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Technical Briefs

Numerical Simulation of Emergency Shutdown Process of Ring Gate in Hydraulic Turbine Runaway

[+] Author and Article Information
Juliang Xiao

e-mail: tianjinxjl@163.com

Guodong Wang

Key Laboratory of Mechanism Theory and Equipment
Design of Ministry of Education,
Tianjin University, Tianjin, 300072China

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the Journal of Fluids Engineering. Manuscript received March 9, 2012; final manuscript received October 24, 2012; published online November 20, 2012. Assoc. Editor: Frank C. Visser.

J. Fluids Eng 134(12), 124501 (Nov 20, 2012) (9 pages) doi:10.1115/1.4007971 History: Received March 09, 2012; Revised October 24, 2012

A numerical model that considers the interaction between the ring gate and its neighboring components was used to simulate the emergency shutdown process of a ring gate in hydraulic turbine runaway. The three-dimensional, unsteady Navier–Stokes equations with renormalization group (RNG) k-ε turbulence models, multiphase flow models, dynamic mesh, and sliding mesh technology were applied to model the entire flow passage of the Francis hydraulic turbine, including the spiral case, stay vanes, ring gate, guide vanes, runner, and draft tube. We present a detailed analysis on the working conditions of the turbine during its runaway quitting process, the inside and outside surface pressure distributions of the ring gate, the pressure and velocity distributions of the spiral case, stay vanes, and guide vanes at different gate openings, and the loading condition of the ring gate during its closing process. The theoretical basis for improving the dynamic quality of the transient process and for hydraulic designing and optimization is provided by analyses.

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References

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Figures

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Fig. 3

Variation curves with time of the rotating speed, shutdown percentage of the ring gate, and percentage of flow rate

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Fig. 4

Schematic of (a) the spiral case and (b) the cross section from φ = 90 deg to φ = 270 deg

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Fig. 5

Pressure (Pa) distributions at the internal and external surfaces of the ring gate at different gate-closing percentages. (a) External surface. (b) Internal surface.

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Fig. 6

Pressure and velocity distributions on the cross section from φ = 90 deg to φ = 270 deg of the ring gate at different gate-closing percentages. (a) Pressure distribution (Pa). (b) Velocity distribution (m/s).

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Fig. 7

Local enlargement of cross section φ = 90 deg for pressure and velocity distributions near the ring gate at different gate-closing percentages. (a) Pressure distribution (Pa). (b) Velocity distribution (m/s).

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Fig. 8

Downward force variation with closing percentage

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Fig. 2

Mesh schemes. (a) Mesh for the whole domain. (b) Dynamic mesh. (c) Sliding mesh.

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Fig. 1

Numerical simulation domain of the ring gate. (a) Entire flow passage model of the hydro turbine. (b) Ring gate, stay vanes, and guide vanes.

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Fig. 9

Pressure and velocity distributions on the midplane of the spiral case and guide vanes at different gate-closing percentages. (a) Pressure distribution (Pa). (b) Velocity distribution (m/s).

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Fig. 10

Pressure variations with gate-closing percentage

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