[PDF][PDF] In situ unsteady pressure measurements on the draft tube cone of the Francis turbine with air injection over an extended operating range

S Muntean, RF Susan-Resiga, VC Campian… - UPB Sci. Bull …, 2014 - researchgate.net
S Muntean, RF Susan-Resiga, VC Campian, C Dumbrava, A Cuzmos
UPB Sci. Bull. Ser. D, 2014researchgate.net
Operating Francis turbines over extended range is often hindered by the flow instabilities
developed downstream the runner, in the draft tube cone. The unsteady pressure field
induced by flow instabilities leads to pressure fluctuations. The paper presents the
experimental investigations of the unsteady pressure field generated by flow instabilities into
a draft tube of the Francis turbine over extended operating range. In situ measurements are
performed without and with air injection in order to assess the control method. The unsteady …
Operating Francis turbines over extended range is often hindered by the flow instabilities developed downstream the runner, in the draft tube cone. The unsteady pressure field induced by flow instabilities leads to pressure fluctuations. The paper presents the experimental investigations of the unsteady pressure field generated by flow instabilities into a draft tube of the Francis turbine over extended operating range. In situ measurements are performed without and with air injection in order to assess the control method. The unsteady pressure is recorded in five locations on the draft tube cone wall. As a result, the Fourier spectra are obtained without and with air injection in order to identify the fundamental frequency and associated amplitude. In this case, the air injection improves significantly the dynamic behavior at 0.7 QBEP while for operating points at lower discharge (around 0.5 QBEP) the dynamic behavior is deteriorated.
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