Abstract
A new approach for identi cation of the S-shape region of pump turbines by means of transient tests is presented. The behavior of pump turbines is characterized by the S-shape region that is passed during load rejection. The mechanisms within the S-shape region are still part of basic research. Beside the known Thoma number dependency, further non-linear effects in terms of a hysteresis loop in the S-shape region are suspected. Since the S-shape region is passed in both directions during load rejection a hysteresis behavior would in uence the water way dynamics. The common approach by measuring various steady points is not able to capture this non-linear effect. Therefore, a transient approach for model tests is investigated. Within this paper the transient model test procedure is described and the results of the model test are shown. Since the transient behavior is superimposed by high frequent pressure uctuations, special focus is on the evaluation of the measurement data. Finally, the in uence of the hysteresis behavior on the simulation results of water way dynamic system is shown.
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