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The performance of engineering components and structures is strongly influenced by the interaction between design, manufacture and materials. This paper presents the fracture of copper lamellas from a circular collector. The investigated circular collector, having 315 copper lamellas, is one of the main parts of an electric motor. The fracture of the copper lamellas was observed in normal operation...
The decelerated swirling flow in the draft tube cone of Francis turbines is a complex hydrodynamic phenomenon, particularly when the turbine is operated at partial discharge. In this case, the self-induced instability of an incoming steady axisymmetric swirling flow evolves into a three-dimensional unsteady flow field, with precessing helical vortex (also called vortex rope) and associated severe...
The paper presents preliminary results of a work in progress addressing the hydrodynamic stability of swirling flows problems in ducts with variable radius which imply mathematical modeling, dynamic and stability investigations. The proposed quasi‐analytical method aims to obtain the velocity profiles with a low order approximation method of which the computation costs were neglijable and regain the...
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