High-speed scanning stereoscopic PIV for 3D vorticity measurement in liquids
High-speed scanning stereoscopic PIV for 3D vorticity measurement in liquids
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DOI：
10.1088/0957-0233/15/6/005
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发表时间：
2004-06-01
影响因子：
2.4
通讯作者：
Sakakibara, J
中科院分区：
文献类型：
--
作者：
Hori, T;Sakakibara, J
研制了一套扫描立体粒子图像测速系统(SSPIV)，用于测量圆形湍流射流中三分量(3C)速度的三维分布。用高重复率脉冲Nd：YLF激光器产生的激光光片被光学扫描器沿垂直于激光光片的方向扫描。利用两台高速百万像素分辨率的C-MOS相机拍摄了光片照射下的粒子图像，并采用立体PIV方法获得了湍流水流的3D-3C速度分布。利用该技术对出口直径为D=5 mm的圆形喷嘴形成的水射流进行了诊断。喷流雷诺数设置为Re约为1000，测量的流向位置固定为约x=45D。在0.22 S中扫描了一个包含50个速度面的测量体积(类似于100×100×100 mm(3))，该体积足够短，足以捕捉到瞬时的涡旋结构。连续性方程(散度)的残差约为喷流中心线上均方根涡度的7%。等涡度面清晰地刻画了射流剪切层中的涡旋结构。
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.