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Research Papers: Gas Turbines: Turbomachinery

Particle Image Velocimetry Measurement and Computational Fluid Dynamic Simulations of the Unsteady Flow Within a Rotating Disk Cavity

[+] Author and Article Information
Xiang Luo

National Key Laboratory of Science and
Technology on Aero-Engine Aero-Thermodynamics,
Beihang University,
Haidian District,
Beijing 100191, China
e-mail: xiang.luo@buaa.edu.cn

Dongdong Liu

National Key Laboratory of Science and
Technology on Aero-Engine Aero-Thermodynamics,
Beihang University,
Haidian District,
Beijing 100191, China
e-mail: liudongdongbuaa@gmail.com

Hongwei Wu

Institute of Engineering and Energy Technologies,
School of Engineering,
University of the West of Scotland,
Paisley PA1 2BE, UK
e-mail: hongwei.wu@uws.ac.uk

Zhi Tao

National Key Laboratory of Science and
Technology on Aero-Engine Aero-Thermodynamics,
Beihang University,
Haidian District,
Beijing 100191, China
e-mail: tao_zhi@buaa.edu.cn

1Corresponding authors.

Contributed by the Turbomachinery Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received March 16, 2014; final manuscript received April 12, 2014; published online May 16, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(11), 112601 (May 16, 2014) (6 pages) Paper No: GTP-14-1156; doi: 10.1115/1.4027568 History: Received March 16, 2014; Revised April 12, 2014

In this article a combined experimental and numerical investigation of the unsteady mixing flow of the ingestion gas and rim sealing air inside a rotating disk cavity was carried out. A new test rig was set up, and the experiments were conducted on a 1.5-stage turbine rotor disk and included pressure measurements. The flow structure of the mixing region of the ingestion gas and sealing air in cavity was measured using the particle image velocimetry (PIV) technique. To complement the experimental investigation and to aid in understanding the flow mechanism within the cavity, a three-dimensional (3D) unsteady computational fluid dynamic (CFD) analysis was undertaken. Both simulated and experimental results indicated that near the rotating disk, (i) a large amount of the ingestion gas will turn around and flow out the cavity due to the impact of the centrifugal force and the Coriolis force, (ii) a small amount of ingestion gas will mix transiently with the sealing air inside the cavity, whereas near the static disk, (iii) the ingestion gas will flow into the cavity along the static wall and mix with the sealing air.

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References

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Figures

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Fig. 1

The overall layout of the experimental system

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Fig. 2

Cross section of test rig arrangement

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Fig. 3

Computational domain for one vane and one blade

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Fig. 4

Computational mesh

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Fig. 5

Comparison of calculated and measured dimensionless mean pressure in the outer casing behind guide vanes

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Fig. 6

Comparison of calculated and measured velocity vector in the highlighted area in section A at different time steps

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Fig. 7

Variation of the radial and circumferential velocity along line B

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Fig. 8

Streamline and radial velocity contour in surface A for the case of ingestion

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Fig. 9

Streamline and contour of tracer particle concentration in r-z plane for the case of ingestion

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