Research Center for Engineering of
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Title: Jet control of the draft tube vortex rope in Francis turbines at partial discharge
Published In: Proceedings of the 23rd IAHR Symposium on Hydraulic Machinery and Systems, Yokohama, Japan, paper 192 (on CD-ROM)r
Description: We introduce in this paper a novel, simple and robust, method to mitigate the vortex rope by using a water jet issued from the crown tip. The jet is supplied with highpressure water from spiral case inlet, through the tubular shaft. The elimination of severe pressure fluctuations at partial discharge, combined with a significant increase in the draft tube efficiency, compensates the several percents of the overall turbine discharge that bypass the runner. The vortex rope jet control method is investigated using full 3D unsteady numerical simulation, and the benefits of this novel technique are quantified.
ISBN:ISBN: 4-8190-1809-4
Publication year: 2006
Keywords:Helical vortex, jet control, turbine draft tube instability.
Download Paper: Paper
Authors: SUSAN-RESIGA Romeo , VU Thi C. , MUNTEAN Sebastian , CIOCAN Gabriel Dan , NENNEMANN Bernd ,
Type: International Conference Proceedings
Laboratory: Numerical Simulation and Parallel Computing Laboratory
Institution: UPT