Analysis Of Particular Experimental
Measurements In Cavitating Stream Flow
Author(s)
G. Ciaravino
Abstract
In the present paper an analysis is conducted on the application of the acoustic
method and the Laser-Doppler Anemometer (LDA) to measurements of
turbulence in cavitating stream flow in a short pipe. When developed cavitation
is detected in experiments conducted using the acoustic method, we find
structures comprising vortices (travelling cavitation) and structures comprising
large cavities (fixed cavitation) which form periodically and are transported by
the stream flow. Under different operating conditions, the LDA measured the
longitudinal component of velocity agitation and the corresponding power
spectral density. This made it possible to detect the presence of quasi-periodic
components in the turbulence structure with frequencies coinciding with those of
the vortices and the cavities, under the corresponding operating conditions. This
points to a reciprocal validation of the two measurement methodologies (acoustic
and laser) and the influence of cavitation phenomena on the turbulent structure
and on the flow characteristics.
Keywords: cavitating flow, experimental measurements of turbulence, Laser-
Doppler Anemometer, acoustic method.
1 Introduction
Experimental analysis of cavitation phenomena has received increasing
development over recent decades thanks to particular measurement techniques
and to advanced instrumentation. The measurement of these phenomena is
particularly complicated as cavitation generally takes place in an enclosed
environment and so any instrumentation that is inserted into the stream flow will
cause a considerable disturbance. Moreover, it is well known that the interest in
Keywords
cavitating flow, experimental measurements of turbulence, Laser-
Doppler Anemometer, acoustic method.
Related Book
Other papers in this volume
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