International Journal of Fluid Machinery and Systems
Online ISSN : 1882-9554
ISSN-L : 1882-9554
Original Papers
Experimental Study and Numerical Simulation of Cavity Oscillation in a Conical Diffuser
Changkun ChenChristophe NicoletKoichi YonezawaMohamed FarhatFrancois AvellanKazuyoshi MiyagawaYoshinobu Tsujimoto
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2010 Volume 3 Issue 1 Pages 91-101

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Abstract

Based on the one-dimensional stability analysis, the self-excited oscillation in hydraulic power generating systems was studied by a simple experiment and numerical simulation. It was shown that a cavity in a conical diffuser can cause surge. With the diffuser, a high amplitude and low frequency oscillation occurs at low cavitation number. This oscillation was not observed with the straight pipe. It was confirmed that the diffuser effect of the draft tube can be the cause of the full load surge in hydraulic power system. Numerical results were also analyzed to check the validity of the one-dimensional stability analysis.

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© 2010 Turbomachinery Society of Japan, Korean Fluid Machinery Association, Chinese Society of Engineering Thermophysics, IAHR
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