International Journal of Fluid Machinery and Systems

한국유체기계학회 (Korean Society for Fluid machinery)
권호 표지
DOI QR코드

DOI QR Code

Cavitation Surge in a Small Model Test Facility simulating a Hydraulic Power Plant

  • 투고 : 2012.05.28
  • 심사 : 2012.08.26
  • 발행 : 2012.12.31
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

Model tests and CFD were carried out to find out the cause of cavitation surge in hydraulic power plants. In experiments the cavitation surge was observed at flow rate, both with and without a surge tank placed just upstream of the inlet volute. The surge frequency at smaller flow rate was much smaller than the swirl mode frequency caused by the whirl of vortex rope. An unsteady CFD was carried out with two boundary conditions: (1) the flow rate is fixed to be constant at the volute inlet, (2) the total pressure is kept constant at the volute inlet, corresponding to the experiments without/with the surge tank. The surge was observed with both boundary conditions at both higher and lower flow rates. Discussions as to the cause of the surge are made based on additional tests with an orifice at the diffuser exit, and with the diffuser replaced with a straight pipe.

키워드

참고문헌

  1. Chen, C., Nicolet, C., Yonezawa, K., Farhat, M., Avellan F., and Tsujimoto, Y., 2008, "One-Dimensional Analysis of Full Load Draft Tube Surge", Journal of Fluids Engineering, 130, Issue 4.
  2. Chen, C., Nicolet, C., Yonezawa, K., Farhat, M., Avellan F., and Tsujimoto, Y., 2009, "One-Dimensional Analysis of Full Load Draft Tube Surge Considering the Finite Sound Velocity in the Penstock", International Journal of Fluid Machinery and Systems, 2, No. 3, 260-268. https://doi.org/10.5293/IJFMS.2009.2.3.260
  3. Chen, C., Nicolet, C., Yonezawa, K., Farhat, M., Avellan F., and Tsujimoto, Y., 2010, "Experimental Study and Numerical Simulation of Cavity Oscillation in a Diffuser with Swirling Flow", International Journal of Fluid Machinery and Systems, Vol. 3, No. 1, 80-90. https://doi.org/10.5293/IJFMS.2010.3.1.080
  4. Chen, C., Nicolet, C., Yonezawa, K., Farhat, M., Avellan F., and Tsujimoto, Y., 2010, "Experimental Study and Numerical Simulation of Cavity Oscillation in a Conical Diffuser", International Journal of Fluid Machinery and Systems, 3, No. 1, 91-101. https://doi.org/10.5293/IJFMS.2010.3.1.091
  5. Nishi, M., Surging Characteristics of Conical and Elbow Type Draft Tubes, Proc. 12th IAHR Symposium on Hydraulic Machinery and System, Stirling (1984), 272-283.
  6. Doerfler, P. K., Francis Turbine Surge Prediction and Prevention, Proc. Waterpower' 85(1985), 952-961.
  7. Doerfler, P.K., Keller, M., and Braun, O., 2010, "Francis full-load surge mechanism identified by unsteady 2-phase CFD," IAHR 25th Symp. On Hydr. Mach. Systems, Timisoara, 2010.

피인용 문헌

  1. Draft tube discharge fluctuation during self-sustained pressure surge: fluorescent particle image velocimetry in two-phase flow vol.54, pp.4, 2013, https://doi.org/10.1007/s00348-013-1514-6
  2. Cavitation surge modelling in Francis turbine draft tube vol.52, pp.3, 2014, https://doi.org/10.1080/00221686.2013.854847
  3. Suppression of unsteady swirl flow in the draft tube of a Francis hydro turbine model using J-Groove vol.31, pp.12, 2017, https://doi.org/10.1007/s12206-017-1123-z
  4. Experimental evidence of inter-blade cavitation vortex development in Francis turbines at deep part load condition vol.58, pp.10, 2017, https://doi.org/10.1007/s00348-017-2421-z
  5. Cavitation instabilities in hydraulic machines vol.52, pp.1, 2013, https://doi.org/10.1088/1757-899X/52/1/012005
  6. Long-Period Pressure Pulsation Estimated in Numerical Simulations for Excessive Flow Rate Condition of Francis Turbine vol.136, pp.7, 2014, https://doi.org/10.1115/1.4026584
  7. Measurement of the Self-Oscillating Vortex Rope Dynamics for Hydroacoustic Stability Analysis vol.138, pp.2, 2016, https://doi.org/10.1115/1.4031778
  8. Comparison of three kinds of sensors used to identify the incipient cavitation vol.38, pp.1, 2018, https://doi.org/10.1108/SR-05-2017-0078