Measurements within cloud cavitation by means of X-ray attenuation device

The purpose of this work is to describe the two-phase flow structure of cloud cavitation. The experimental study is performed in a cavitation tunnel equipped with a Venturi-type test section. The flow is investigated by means of an optical probe and a X-ray attenuation device. 24 collimated detectors enable measurement of the instantaneous space fraction of the vapour phase at different locations of the two-phase flow. X-ray intensity measurement mode enables fast data acquisitions (250 Hz). The studied geometry is characterized by a convergent angle of 18 deg. and a divergent angle of 8 deg. It leads to regular large vapour cloud shedding