experimental facility

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Fig. 3

Isometric section view of the experimental facility with a number of features enlarged

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Fig. 4

One-dimensional vertical traverse of the test section, 6Df upstream of the test piece at mainstream experimental test conditions

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Fig. 5

Difference in individual thermocouple reading from the average increase in temperature measured by all nine thermocouples, where their locations are shown by the crosses

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Fig. 6

Basic repeating pedestal geometry unit (termed the unit cell) under investigation

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Fig. 7

Graphic showing the domain enlargement and coupling of the external and internal cooling methods forming the final thermal profile

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Fig. 8

Experimental overall effectiveness contours for coolant m* = 1.52. (Top) Displays the external surface of the effusion wall and (bottom) external surface of the impingement wall.

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Fig. 9

Normalized velocity contours, with vectors at both the midpedestal plane (top) and across the horizontal center of the test piece (bottom) for the m* = 1.52 test case

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Fig. 10

Overall effectiveness contours from the fully conjugate rig CFD (left) and decoupled conjugate CFD method (right). (Top) Displays the external surface of the effusion wall and (bottom) external surface of the impingement wall.

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Fig. 11

Area-weighted averaged overall effectiveness from the experiments and both CFD methods

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