Experimental investigation of material effects on free vibration of a splitter plate

Experimental investigation of material effects on free vibration of a splitter plate Fluid-structure interaction resulting from free vibration is a complex phenomenon, not fully understood today. In the present study the flow separation from the trailing edge of a splitter plate in a convergent channel involves Vortex-Induced Vibration (VIV) modifying the fundamental instability related to vortex shedding. Under certain conditions, the VIV produces cellular vortex shedding at the trailing edge. In this paper, we attempt experimentally to further investigate the important parameters affecting VIV phenomenon. We present results on measurements on the effect of plate material. Experimental techniques include Laser Telemetry (LT), which is a laser displacement sensor used to measure the vibrational response of the plate and Particle Image Velocimetry (PIV), which is used to measure the corresponding effect on the vortex shedding. Combining data from these techniques the variation in the response of the plate due to material effects can be addressed together with the imprint of the excited vibration mode on the flow. Measurements were performed with five different plate materials over a range of Reynolds numbers. The results show that the vibrational response of the combined fluid-structure system is modified by the VIV instability. A characteristic vibrational behaviour with a stepwise increase of the frequency of the dominant vibration mode is formed as the vortex shedding frequency (f s) synchronizes to the plate vibration frequency (f o). The synchronization takes place over a range of Re numbers. After certain Re number threshold is exceeded the frequency jumps to a new synchronization region. The dimensionless vibration frequency (St o) of the plate, being a Strouhal number characterized by f o forms a saw tooth profile centered to reduced velocity value inside the range of highest amplitude response. This behavior is explained by the natural frequencies of the combined fluid-structure system. The results further show that the vibration frequency and amplitude are modified due to material properties. As the mass ratio (M*) is increased the vibration frequency increases and the dimensionless amplitude (A/d) decreases. The number of synchronization regions decreases and the ranges extend wider in terms of Re number with increasing M*. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Experimental investigation of material effects on free vibration of a splitter plate

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Copyright © 2007 by Springer-Verlag
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
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