Excitation of plates and hydrofoils by trailing edge flows
Abstract
Flow-induced lifting surface vibration is discussed in terms of surface flow regime properties determined by Reynolds number and plate or hydrofoil geometry. Flow excitation may be tonal when generated by periodic vortex shedding or random when due to turbulent flow on the surface. Having established the conditions for the existence of vortex shedding excitation, relationships are given by means of which to estimate the flow-induced vibration levels to be expected from each flow source. A quantification of the governing parameters for feedback between vibration and vortex shedding is achieved through measurements of surface pressures generated by wakes that are forced with oscillating trailing edges. Criteria are given for the estimation of the upper bound of 'singing' vibration amplitudes in hydrofoils and marine propellers, as a function of structural parameters.
- Publication:
-
IN: International Symposium on Turbulence-Induced Vibrations and Noise of Structures
- Pub Date:
- 1983
- Bibcode:
- 1983asme.symp...45B
- Keywords:
-
- Hydroelasticity;
- Hydrofoils;
- Laminar Flow;
- Structural Vibration;
- Trailing Edges;
- Turbulent Flow;
- Vortex Streets;
- Acoustic Propagation;
- Aeroelasticity;
- Laminar Wakes;
- Reynolds Number;
- Separated Flow;
- Turbine Blades;
- Viscous Flow;
- Fluid Mechanics and Heat Transfer