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Research Development of multi-dimensional combined measurement in heat and fluid flow by multi-layer imaging.

多层成像热流与流体流多维联合测量研究进展

基本信息

批准号：
10555062
负责人：
HISHIDA Koichi
金额：
$ 5.06万
依托单位：
Keio University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10555062/
关键词：
Laser technique Non-intrusive measurement Velocity measurement Image processing PIV

项目摘要

Laser based flow measurements such as Laser Doppler Velocimetry and Particle Image Velocimetry have been applied for practical configuration and played an important role of technology development. Recently, two-dimensional PIV has already seen in much practical cases. There is, however, some difficulty in extending this to three-dimensional flows. The present study describes to approach to measure three-dimensional flow files, namely one is multiplayer approach and the other is a stereoscopic approach. Both of the systems have been developed and their feasibility has been discussed. The multi-layer PIV system which proposed in this study provides two-component velocity fields in multiple planer domain by controlling sequence of light emission and image acquisition timing, thus information of velocity fields into the depth direction can be obtained independently. The stereoscopic PIV system provides three-component velocity field in single planer domain by stereoscopic image recording a … More nd recombination procedure of the three-component vector, and reliable velocity field can be obtained from three-dimensional flow. As both of the methods which described in this study are based on conventional PIV method, difficulties to extend into three-dimensional measurement devices have been resolved and it has become possible that applying the developed systems to practical flow fields. And discussion of feasibility of the conventional PIV system has enabled clarifying to discuss about the three-dimensional measurement devices. In the multi-layer PIV system, as high power pulsed laser diodes have been used as illumination, flexibility to control light emission timing has made decomposition of three-dimensional information possible. Moreover, both of compactness and remarkable cost reduction have been achieved. In the stereoscopic PIV system, original implementation of the system provides possibility of discussion about additional uncertainties by three-component recombination procedure. As a vortex behind a cylinder has been measured by multi-layer PIV, three-dimensional flow structure in two planer domain has been measured in small time lag regarded as simultaneous fluid dynamically. In addition, two-dimensional oblique jet has been measured by stereoscopic PIV and reliability of measured in-plane velocity and a limit of accuracy to measure fluctuation of the final-component velocity are clarified. Less

激光多普勒测速和粒子图像测速等基于激光的流量测量已应用于实际配置，并在技术发展中发挥了重要作用。近年来，二维PIV已经出现在很多实际案例中。然而，将其扩展到三维流存在一些困难。本研究描述了测量三维流文件的方法，即一种是多人方法，另一种是立体方法。这两个系统都已开发出来，并讨论了它们的可行性。本研究提出的多层PIV系统通过控制发光顺序和图像采集时序，在多平面域中提供二分量速度场，从而可以独立获得深度方向的速度场信息。立体PIV系统通过立体图像记录和三分量矢量的重组过程提供单平面域的三分量速度场，并且可以从三维流中获得可靠的速度场。由于本研究中描述的两种方法都是基于传统的 PIV 方法，因此解决了扩展到三维测量设备的困难，并且将开发的系统应用于实际流场成为可能。对传统PIV系统可行性的讨论使得对三维测量设备的讨论变得更加清晰。在多层PIV系统中，由于采用高功率脉冲激光二极管作为照明，灵活地控制发光时序使得三维信息的分解成为可能。此外，还实现了紧凑性和显着的成本降低。在立体PIV系统中，系统的原始实现提供了通过三分量重组过程讨论额外不确定性的可能性。由于多层PIV测量了圆柱体后面的涡流，因此可以在小时滞下测量两个平面域中的三维流动结构，视为同时流体动态。此外，还通过立体PIV测量了二维倾斜射流，并阐明了测量面内速度的可靠性以及测量最终分量速度波动的精度限制。较少的