期刊
MEASUREMENT SCIENCE AND TECHNOLOGY
卷 15, 期 6, 页码 1067-1078出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-0233/15/6/005
关键词
stereo PIV; three-dimensional measurement; scanning light sheet; vortical structure; turbulence
A scanning stereo particle image velocimetry (SSPIV) system was developed to measure the three-dimensional (3D) distribution of three-component (3C) velocity in a turbulent round jet. A laser light sheet produced with a high-repetition-rate pulsed Nd:YLF laser was scanned by an optical scanner in a direction normal to the sheet. Two high-speed mega-pixel resolution C-MOS cameras captured the particle images illuminated by the light sheet, and the stereoscopic PIV method was adopted to acquire the 3D-3C velocity distribution of turbulent water flow. A water jet formed by a round nozzle with an exit diameter of D = 5 mm was diagnosed by the current technique. The jet Reynolds number was set at Re approximate to 1000, and the streamwise location of the measurement was fixed at approximately x = 45 D. A measurement volume (similar to100 x 100 x 100 mm(3)) containing 50 velocity planes was scanned in 0.22 s, which was sufficiently short to capture the instantaneous vortical structures. The residue of the continuity equation (divergence) was approximately 7% of rms vorticity on the centreline of the jet. The iso-vorticity surfaces clearly depict vortical structures in the jet shear layer.
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