International Journal of Fluid Machinery and Systems
Online ISSN : 1882-9554
Original paper
Hydrodynamic Damping of a Fluttering Hydrofoil in High-speed Flows
Carl W. BerganBjørn W. SolemsliePetter ØstbyOle G. Dahlhaug
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Keywords: FSI, Damping, Francis, FRF
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Volume 11 (2018) Issue 2 Pages 146-153

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Abstract

A hydrofoil resembling a high head Francis runner blade was submerged in a rectangular channel and attached to the walls in a fixed-beam configuration. The hydrofoil was excited by piezoelectric Macrofiber composite actuators (MFCs), and the vibration was measured at the trailing edge with Laser Doppler Vibrometry (LDV) and semiconductor strain gauges. The hydrofoil was exposed to water velocities ranging from 0 to 25 m/s. Lock-in occurred at approx. 11 m/s. The damping increased linearly with the water velocity, with a slope of 0.02 %/(m/s) below lock-in, and 0.13 %/(m/s) above lock-in. The natural frequency of the foil increased slightly with increasing water velocity below lock-in, due to the added stiffness of the passing water. Additionally, the natural frequency increased significantly when passing through lock-in, due to the vortex shedding phase shift.

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© 2018 Turbomachinery Society of Japan, Korean Fluid Machinery Association, Chinese Society of Engineering Thermophysics, IAHR
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