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Investigation on the transient density flow field using Dynamic PIV and Digital Speckle Tomography

使用动态 PIV 和数字散斑断层扫描研究瞬态密度流场

基本信息

批准号：
15206108
负责人：
MADARAME Haruki
金额：
$ 31.45万
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：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15206108/
关键词：
Dynamic PIV Digital Speckle Tomography Transient density fluctuation flow Thermal Striping Simultaneous measurement Dynamic PIV

项目摘要

The objectives of this study are the development of the new measurement techniques for the interaction between the temperature and velocity field, the development of the advanced analysis procedure for the huge amount of three-dimensional velocity information (2D in space and 1D in time) and the investigation of the thermal striping phenomenon.In this study, the world top class Dynamic PIV system has been developed. The image resolution is one million pixel under three thousand frames per second for more than three seconds. The specification of the present PIV system is the world record. Since the amount of the data is too huge to analyze, the multi-point cross-correlation technique has been developed in this study. This technique reveals the fluctuation transfer velocity distributions. This technique is very important to analyze the thermal-striping phenomenon.Also, the combined system of the digital speckle system and the PIV has been proposed in this study. The three-dimensional den … More sity fields and two-dimensional velocity fields of the high-speed and initial CO2 flow have been reconstructed simultaneously at every 2/15000 seconds using three high-speed cameras. The vortex ring of the initial CO2 flow bas been observed by the combined system. The structure can be analyzed by the combined system for the fast, unsteady, and asymmetric flows. The transient three-dimensional density distributions and the transient velocity fields are clearly measured with 15kHz. This high-sampling rate is also the world record. Using the developed technique, the thermal striping will be analyzed with high accuracy.As a conclusion, the Dynamic PIV system and the Digital Speckle Tomography system had been combined and improved. Advanced measurement technology and the advanced information analysis system had been proposed and realized.The huge amount of the information on the flow field has been investigated using the multi-point correlation analysis. The multi-point cross-correlation is the unique technique to analyze the temporal and spatial velocity information.The interaction between the flow and thermal (density) fields has been measured by the new developed technique, dynamic speckle tomography. The interaction between the density field and flow has been clearly evaluated. Less

本研究的目标是开发新的温度和速度场相互作用的测量技术，开发海量三维速度信息(空间二维和时间一维)的高级分析程序，以及对热剥离现象的研究。图像分辨率为100万像素，每秒3000帧以下，持续3秒以上。目前的PIV系统的规格是世界纪录。由于数据量太大，无法进行分析，本研究发展了多点互相关技术。这项技术揭示了脉动转移速度分布。这项技术对于分析热条纹现象具有重要意义。此外，本研究还提出了数字散斑系统与PIV的结合系统。三维书房…用3台高速摄像机以每2/15000秒的速度同时重建了高速和初始CO_2流的更多的强度场和二维速度场。用该组合系统观测到了初始CO2流的涡环。对于快速、非定常和不对称的流动，可以用组合系统进行结构分析。在15 kHz频率下，可以清楚地测量到瞬变三维密度分布和瞬变速度场。这一高采样率也是世界纪录。因此，本文将动态PIV系统与数字散斑层析系统相结合，并对其进行改进。提出并实现了先进的测量技术和先进的信息分析系统，对海量的流场信息进行了多点相关分析。多点互相关是分析时间和空间速度信息的独特技术，利用新发展的动态散斑层析成像技术测量了流场和温度(密度)场之间的相互作用。对密度场和流动之间的相互作用进行了明确的评价。较少