The Development of a Multi-dimensional Image Processing System for Complex Flow Field Diagnostics

复杂流场诊断多维图像处理系统的开发

• 批准号: 10355009
• 负责人: KOBAYASHI Toshio
• 金额: $ 13.57万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10355009/
• 关键词: PIV; PTV; turbulent flow; image processing technique; velocity and scalar field simultaneous measurement; self-induced sloshing phenomena; jet mixing flows; 多次元情報画像計測; LIF; LES; 濃度相関法; 光計測; トレーサ

Extensive investigations about multi-dimensional image processing technique development for complex flow field diagnostics with high accuracy had been conducted in the pres8nt study. Advanced techniques for the simultaneous measurement of the vector (velocity) fields and scalar (spices concentration and/or temperature) fields in fluid flows had also been developed. Taking the advantage of these advanced techniques, a multi-dimensional image processing system for complex flow field diagnostics with high accuracy had been constructed- The specialized software for the multi-dimensional image processing system to do complicated multi-dimensional information extraction with high accuracy from the acquiring images had been developed. By using the artificial visualization images, various Particle Image Velocimetry (PIV) and Particle Tracking Velocimetry (PTV) image processing algorithms had been evaluated, and optimized methods for turbulence flow measurement accuracy improved had also been 1 … More 3uggested. The hardware of the multi-dimensional image processing system includes high-power double-pulsed Nd : YAG Lasers, high resolution cross-correlation CCD cameras, excellent-performanced host computer arid colossal memory for the whole-field, time-dependent and high spatial-resolved digital image acquiring and processing. Both PIV and Laser Induced Fluorescence (LIF) techniques were used to conduct simultaneous vector (velocity) and scalar (temperature and/or spices concentration) fields measurement of fluid flows.By using the multi-dimensional image processing system, a self-induced sloshing phenomena in a rectangular tank was investigated. The whole system performance and accuracy level of the multi-dimensional image processing system was evaluated through the comparison of the measurement results of the present system with the LDV (Laser Doppler Velocimenty) measurement data, which Were considered to have very high accuracy level. Based oh the measurement results of the present system to a lobed jet mixing flow and a circular jet flow, the evolution processes of various turbulent and vertical structures in the jet mixing flows were visualized quantitatively. The mechanism of the mixing enhancement of lobed nozzles over conventional circular nozzles was also analyzed. Which also demonstrated the versatile feasibility of the present system for complex flow diagnostics.In cooperation with computational Fluid Dynamics (CFD) methods, the present system may also be further developed into a hybrid system for complex flow diagnostics, which is considered to be the fashion of future fluid dynamics diagnostic system. Less

本文对复杂流场高精度诊断的多维图像处理技术的发展进行了广泛的研究。同时测量流体流动中的矢量（速度）场和标量（香料浓度和/或温度）场的先进技术也已开发出来。利用这些先进技术，构建了高精度复杂流场诊断的多维图像处理系统--开发了多维图像处理系统的专用软件，可以从采集的图像中高精度地提取复杂的多维信息。利用人工可视化图像，对各种粒子图像测速（PIV）和粒子跟踪测速（PTV）图像处理算法进行了评价，并提出了提高湍流测量精度的优化方法 ...更多信息 3uggested.多维图像处理系统的硬件包括高功率双脉冲Nd：YAG激光器、高分辨率互相关CCD摄像机、高性能的上位机和大容量存储器，可实现全场、时变和高空间分辨率的数字图像采集和处理。采用PIV和激光诱导荧光（LIF）技术对流体流动进行了矢量场（速度场）和标量场（温度场和/或浓度场）的同时测量，并利用多维图像处理系统对矩形贮箱内的自诱导晃动现象进行了研究。通过将本系统的测量结果与激光多普勒测速仪（LDV）的测量结果进行比较，评价了多维图像处理系统的整体性能和精度水平，认为该系统具有很高的精度水平。根据本系统对波瓣射流混合流和圆形射流混合流的测量结果，定量地显示了射流混合流中各种湍流结构和垂向结构的演化过程。分析了波瓣喷嘴比常规圆形喷嘴增强混合的机理。与计算流体动力学（CFD）方法相结合，本系统还可以进一步发展成为复杂流动诊断的混合系统，这被认为是未来流体动力学诊断系统的发展方向。少

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