基于三目视觉的圆柱尾迹层析PIV测量

doi:10.16085/j.issn.1000-6613.2021-1384

化工进展 ›› 2021, Vol. 40 ›› Issue (12): 6523-6531.DOI: 10.16085/j.issn.1000-6613.2021-1384

基于三目视觉的圆柱尾迹层析PIV测量

段双成¹^,²(), 杨苗¹^,², 封明军¹^,², 王芳婷¹^,², 周骛¹^,²(), 蔡小舒¹^,²

^1.上海理工大学能源与动力工程学院，上海 200093
^2.上海市动力工程多相流动与传热重点实验室，上海 200093

收稿日期:2021-07-01 修回日期:2021-08-04 出版日期:2021-12-05 发布日期:2021-12-21
通讯作者: 周骛
作者简介:段双成（1995—），男，硕士研究生，研究方向为三维流场测量。E-mail：892670800@qq.com。
基金资助:
国家科技重大专项(2017-V-0016-0069);国家自然科学基金(51576130)

Measurement of cylindrical wake flow field using Tomographic-PIV based on trinocular vision

DUAN Shuangcheng¹^,²(), YANG Miao¹^,², FENG Mingjun¹^,², WANG Fangting¹^,², ZHOU Wu¹^,²(), CAI Xiaoshu¹^,²

^1.School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
^2.Shanghai Key Laboratory of Multiphase Flow and Heat Transfer for Power Engineering, Shanghai 200093, China

Received:2021-07-01 Revised:2021-08-04 Online:2021-12-05 Published:2021-12-21
Contact: ZHOU Wu

摘要/Abstract

摘要：

多数机械设备如换热器、汽轮机、燃气轮机等内部流场均具有内部空间狭小、流场流动复杂的特点。目前对于该类流场测量多采用二维粒子图像测速（PIV）的方法，难以反映真实的流场速度分布；同时多数三维流场测量系统设备复杂且昂贵，难以应用到狭小的空间测量中。因此本文搭建了一套基于三台相机的三维流场测量系统，针对某矩形水流管道，应用层析PIV技术对圆柱尾迹的低速流场进行了测量，成功观察并重建了圆柱产生的三维卡门涡街流场。测量区域约为30mm×30mm×5mm，三维空间分辨率达到20voxels/mm，重投影误差小于0.5%。研究结果表明，采用本文搭建的三相机层析PIV系统测量得到的三维矢量场合理地反映了圆柱尾迹的流动结构；MLOS算法相较于传统MART算法能够有效降低重构所耗时间，并能够达到同样的重建精度。本文搭建的测量系统也可用于其他低速流体实验中，而三相机的布置为测量狭小空间的复杂流场提供了可能。

关键词: 三目视觉, 粒子图像测速, 层析, 圆柱尾迹, 卡门涡街

Abstract:

The internal flow fields of most mechanical equipment, such as heat exchanger, steam turbine, and gas turbine have the characteristics of narrow internal space and complex flow field. At present, the two-dimensional particle image velocimetry (PIV) method is usually used to measure this kind of flow field, which is difficult to reflect the real velocity distribution. At the same time, most of the three-dimensional flow field measurement systems are complex and expensive, and it is difficult to be applied to the measurement for narrow space. Therefore, a set of three-dimensional flow field measurement system based on three cameras was built in this paper. The low-speed flow field of cylindrical wakes in a rectangular water pipeline was measured using Tomographic PIV. The three-dimensional Karman vortex street flow field generated by the cylindrical was successfully observed and reconstructed. The measurement area was about 30mm×30mm×5mm, the three-dimensional spatial resolution reached 20voxels/mm, and the reprojection error was less than 0.5%. The results showed that the three-dimensional vector field measured by the three-camera Tomographic-PIV system could reasonably reflect the flow structure of the cylindrical wake. Compared with the traditional MART (multiplicative algebraic reconstruction technique) algorithm, MLOS (multiplicative line-of-sight) algorithm could effectively reduce the reconstruction time and achieve the same reconstruction accuracy. The measurement system could also be used in other low speed fluid experiments, and the arrangement of three cameras provided the possibility to measure the complex flow field in small space.

Key words: trinocular vision, particle image velocimetry (PIV), tomography, cylindrical wake, Karman vortex street

中图分类号:

O359

段双成, 杨苗, 封明军, 王芳婷, 周骛, 蔡小舒. 基于三目视觉的圆柱尾迹层析PIV测量[J]. 化工进展, 2021, 40(12): 6523-6531.

DUAN Shuangcheng, YANG Miao, FENG Mingjun, WANG Fangting, ZHOU Wu, CAI Xiaoshu. Measurement of cylindrical wake flow field using Tomographic-PIV based on trinocular vision[J]. Chemical Industry and Engineering Progress, 2021, 40(12): 6523-6531.

图/表 10

图1 三目PIV测量原理

图2 坐标系概况

图3 层析重构算法

图4 槽道流实验平台管道结构

图5 三目层析PIV测量装置

图6 左、中、右三台相机的标定结果

图7 三维粒子场重建切片图

图8 典型的重投影相对误差分布

图9 不同时刻某二维法向-流向面涡量图

图10 互相关计算结果

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基于三目视觉的圆柱尾迹层析PIV测量

Measurement of cylindrical wake flow field using Tomographic-PIV based on trinocular vision

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