Abstract
The paper deals with the development of experimental benches designed with the aim of producing test cases of transients flow through different types of junctions both in non-cavitating and cavitating conditions. The non-cavitating test cases consist in a rapid depressurization of a reservoir to which a pipe network containing the junction is connected while in the cavitating test cases the same pipe network is discharged towards an open-air reservoir by means of an ad hoc very rapid opening valve apparatus. First of all the experimental data allowed for a deeper insight on the subject from a phenomenological point of view. Then the recorded pressure time histories have been used to validate the numerical results of a code which solves the flow by means of a 1D model suitable to describe unsteady friction and cavitating phenomena. In the code the discrete gas-cavity model (DGCM) introduced by Provoost and Wylie is integrated in the method of characteristics and the junctions are modeled using a standard constant pressure approach improved with the gas cavity model.
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