Modellazione matematica delle oscillazioni di pressione nella pressurizzazione di un condotto fognario

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Abstract

[automatically translated] It examines the transitional pressurization of a sewer, a phenomenon quite common in urban drainage networks. During this transitional materialize the intense pressure fluctuations, even usually interpreted as "water hammer" and believed to be able to re-damage the network. The nature of these oscillations is not yet clear, although they are generally recognized, with no defined mode, the interference between the liquid stream and the air sacs of considerable dimen-sions imprisoned by the liquid stream against the sky of the duct. In this memory, based on previous laboratory experiments, it deals with the mathematical modeling of the complex phenomenon, and in particular of pressure fluctuations. For the filling phase of the pipeline will adopt me-todo of the rigid column, which proved effective in previous studies of writers. For the subsequent phase of the motion stabilization, during which occur the pressure oscillations, they consider two models. The first, according to what is assumed in the technical literature, considers the oscillations but-like manifestations of a water hammer phenomenon, and then uses the known equations of the oscillations that a resiliently-compressible liquid column. The second, however, considers the oscillations as-produced by the pulsations of the air pockets during their migration along the pipeline, and match the equations of the rigid column, to the liquid phase, with those of the polytropic transformation, for the gaseous phase . This latest model, than the other; it proves very effective in the simulation of the oscillation-ni, while providing a clear indication of the true nature of the oscillations in question. Spe-cific numerical essays allow you to recognize the influence of the air sacs of the characteristics of those oscillations. The abovementioned results provide explanations of physical character.
Original languageItalian
Pages1-15
Number of pages0
Publication statusPublished - 2006

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