Advanced Instrumentation For Measuring Fluid-Structure Coupling Phenomena In The Guide Vanes Cascade Of A Pump-Turbine Scale Model

In the present study, the fluid-structure coupling is investigated in the guide vanes cascade of a pump-turbine scale model placed in the EPFL PF3 test rig. The paper focuses on the advanced instrumentation used to get reliable and complete fluid-structure coupling results. Semi-conductor strain gages are installed on three guide vanes which are especially weakened to account for stronger fluid-structure coupling phenomena. These are statically calibrated in terms of torsion torque and bending force. A laser vibrometer is used to measure the vibrating guide vane velocity Piezo-resistive pressure sensors are placed around the weakened guide vanes to monitor the influence of the structural vibrations on the surrounding flow. An underwater non-intrusive system is used to get an impulse excitation. The instrument set enables a reliable fluid-structure coupling investigation in hydraulic pump-turbine scale model. Finally, the results show a strong coupling between the vibrating guide vanes and the surrounding unsteady flow.

Published in:
Proceedings Of The Asme Fluids Engineering Division Summer Meeting - 2010 - Vol 3, Pts A And B, 585-597
Presented at:
7th International Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, and Flow-Induced Vibration and Noise, Montreal, CANADA, Aug 01-05, 2010
American Soc Mechanical Engineers, Three Park Avenue, New York, Ny 10016-5990 Usa

 Record created 2012-06-25, last modified 2018-09-13

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