Abstract
The experimental analysis of unsteady cavitating flow structures has been performed in the cavitation station in order to evaluate and correlate the static pressure measurements with the cavitation cloud structure dynamics which was quantified using the computer aided visualization technique. The paper describes the experimental method and presents the results of the investigation of the unsteady cavitation flow field, performed in the wake of bluff body. Comparison of the static pressure oscillation and cavitation cloud structures fluctuation caused by cloud shedding in the wake of bluff body, show the interaction between signals. The detailed analysis confirms two distinct types of flow pulses and quantifies the effect of cavitation number on the strength of the pressure and structure pulses.
Highlights
Cavitation is the formation and immediate implosion of cavities in a liquid that are the consequence of forces acting upon the liquid
In the present study we investigate cavitation around a bluff body with simultaneous visualization of cavitation cloud structure and pressure measurements and compare measured variables in the area of the wake
The exact relationship between the of cavitation clouds void fraction A and average region of interest (ROI) brightness μ cannot be established with single BW camera and present image acquisition configuration, we assumed that cavitation cloud void fraction A is proportional to the brightness μ in a ROI corresponding to a cavitation cloud: A(n) ∝ μ(n)
Summary
Cavitation is the formation and immediate implosion of cavities in a liquid that are the consequence of forces acting upon the liquid. Measurements performed by Kubota et al [7] showed that the cloud cavity consisted of a large-scale vortex and cluster of small vapor bubbles located in the center of the vortex Such complexity of cavitation clouds is reflected in periodic nature and variability of pressure oscillations. Connected to this paper are studies about simultaneous pressure measurements and visualization of cavitation cloud structure using high speed imaging. Visualization of cavitation cloud structure was performed with a high speed camera while pressure fluctuations were measured by an array of sensors in a thin piezoelectric membrane. In the present study we investigate cavitation around a bluff body with simultaneous visualization of cavitation cloud structure and pressure measurements and compare measured variables in the area of the wake
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