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Most of the severe erosion of hydraulic machines are found to be associated with the collapse of transient cavitation vortices downstream of a leading edge cavity. The dynamics of such a type of cavitation is investigated in a Cavitation Vortex Generator ( ...
In order to study the inlet and outlet cavitation in a Francis turbine (nq = 48) a numerical model of the bubble dynamics is established. By using the pressure and velocity distribution obtained by a 3-D potential flow analysis of the turbine, the Rayleigh ...
The two techniques, vibratory monitoring and pit counting, show promising results for the prediction of prototype cavitation erosion from model tests of Francis turbines. These cavitation detection methods are compared in two set-ups at different power lev ...
International Association For Hydraulic Research1994
Cavitation tests using models are essential to determine the full-scale machine cavitation behaviour. As erosion prediction is still very empirical, in practice a "safe" machine shows no visible cavitation on a model at sigma plant. However, this way of de ...
International Association For Hydraulic Research1990
Three different methods of cavitation erosion measurement are compared and correlated with weight loss rates in two cavitation set-ups: a high-pressure cavitation jet producing a high repetition rate of a wide range of impact intensities and a single vorte ...
Hot tear formation has been observed during the solidification of a succinonitrile–acetone (SCN-acetone) alloy by pulling the columnar dendrites in the transverse direction with a stick. It is observed that the cracking of the mushy zone (hot tears) always ...
The work presented in this paper is part of a comprehensive research effort aimed at understanding the influence of flow unsteadiness on leading edge cavitation. Pressure measurements are made on the suction side of an oscillating hydrofoil in the High-Spe ...
Experimental studies have shown that outlet cavitation of a Francis turbine is influenced by the active nuclei content of the test loop water, up to a limit curve called the saturation characteristic. To determine the importance of this influence in operat ...
International Association For Hydraulic Research1992
This paper describes a photon-counting study of the cavitation luminescence produced by flow over a hydrofoil. This has previously been identified in water saturated with xenon. The four objectives of this study are: to determine whether luminescence can be ...
The dynamics of electron bubble formation upon excitation of the A(3ss) Rydberg orbital of NO in solid Ne was studied by femtosecond pump-probe spectroscopy. The authors observe an ultrafast expansion of the bubble, followed by a vibrational recurrence in ...