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

Yonezawa, Koichi; Konishi, Daisuke; Miyagawa, Kazuyoshi; Avellan, Francois; Doerfler, Peter; Tsujimoto, Yoshinobu

doi:http://dx.doi.org/10.5293/IJFMS.2012.5.4.152

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자료유형: 학술저널

저자정보: Yonezawa, Koichi Konishi, Daisuke Miyagawa, Kazuyoshi Avellan, Francois Doerfler, Peter Tsujimoto, Yoshinobu

저널정보: 한국유체기계학회 International Journal of Fluid Machinery and Systems International Journal of Fluid Machinery and Systems Vol.5 No.4

발행연도: 2012.12

수록면: 152 - 160 (9page)

DOI: http://dx.doi.org/10.5293/IJFMS.2012.5.4.152

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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.

#cavitation #Draft tube surge #hydro turbine

참고문헌 (7)

참고문헌 신청

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Chen, C. / 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(3):260~268

Chen, C. / 2010 / Experimental Study and Numerical Simulation of Cavity Oscillation in a Diffuser with Swirling Flow / International Journal of Fluid Machinery and Systems 3(1):80~90

Chen, C. / 2010 / Experimental Study and Numerical Simulation of Cavity Oscillation in a Conical Diffuser / International Journal of Fluid Machinery and Systems 3(1):91~101

Nishi, M. / 1984 / Surging Characteristics of Conical and Elbow Type Draft Tubes / Proc. 12th IAHR Symposium on Hydraulic Machinery and System :272~283