In fluid machines such as turbo-pumps and hydro-turbines, self-exited vibrations are among the most serious problems that can cause accidents. However, there have been few reports on the self-excited vibrations, which are treated as a coupled problem between the stiffness of the plate and flow disturbance. Basic studies have been performed to clarify the mechanism of the cover-plate vibration induced in the turbo machinery. In the present study, we employ a water tunnel using a test section comprising a flat plate with a hole and pressure chamber that simulates the passage of impeller of the hydraulic machines, and we discuss the characteristics of the self-excited vibration of a flat plate using a hole for water flow. The results show that the vibration occurs when the natural frequency of the plate corresponds approximately with the specific frequency when the Strouhal number St ≈ 0.5, and the frequency of flat-plate vibration depends on the flow velocity. In addition, we show that the amplitude of the vibration is related to the thickness of the plate, geometry of the hole (circle, square), and flow angle for the square hole.
- Fluids Engineering Division
Self-Excited Vibration of a Flat Plate With a Hole for Water Flow
- Views Icon Views
- Share Icon Share
- Search Site
Takahashi, K, Hiroki, F, Sato, K, & Nishibe, K. "Self-Excited Vibration of a Flat Plate With a Hole for Water Flow." Proceedings of the ASME 2016 Fluids Engineering Division Summer Meeting collocated with the ASME 2016 Heat Transfer Summer Conference and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. Volume 1B, Symposia: Fluid Mechanics (Fundamental Issues and Perspectives; Industrial and Environmental Applications); Multiphase Flow and Systems (Multiscale Methods; Noninvasive Measurements; Numerical Methods; Heat Transfer; Performance); Transport Phenomena (Clean Energy; Mixing; Manufacturing and Materials Processing); Turbulent Flows — Issues and Perspectives; Algorithms and Applications for High Performance CFD Computation; Fluid Power; Fluid Dynamics of Wind Energy; Marine Hydrodynamics. Washington, DC, USA. July 10–14, 2016. V01BT14A007. ASME. https://doi.org/10.1115/FEDSM2016-7645
Download citation file: