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

基于激光的流动测量技术，如激光多普勒测速技术和粒子图像测速技术，已经应用于实际的结构，并发挥了重要的技术发展的作用。近年来，二维PIV技术已经在许多实际应用中得到了应用。然而，把这推广到三维流动中有一些困难。本研究描述了测量三维流动文件的两种方法，即多层方法和立体方法。这两个系统已经开发，并讨论了其可行性。本文提出的多层PIV系统通过控制光的发射顺序和图像采集时间，在多个平面区域提供两分量速度场，从而可以独立地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， ...更多信息 和三分量矢量的重组过程，可以从三维流动中得到可靠的速度场。由于这两种方法都是在传统PIV方法的基础上发展起来的，因此解决了PIV技术难以推广到三维测量装置的问题，使其应用于实际流场成为可能。并对常规PIV系统的可行性进行了讨论，从而澄清了对三维测量装置的讨论。在多层PIV系统中，由于高功率脉冲激光二极管已被用作照明，控制光发射定时的灵活性使得三维信息的分解成为可能。此外，紧凑和显着的成本降低已经实现。在体视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附加不确定性的可能性。在用多层PIV测量圆柱后涡的基础上，在小时滞条件下，用流体动力学方法同时测量了两个平面区域内的三维流动结构。此外，二维倾斜射流已被测量的立体PIV和测量的面内速度的可靠性和测量的精度的限制，以测量的最终组件的速度波动澄清。少

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