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Research Papers: Flows in Complex Systems

Numerical Investigation of Guide-Plate Induced Pressure Fluctuations on Guide Vanes of Three Gorges Turbines

[+] Author and Article Information
Ting Chen

School of Engineering,  University of Warwick, Coventry, UK, CV4 7AL

S. C. Li1

School of Engineering,  University of Warwick, Coventry, UK, CV4 7ALS.Li@warwick.ac.uk

1

Corresponding author.

J. Fluids Eng 133(6), 061101 (Jun 15, 2011) (10 pages) doi:10.1115/1.4004257 History: Received October 25, 2010; Revised May 05, 2011; Published June 15, 2011; Online June 15, 2011

A new type of cavitation triggered by boundary-layer turbulence-production has been identified from the turbines of the Three Gorges Power Station. Our previous studies point out that the addition of the ‘guide-plate’ is responsible for the increase of the turbulence level (in particular the low-frequency mode) in the free-stream which in turn promotes the boundary-layer transition through receptivity mechanism. A new vortex structure identified from our numerical studies is revealed in this paper. It explains well how the free-stream turbulence is influenced by this new vortex structure which is created by the addition of this ‘guide-plate’. These results support one of the claims in the hypothesis proposed in our previous studies. The other claims in the hypothesis about the triggering mechanism of this type of cavitation in the boundary-layer are being verified through our on-going (numerical and experimental) studies. The numerical studies reported here are performed by using CFD simulations of the entire flow passage of the prototype turbine.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Damages on the surface of guide vane: (a) position; (b) pattern

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Figure 2

Damages features: (a) wedged head; (b) corroded rough surface; (c) heated area

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Figure 3

The cross section of investigated turbine with ‘guide-plate’ structure equipped in the spiral case

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Figure 4

(a) Calculated turbine model; (b) Axial cross-sections of three models

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Figure 5

(a) Pressure fluctuations against time; (b) Pressure fluctuations against frequency with opening of 16∘

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Figure 6

(a) Pressure fluctuations against time; (b) Pressure fluctuations against frequency with opening of 35∘

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Figure 7

FFT results in the draft tube with the opening of 16∘: (a) case 1; (b) case 2; (c) case 3

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Figure 8

FFT results in the draft tube with the opening of 35∘: (a) case 1; (b) case 2; (c) case 3

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Figure 9

Calculated pressure distribution against time at fixed sections in the draft tube (Case 1 with the opening of 16∘)

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Figure 10

Calculated pressure distribution against time at fixed sections in the draft tube (Case 2 with the opening of 16∘)

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Figure 11

(a)-(c) Pressure fluctuations against time; (d)-(f) Pressure fluctuations against frequency with opening of 16∘ for three cases

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Figure 12

(a)-(c) Pressure fluctuations against time; (d)-(f) Pressure fluctuations against frequency with opening of 35∘ for three cases

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Figure 13

The structure of vortex ring at openings of (a) 16∘ and (b) 35∘

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Figure 14

(a) Vortex cores and (b) vortex pattern in the whole flow passage of turbine at openings of 16∘

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Figure 15

(a) Vortex cores and (b) Vortex pattern in the whole flow passage of turbine at openings of 35∘

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