Stereoscopic particle image velocimetry measurements of the flow around a Rushton turbine
Stereoscopic particle image velocimetry measurements of the flow around a Rushton turbine
复制标题
拉什顿涡轮机周围流动的立体粒子图像测速测量
DOI：
10.1007/s003480000116
复制
发表时间：
2000
影响因子：
2.4
通讯作者：
R. Adrian
中科院分区：
文献类型：
--
作者：
D. Hill;K. Sharp;R. Adrian
摘要：立体粒子图像测速 (PIV) 原理（包括畸变补偿）应用于由 Rushton 涡轮搅拌的容器中的湍流。为了满足 Scheimpflug 条件，使用了角度偏移配置并合并了倾斜轴镜头安装座，从而显着降低了此类配置通常需要的大景深要求。使用畸变补偿程序或原位校准来代替先前研究中使用的光线追踪或机械配准。使用两项测试来验证校准程序，一项是散斑目标的刚性平移，另一项是两个同心圆柱体之间的粘性流。测试结果表明失真补偿程序可以成功地应用于实际流体流动。对锁相瞬时数据进行系综平均和插值，以获得包围涡轮叶片的圆柱壳上的平均 3-D 速度场。从这些场中，可以轻松识别先前混合器流动研究中记录的尖端涡对和径向射流。
Abstract The principles of stereoscopic particle image velocimetry (PIV), including distortion compensation, were applied to the turbulent flow in a vessel stirred by a Rushton turbine. An angular offset configuration was used and tilt-axis lens mounts were incorporated in order to satisfy the Scheimpflug condition, significantly reducing the ordinarily large depth of field requirements of such configurations. A distortion compensation procedure, or in situ calibration, was utilized in place of the ray tracing, or mechanical registration, used in previous studies. The calibration procedure was validated using two tests, one a rigid translation of a speckle target, the other the viscous flow between two concentric cylinders. The results of the tests suggest the success with which the distortion compensation procedure may be applied to real fluid flows. Phase-locked instantaneous data were ensemble averaged and interpolated in order to obtain mean 3-D velocity fields on a cylindrical shell enclosing the turbine blade. From these fields, the tip vortex pairs and the radial jet documented in previous studies of mixer flows were easily identified.