THREE-DIMENSIONAL PTV MEASUREMENT OF MIXING FLOW BY BUBBLING JET IN A CYLINDRICAL VESSEL

圆柱容器内鼓泡喷射混合流的三维 PTV 测量

• 批准号: 02650484
• 负责人: UEMURA Tomomasa
• 金额: $ 1.41万
• 依托单位: OSAKA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650484/
• 关键词: Image processing; Three-dimensional PTV; Three-dimensional PIV; Binary Image Correlation Method; Velocity Measurement; Mixing flow; Water model; Injection Metallurgy; 三次元PTV; 三次元速度分布; 流れの可視化; 底吹き気泡攪拌; 攪拌流れ; 画像解析; 2値化相関法; 気泡撹拌; ガス吹き込み; 気泡噴

This project aims to measure three-dimensional motion and paths of fluid elements in a cylindrical water bath into which a bubbling jet is blown from the center of the bottom. Main effort is paid to develop a new efficient three-dimensional PTV method which can work on a personal computer system with a practical performance. In order to measure three-dimensional velocity vectors efficiently using a personal computer system, following three algorithms are newly developed:1) Measuring method of three-dimensional co-ordinates of tracer particles.2) A method for compensating the influence of refraction at the air-water boundary.3) Algorithm of three-dimensional binary-image correlation method.A two-camera-stereo system is planned for measuring three-dimensional co-ordinates of tracer particles at first, but it is found that the system is not reliable enough to determine stereo-pairs from a pair of pictures which contain more than 50 tracers. Then three-camera system is developed to satisfy the requested performance. Results of some preliminary experiments show satisfactorily performances of the measuring system.

该项目旨在测量圆柱形水浴中流体元件的三维运动和路径，气泡射流从底部中心吹入该水浴中。主要致力于开发一种新的、高效的、可在个人计算机系统上运行、具有实用性能的三维PTV方法。为了利用个人计算机系统有效地测量三维速度矢量，新开发了以下三种算法：1）示踪粒子三维坐标的测量方法。2）补偿折射处的影响的方法。 3）三维二值图像相关法算法。最初计划采用双目立体系统来测量示踪粒子的三维坐标，但发现该系统并不适用。足够可靠地确定来自包含 50 多个示踪剂的一对图片的立体对。然后开发了三摄像头系统以满足性能要求。一些初步实验的结果表明测量系统的性能令人满意。