基于光场成像PTV的气泡尺寸与速度同步测量方法  

Simultaneous measurement method for bubble size and velocity based on light field imaging PTV

作　　者：鲁非凡 李健[1] 赵陆海波 唐志永[2] 许传龙[1] Lu Feifan;Li Jian;Zhao Luhaibo;Tang Zhiyong;Xu Chuanlong(School of Energy and Environment,Southeast University,Nanjing 210096,China;Key Laboratory of Low-Carbon Conversion Science and Engineering,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China)

机构地区：[1]东南大学能源与环境学院,南京210096 [2]中国科学院上海高等研究院低碳转化科学与工程重点实验室,上海201210

出　　处：《东南大学学报（自然科学版）》2022年第5期963-971,共9页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51976038);江苏省重点研发计划(社会发展)资助项目(BE2020691)。

摘　　要：为研究鼓泡浆态床内气泡的三维运动特性,提出了基于光场成像粒子跟踪测速(PTV)技术的气泡尺寸与速度同步测量方法.构建了光场PTV气泡测量系统,使用光场相机采集连续2帧光场图像,经过重聚焦计算、图像处理和清晰度评价,结合标定结果计算气泡的尺寸和三维坐标,使用PTV技术计算气泡的三维速度,实现气泡尺寸和三维速度的同步测量.开展了光场PTV系统评价和气泡尺寸、三维速度测量的实验.结果表明:直径测量的相对误差小于1.60%,重复性误差小于2.48%,深度位置测量的相对误差小于7.14%;当气流量从0.1 L/min增加到0.5 L/min时,气泡的平均当量直径从3.85 mm增至4.36 mm,气泡平均速度从0.34 m/s增至0.38 m/s.光场成像PTV技术可用于气泡尺寸和三维速度的同步测量.To study the three-dimensional motion characteristics of bubbles in a bubble slurry bed, a simultaneous measurement method for bubble size and velocity based on a light field imaging particle tracking velocimetry(PTV) technology was proposed. A light-field PTV bubble measurement system was constructed, the light-field camera was used to collect two consecutive light field images. After refocusing calculation, image processing and sharpness evaluation, the size and three-dimensional coordinates of the bubbles were calculated combined with the calibration results. The PTV technology was used to calculate the three-dimensional velocity of the bubble, and the simultaneous measurement of bubble size and three-dimensional velocity was completed. The evaluation of the light field PTV system and the measurement of bubble size and three-dimensional velocity were carried out. The results show that the relative error of the diameter measurement is less than 1.60%, the repeatability error of the diameter measurement is less than 2.48%, and the relative error of the depth position measurement is less than 7.14%. When the air flow increases from 0.1 L/min to 0.5 L/min, the average equivalent diameter of the bubbles increases from 3.85 mm to 4.36 mm, and the average bubble velocity increases from 0.34 m/s to 0.38 m/s. The light field imaging PTV technology can be used for simultaneous measurement of the bubble size and the three-dimensional velocity.

关 键 词：光场成像 粒子追踪 速度 尺寸 测量 气泡 

分 类 号：TK314[动力工程及工程热物理—热能工程]