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- W43697593 abstract "The flow in a horizontal shaft bulb turbine is calc ulated as a two-phase flow with a commercial Computational Fluid Dynamics (CFD-)-code including cavitation model. The results are compared with experimental results achieved at a closed loop test rig for model turbines. On the model test rig, for a certain operating poin t (i.e. volume flow, net head, blade angle, guide vane open ing) the pressure behind the turbine is lowered (i.e. the Th omacoefficient σ is lowered) and the efficiency of the turbine is recorded. The measured values can be depicted in a so-called σbreak curve or η-σdiagram. Usually, the efficiency is independent of the Thoma-coefficient up to a certai n value. When lowering the Thoma-coefficient below this value the efficiency will drop rapidly. Visual observations o f the different cavitation conditions complete the experiment. In analogy, several calculations are done for diffe rent Thoma-coefficients σ and the corresponding hydraulic losses of the runner are evaluated quantitatively. Besides, t he fraction of water vapour as an indication of the size of the ca vitation cavity is analyzed qualitatively. The experimentally and the numerically obtained res ults are compared and show a good agreement. Especially the drop in efficiency can be calculated with satisfying acc uracy. This drop in efficiency is of high practical importance since it is one criterion to determine the admissible cavitation in a bulbturbine. The visual impression of the cavitation in the CFDanalysis is well in accordance with the observed ca vitation bubbles recorded on sketches and/or photographs." @default.
- W43697593 created "2016-06-24" @default.
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- W43697593 date "2009-08-01" @default.
- W43697593 modified "2023-09-27" @default.
- W43697593 title "Cavitation in a bulb turbine" @default.
- W43697593 hasPublicationYear "2009" @default.
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