Development of an Advanced PIV System for Full-Field Flow Measurement

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An advanced dynamic PIV system has been successfully developed based on the combination of a high-speed CMOS camera, a high-speed pulse laser, and a timing controller. Adding another CMOS camera, a stereoscopic PIV system has been constructed with a pair of Scheinmpflug positioning devices (made in-house). The system has been applied to various flow fields for the full-field flow measurement.The water-droplet jet flow has been measured using the present dynamic PIV system. The flow downstream an axial flow fan for PC cooling system, rotating at 1,800 rpm, has been measured using the stereoscopic and dynamic PIV system.A new system with high dynamic ranges not only in time but also in space has been developed successfully by using two high speed cameras, and it was applied to a free jet flow..Turbulent and vortex structure of air jets issuing from a multi-hole nozzle have been analyzed using experimental results obtained by stereoscopic dynamic-PIV. And the technique of simultaneous mea … More surements of size and 3D velocity components of spray droplets has been established.Non-invasive stereo calibration technique for complicated living body models had been developed and highly temporal and spatial resolution of unsteady flow measurement is enabled. The dynamic PIV system is applied to analyze pulsatile flow inside the arterial model, which has highly instability and 3-dimensional complexity.A scanning stereoscopic PIV has been developed in success and was applied to measure the three-dimensional velocity and vorticity distribution of the round jet and the round impinging jet, where an impinging flat plate was installed in the flow apparatus of the round jet. Stretching of vortices in the stagnation region was observed.The dynamic PIV system developed has been used for the spatio-temporal measurement of a circular impinging jet flow of water. The measurement has been verified through an evaluation of turbulence quantities obtained. Spatio-temperal behaviors of turbulent structures in the stagnation region are analyzed, showing intermittent appearance of high-speed fluid lumps near the wall and the associated presence of transverse vortical structures.The International Workshop on Dynamic PIV was hosted by the present project group. Less