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Title: LDV Experimental Measurements of Swirling Flow using Flow- Feedback Jet Injection Method
Published In: Proceedings of the 4th International Meeting on Cavitation and Dynamic Problems in Hydraulic Machinery and Systems, IAHR-WG2011, University of Belgrade, Faculty of Mechanical Engineering, Belgrade, Serbia, pp. 305-313
Description: The water jet injection developed by Resiga et al. has been proved to be successful in mitigating the vortex rope and the corresponding pressure fluctuation. This method uses for supply of the jet, 10% from the flow discharge to eliminate the stagnant region, and this water is taken from upstream. Is not acceptable to bypass the runner with such a large fraction of the turbine discharge because of volumetric losses which appear into the system. The new flow-feedback control technique which has been implemented on the test rig of “Politehnica“ University of Timisoara, take a fraction of the discharge from the draft tube cone wall, and redirects upstream to form an axial jet to mitigate the pressure fluctuations associated to the vortex rope. But from experimentally point of view the flow-feedback jet control discharge cannot be evaluated. This paper presents a method of determination of the discharge value based on velocity profiles match. Flow-feedback velocity profiles measured with Laser Doppler Velocimetry are going to be compared against profiles obtained using upstream, pump-generated-jet. A match of two velocity profiles will result in the same value of flow injected in case of flow-feedback and pump-generated-jet, respectively. In that way we can find the flow-feedback
ISBN:ISBN 978-86-7083-740-9
Publication year: 2011
Keywords:Laser Doppler Velocimetry, draft tube cone, vortex rope, flow-feedback.
Download Paper: Paper
Authors: TANASA Constantin , BOSIOC Ilie Alin , SUSAN-RESIGA Romeo , MUNTEAN Sebastian ,
Type: International Conference Proceedings
Laboratory: Numerical Simulation and Parallel Computing Laboratory
Institution: UPT