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The sizing of valves and chambers for dissipating p urpose demands a study about the interaction between these elements, not only from a n operation point of view but also the whole operating range of the set, which comprehends the operating range of the valve and the dissipating chamber. The limits of liability assume a scenario where the dimensions of the chamber may be not suitable for operation of the valve, and vice-versa . This is because during dissipating energy process, major turbulences occur which may cause er osion in the dissipating structure. The interaction between the dissipating valve and t he dissipating chamber dimensions is complex because the sizing of an element is associa ted to other. Thus, the required dimensions to dissipate energy on the chamber rely on valve data, resulting in data interdependency required for adequate energy dissip ation. The set sizing must consider the operation interdep endency of both elements otherwise the system operation may be inadequate due to turbulenc e high flow velocities, which may cause cavitation and erosion of the dissipating structure s. Damages on the dissipating structure may cause energy generation interruption of hydroelectr ic power plants and accidents on the regions located downstream this structure. The adequate sizing of the set valve and dissipatin g chamber as well as the information regarding its operating range can be done with the aid of numerical simulations and physical model tests in order to predict the behavior of the prototype. Therefore, numerical simulations in CFD allow more selectivity of the cases which will be tested in a physical model, proportioning higher assertiveness on those tests.

Estudo com CFD sobre a faixa operativa da câmara de dissipação para válvulas dispersoras.