Research on Complex Turbulent Structure by Smart Visualized Information Processing Technique

智能可视化信息处理技术研究复杂湍流结构

基本信息

项目摘要

This study developed an application of the smart visualized image processing and wavelet technique to turbulent flow images and PIV (Particle Image Velocimetry) technique in order to improve the temporal resolution of images and to analyze multi-scale turbulent structures. It is well-known fact that flow images consist of a set of sequentially discretized images in time domain. The smart visualized image processing can convert the discretized images into continuous images based on Helmholtz equation and is effective when it is used in image processing. In this study the turbulent jet images and standard PIV images were used to evaluate the smart visualized information processing. Images of a turbulent wake with higher temporal resolution were generated, which were used to analyze the mechanism of jet flow The PIV results obtained from the generated PIV images agreed with the accurate solution. It can say that the smart visualized image processing technique is effective in both flow ima … More ge analysis and PIV system. On the other hand, the vector wavelet multi-resolution technique was apply to analyzing the three-dimensional measurement results of a high-resolution dual-plane stereoscopic PIV system for revealing a fundamental understanding of the multi-scale vortical structures in the near field of turbulent lobed jet The instantaneous three-dimensional velocity vectors were decomposed into large-and small-scale velocity fields. The instantaneous pairs of large-scale streamwise vortices can be clearly observed around the edge position of the lobed nozzle and spread outward along the lobes. The stronger small-scale streamwise vortices were found in the lobe regions, which first spread outward along the lobes and then develop to the whole measured flow field. These small-scale streamwise vortices also play an important role in enhancing mixing process. It is also found that the strength of the large-scale azimuthal Kelvin-Helmholtz vortices is higher than that of the streamwise vortices. At the downstream the stronger large-scale azimuthal vortices are concentrated in the region of jet core. Less
为了提高湍流图像的时间分辨率和分析湍流结构,本文将智能可视化图像处理和小波技术应用于湍流图像和PIV(Particle Image Velocimetry)技术。众所周知,流动图像由一组在时域上顺序离散的图像组成。智能可视化图像处理方法可以将离散图像转换为基于亥姆霍兹方程的连续图像,在图像处理中有很好的效果。本研究利用湍流射流图像和标准PIV图像对智能可视化信息处理进行了评价。利用高时间分辨率的PIV图像,对射流的形成机理进行了分析,得到了与精确解相一致的PIV结果。可以说,智能可视化图像处理技术对这两种流动图像都是有效的。 ...更多信息 ge分析和PIV系统。另一方面,将矢量小波多分辨率技术应用于高分辨率双平面立体PIV系统的三维测量结果分析,揭示了湍流波瓣射流近场多尺度涡结构的基本认识。在波瓣喷管的边缘位置附近可以清楚地观察到瞬时的大尺度流向涡对,并沿波瓣沿着向外扩展。在叶瓣区域发现了较强的小尺度流向涡,它首先沿叶瓣沿着向外扩展,然后发展到整个测量流场。这些小尺度流向涡在增强混合过程中也起着重要的作用。结果还发现,大尺度方位角Kelvin-Helmholtz涡的强度比流向涡的强度高。在下游,较强的大尺度方位涡集中在射流核心区域。少

项目成果

期刊论文数量(56)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Hui LI: "Wavelet Multi-Resolution Analysis of Initial Condition Effects on Near-Wake Turbulent Structures"Journal of Visualization. Vol.5, No.4. 343-354 (2002)
李辉:“初始条件对近尾流湍流结构影响的小波多分辨率分析”可视化杂志。
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Hui LI: "Visualization of Multi-scale Turbulent Structure in Lobed Mixing Jet Using Wavelets"Journal of Visualization. Vol.4, No.3. 231-238 (2001)
李辉:“利用小波实现波瓣混合射流多尺度湍流结构的可视化”可视化杂志。
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Hui LI, Y.Zhou, M.Nakano: "Effects of Reynolds Number on the Turbulent Structures of Different Scales"Proceedings of the 7^<th> Triennial International Symposium on Fluid Control, Measurement and Visualization, Italy. ID-245. 1-11 (2003)
李辉,周宇,M.Nakano:“雷诺数对不同尺度湍流结构的影响”第七届流体控制、测量与可视化国际研讨会论文集,意大利。
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Y.Zhou, Hui LI: "Comparison Between Screen and Triangular Cylinder Far-Wakes"Experimental Thermal and Fluid Science. Vol.27. 629-637 (2003)
周勇,李辉:“屏幕与三角柱远尾波的比较”实验热与流体科学。
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M.Forsth, Hui LI: "Characteristic Scales in a Spray From a Diesel Injector Studied with Wavelet Multi-resolution Analysis"International Journal of Wavelets, Multiresolution and Information Processing. Vol.2, No.4. (2004)
M.Forsth,李辉:“用小波多分辨率分析研究的柴油喷射器喷雾中的特征尺度”国际小波、多分辨率和信息处理杂志。
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RINOSHIKA Akira其他文献

RINOSHIKA Akira的其他文献

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{{ truncateString('RINOSHIKA Akira', 18)}}的其他基金

Research on Relaxation Environment and Natural Drying of Food by Using Control of Vortical Fluctuation
利用涡动控制的松弛环境与食品自然干燥研究
  • 批准号:
    23560186
  • 财政年份:
    2011
  • 资助金额:
    $ 1.92万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

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Source separation using N-tree discrete wavelet transform and sparse representation
使用 N 树离散小波变换和稀疏表示进行源分离
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    2014
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Creation of innovative signal and image processing method by realization of variable filter band discrete wavelet transform
通过实现可变滤波器带离散小波变换创建创新的信号和图像处理方法
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Abnormal Signal Detection in High-speed and Real-time by usingInnovative Parasitic Discrete Wavelet Transform
利用创新的寄生离散小波变换高速实时检测异常信号
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    22560418
  • 财政年份:
    2010
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    $ 1.92万
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Development of Innovative Method for Defect Detection on Metallic Surface using Complex Discrete Wavelet Transform
开发利用复离散小波变换进行金属表面缺陷检测的创新方法
  • 批准号:
    19560423
  • 财政年份:
    2007
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SBIR Phase II: Parallel Hardware Implementation of the Split and Merge Discrete Wavelet Transform for Wireless Communication
SBIR 第二阶段:无线通信中分离与合并离散小波变换的并行硬件实现
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    0239330
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    Standard Grant
SBIR Phase I: Parallel Hardware Implementation of the Split and Merge Discrete Wavelet Transform for Wireless Communication
SBIR 第一阶段:无线通信中分离和合并离散小波变换的并行硬件实现
  • 批准号:
    0109649
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VLSI Architecture for Video Codec Based on Discrete Wavelet Transform
基于离散小波变换的视频编解码VLSI架构
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    12450153
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International Research Fellow Awards: Discrete Wavelet Transform Analysis of Large Scale Structure
国际研究员奖:大型结构的离散小波变换分析
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    9813041
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    1998
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    $ 1.92万
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    Fellowship Award
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