Long-Period Pressure Pulsation Estimated in Numerical Simulations for Excessive Flow Rate Condition of Francis Turbine

Journal of Fluids Engineering, Transactions of the ASME - Tập 136 Số 7 - 2014
Kenji Shingai1, N Okamoto2, Yasutaka Tamura3, Kiyohito Tani4
1Hitachi Research Laboratory, Hitachi, Ltd. 832-2 Horiguchi, Hitachinaka-shi, Ibaraki 312-0034, Japan e-mail:
2Shikoku Electric Power Co., Inc., 2-5 Marunouchi, Takamatsu-shi, Kagawa 760-8573, Japan
3Basic Engineering/Hydraulic Laboratory, Hitachi Mitsubishi Hydro Co., 3-2-1 Saiwai, Hitachi-shi, Ibaraki 317-0073, Japan
4Basic Engineering/Hydraulic Laboratory, Hitachi Mitsubishi Hydro Co., 3-2-1 Saiwai, Hitachi-shi, Ibaraki 317-0073, Japan e-mail:

Tóm tắt

A series of numerical simulations for a Francis turbine were carried out to estimate the unsteady motion of the cavity in the draft tube of the turbine under a much larger flow rate condition than the swirl-free flow rate. The evaporation and condensation process was described by using a simplified Rayleigh–Plesset equation. A two-phase homogeneous model was adopted to calculate the mixture of gas and liquid phases. Instantaneous pressure monitored at a point on the draft tube formed long-period pulsations. Detailed analysis of the simulation results clarified the occurrence of a uniquely shaped cavity and the corresponding flow pattern in every period of the pressure pulsations. The existence of a uniquely shaped cavity was verified with an experimental approach. A simulation without rotor-stator interaction also obtained long-period pulsations after an extremely long computational time. This result shows that the rotor-stator interaction does not contribute to the excitation of long-period pulsations.

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Tài liệu tham khảo

2008, One-Dimensional Analysis of Full Load Draft Tube Surge, ASME J. Fluids Eng., 130, 041106, 10.1115/1.2903475

Sick, M., Doerfler, P., Sallaberger, M., Lohmberg, A., and Casey, M., 2002, “CFD Simulation of the Draft Tube Vortex,” Proc. 21st IAHR Symp. Hydraulic Machinery & Systems, Lausanne, Switzerland, Paper No. 32, pp. 1–9.

2007, Experimental Study and Numerical Simulation of the FLINDT Draft Tube Rotating Vortex, ASME J. Fluids Eng., 129, 146, 10.1115/1.2409332

2008, Analysis of the Cavitating Draft Tube Vortex in a Francis Turbine Using Particle Image Velocimetry Measurements in Two-Phase Flow, ASME J. Fluids Eng., 130, 021105, 10.1115/1.2813052

2012, Evaluation of a Francis Turbine Draft Tube Flow at Part Load Using Hybrid RANS-LES Turbulence Modelling, IOP Conf. Ser. Earth Env. Sci., 15, 062010, 10.1088/1755-1315/15/6/062010

Kurokawa, J., Kajigaya, A., Matsui, J., and Imamura, H., 2000, “Suppression of Swirl in a Conical Diffuser by Use of J-Groove,” Proc. 20th IAHR Symp. Hydraulic Machinery & Systems, Charlotte, NC.

Susan-Resiga, R., Muntean, S., Vu, T. C., Ciocan, G. D., and Nennemann, B., 2006, “Jet Control of the Draft Tube Vortex Rope in Francis Turbines at Partial Discharge,” Proc. 23rd IAHR Symp. Hydraulic Machinery & Systems, Yokohama, Japan, Paper No. F192.

2010, Effect of J-Groove on the Suppression of Swirl Flow in a Conical Diffuser, ASME J. Fluids Eng., 132, 071101, 10.1115/1.4001899

2010, Mitigation of Pressure Fluctuations in the Discharge Cone of Hydraulic Turbines Using Flow-Feedback, IOP Conf. Ser. Earth Env. Sci., 12, 012067, 10.1088/1755-1315/12/1/012067

Koutnik, J., Nicolet, C., Schohl, G. A., and Avellan, F., 2006, “Overload Surge Event in a Pumped-Storage Power Plant,” Proc. 23rd IAHR Symp. Hydraulic Machinery & Systems, Yokohama, Japan, Paper No. F135.

2010, Prediction of a Francis Turbine Prototype Full Load Instability From Investigations on the Reduced Scale Model, IOP Conf. Ser. Earth Env. Sci., 12, 012025, 10.1088/1755-1315/12/1/012025

2010, Francis Full-Load Surge Mechanism Identified by Unsteady 2-Phase CFD, IOP Conf. Ser. Earth Env. Sci., 12, 012026, 10.1088/1755-1315/12/1/012026

2010, Experimental Study and Numerical Simulation of Cavity Oscillation in a Diffuser With Swirling Flow, Int. J. Fluid Mach. Syst., 3, 80, 10.5293/IJFMS.2010.3.1.080

2010, Experimental Study and Numerical Simulation of Cavity Oscillation in a Conical Diffuser, Int. J. Fluid Mach. Syst., 3, 91, 10.5293/IJFMS.2010.3.1.091

2012, Cavitation Surge in a Small Model Test Facility Simulating a Hydraulic Power Plant, Int. J. Fluid Mach. Syst., 5, 152, 10.5293/IJFMS.2012.5.4.152

1999, Hydraulic Turbines, Storage Pumps and Pump-Turbines—Model Acceptance Tests

1996, Correlation of Swirl Number for a Radial-Type Swirl Generator, Experiment. Therm. Fluid Sci., 12, 444, 10.1016/0894-1777(95)00135-2

1994, Two-Equation Eddy-Viscosity Turbulence Models for Engineering Applications, AIAA J., 32, 1598, 10.2514/3.12149

1979

Zwart, P. J., Gerber, A. G., and Belamri, T., 2004, “A Two-Phase Flow Model for Predicting Cavitation Dynamics,” Proc. International Conf. Multiphase Flow 2004, Yokohama, Japan, Paper No. 152.

2005, Fundamentals of Multiphase Flows, 220

2011, Thermo-Fluid Dynamics of Two-Phase Flow, 2nd ed., 393

2012, Mathematical Model of Cavitation and Modelling of Fluid Flow in Cone, Procedia Eng., 39, 9, 10.1016/j.proeng.2012.07.002

Kato, C., 2011, “Industry-University Collaborative Project on Numerical Predictions of Cavitating Flows in Hydraulic Machinery: Part 1—Benchmark Test on Cavitating Hydrofoils,” Proc. ASME-JSME-KSME 2011 Joint Fluids Eng. Conf., Hamamatsu, Japan, pp. 445–453.

2012, Numerical Predictions of Cavitating Flow Around Model Scale Propellers by CFD and Advanced Model Calibration, Int. J. Rotating Machinery, 2012, 618180

Zobeiri, A., Kueny, J. L., Farhat, M., and Avellan, F., 2006, “Pump-Turbine Rotor-Stator Interactions in Generating Mode: Pressure Fluctuation in Distributor Channel,” Proc. 23rd IAHR Symp. Hydraulic Machinery & Systems, Yokohama, Japan, Paper No. F235.

1999, Hydraulic Turbines—Basic Principles and State-of-the-Art Computational Fluid Dynamics Applications, Proc. IMechE C, 213, 85, 10.1243/0954406991522202

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Journal of Fluids Engineering, Transactions of the ASME

Tập 136 Số 7

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