Experimental investigation of three-dimensional effects in cavitating flows with time-resolved stereo particle image velocimetry

The present paper is devoted to characterizing the three-dimensional effects in a cavitating flow generated venturi-type profile. Experimental measurements based on 2D3C (two-dimensional-three-component) stereoscopic particle image velocimetry are conducted obtain three components of velocity field multiple vertical planes aligned with main direction, from center channel side walls. Time-resolved acquisitions conducted, so not only time-averaged quantities but also fluctuations can be discussed. attention was focused configurations cloud cavitation, where attached cavity experiences large-scale periodical oscillations and shedding clouds vapor. Although water purely two-dimensional, some significant velocities third direction (depth test section) were measured. Some those found related small differences between boundary conditions two sides, such as minor gaps sides bottom wall, while others reflect intrinsic mechanisms inside cavitation area, jets that contribute instability process. These discussed, possible 3D (three-dimensional) structure proposed.