Research Papers

Volumetric Velocimetry Measurements of Film Cooling Jets

[+] Author and Article Information
Artur Joao Carvalho Figueiredo

Department of Mechanical Engineering,
University of Bath,
Bath BA2 7AY, UK
e-mail: ajcbsd20@bath.ac.uk

Robin Jones

Department of Mechanical Engineering,
University of Bath,
Bath BA2 7AY, UK
e-mail: R.R.Jones@bath.ac.uk

Oliver J. Pountney

Department of Mechanical Engineering,
University of Bath,
Bath BA2 7AY, UK
e-mail: O.J.Pountney@bath.ac.uk

James A. Scobie

Department of Mechanical Engineering,
University of Bath,
Bath BA2 7AY, UK
e-mail: J.A.Scobie@bath.ac.uk

Gary D. Lock

Department of Mechanical Engineering,
University of Bath,
Bath BA2 7AY, UK
e-mail: G.D.Lock@bath.ac.uk

Carl M. Sangan

Department of Mechanical Engineering,
University of Bath,
Bath BA2 7AY, UK
e-mail: C.M.Sangan@bath.ac.uk

David J. Cleaver

Department of Mechanical Engineering,
University of Bath,
Bath BA2 7AY, UK
e-mail: D.J.Cleaver@bath.ac.uk

1Corresponding author.

Manuscript received July 6, 2018; final manuscript received July 26, 2018; published online October 17, 2018. Editor: Jerzy T. Sawicki.

J. Eng. Gas Turbines Power 141(3), 031021 (Oct 17, 2018) (13 pages) Paper No: GTP-18-1453; doi: 10.1115/1.4041206 History: Received July 06, 2018; Revised July 26, 2018

This paper presents volumetric velocimetry (VV) measurements for a jet in crossflow that is representative of film cooling. VV employs particle tracking to nonintrusively extract all three components of velocity in a three-dimensional volume. This is its first use in a film-cooling context. The primary research objective was to develop this novel measurement technique for turbomachinery applications, while collecting a high-quality data set that can improve the understanding of the flow structure of the cooling jet. A new facility was designed and manufactured for this study with emphasis on optical access and controlled boundary conditions. For a range of momentum flux ratios from 0.65 to 6.5, the measurements clearly show the penetration of the cooling jet into the freestream, the formation of kidney-shaped vortices, and entrainment of main flow into the jet. The results are compared to published studies using different experimental techniques, with good agreement. Further quantitative analysis of the location of the kidney vortices demonstrates their lift off from the wall and increasing lateral separation with increasing momentum flux ratio. The lateral divergence correlates very well with the self-induced velocity created by the wall–vortex interaction. Circulation measurements quantify the initial roll up and decay of the kidney vortices and show that the point of maximum circulation moves downstream with increasing momentum flux ratio. The potential for nonintrusive VV measurements in turbomachinery flow has been clearly demonstrated.

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Fig. 1

Film cooling flow structures ([1])

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Fig. 3

Illustration of the film cooling rig

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Fig. 4

Different plates used in the film cooling rig: (a) static taps (left), (b) VV (center), and (c) hot-wire (right)

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Fig. 5

Film cooling holes geometry

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Fig. 6

Commissioning results

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Fig. 7

Comparison of S-PIV [13] and VV at x/D = 4

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Fig. 8

x/D = 6 for all cases

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Fig. 9

x/D = 2, 4, 6, and 8 (top) and y/D = 0 (bottom) for IR = 0.65, 1.6, 3.5, and 6.5

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Fig. 10

Isosurfaces of u/U = 1.00 (top) and ωx = ±0.15, ±0.20, ±0.25 (bottom) for IR = 0.65, 1.6, 3.5, and 6.5

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Fig. 11

Vortex core location (x/D, y/D, z/D) and circulation Γ for IR = 0.65, 1.6, 3.5, and 6.5



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