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PIV Measurement of Flow around an Arbitrarily Moving Body

机译：PIV测量任意运动物体周围的流量

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摘要

Simultaneous measurement of flow velocities around an arbitrarily moving body has been achieved by applying image processing methods to PIV experiments. This technique encompasses both two-dimensional (2D) and three-dimensional (3D) PIV measurements. A contour-texture analysis based on user-defined textons was applied to determine the arbitrarily moving interface in the 2D PIV, and a tracking approach with prediction and correction by textons was introduced for a time-saving calculation. For a tomographic 3D PIV, red fluorescent particles were used as tracer particles. Particle images could be extracted by using an image separation. To improve the reconstruction accuracy, the volume self-calibration technique was employed. Three-dimensional surface shapes were reconstructed by tracking the surface deformation. The surface reconstruction procedure with the tomographic PIV system was validated for various known shaped cylinder rotations.
机译：通过将图像处理方法应用于PIV实验，可以同时测量任意运动物体周围的流速。这项技术涵盖了二维（2D）和三维（3D）PIV测量。应用基于用户定义的纹理的轮廓纹理分析来确定2D PIV中的任意移动界面，并引入了通过纹理进行预测和校正的跟踪方法以节省时间。对于层析3D PIV，红色荧光颗粒用作示踪颗粒。可以通过使用图像分离来提取粒子图像。为了提高重建精度，采用了体积自校准技术。通过跟踪表面变形来重建三维表面形状。层析X射线断层摄影系统的表面重建程序已针对各种已知形状的圆柱体旋转进行了验证。

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