Abstract
The results of an experimental work concerning the behavior of flows with partial cavities are presented. The tests were carried out using a plano-convex foil placed in the free surface channel of the I.M.G. Hydrodynamic Tunnel. The experimental conditions concerning ambient pressure, water velocity, and body size were such that various and realistic kinds of flows could be realized. The main flow regimes are described and correlated to the values of foil incidence and cavitation parameter. Attention is paid to the shedding of large vapor pockets into the cavity wake and its possible periodic character. Aside from classical consideration to the cavity length and shedding frequency in the periodic regime, results concerning the wall pressure distribution in the rear part of the cavity are given. They lead to distinguish thin, stable, and closed cavities from the thick ones in which the reentrant jet plays a dominant role for the shedding of vortical structures and the flow unsteadiness.
Highlights
From a number of years the cavitating flow regime has become more and more accepted in hydraulic manufacturing, for example for first stage inducers of pumps used either in common industrial situation or in more advanced technology
We present here the results of an experimental study (Le Q., 1989) intended to increase the available information on the basic two-dimensional partially cavitating flows which can be encountered on most blades of hydraulic rotating machinery
The closed or open character of the cavity end, which is visible on pressure distributions, seems to be con nected to the behavior of the reentrant jet and to the cavity thickness
Summary
From a number of years the cavitating flow regime has become more and more accepted in hydraulic manufacturing, for example for first stage inducers of pumps used either in common industrial situation or in more advanced technology. Such an evolution in the industrial viewpoint involves that cavitation is taken in account from the first stage of the ma chine design. The Reynolds number is between 1 and 2.4 million so that the configuration is expected to be significant for most industrial situations
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