Simultaneous measurement of temperature and velocity using two-colour LIF combined with PIV with a colour CCD camera and its application to the turbulent buoyant plume
Simultaneous measurement of temperature and velocity using two-colour LIF combined with PIV with a colour CCD camera and its application to the turbulent buoyant plume
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DOI：
10.1088/0957-0233/15/5/030
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发表时间：
2004-05-01
影响因子：
2.4
通讯作者：
Ikeda, H
中科院分区：
文献类型：
--
作者：
Funatani, S;Fujisawa, N;Ikeda, H
本文介绍了一种用彩色CCD摄像机同时测量流体平面截面内温度和速度的方法。该技术结合了激光诱导荧光（LIF）和粒子图像测速（PIV）技术。温度是通过使用彩色CCD相机的红色和绿色图像的双色LIF技术来评估的，而速度是通过PIV从两个连续的蓝色图像获得的。它被发现，本技术的温度灵敏度几乎是相同的标准的双色LIF技术，由两个单色CCD相机与最佳的过滤器设置，但它提供了一个简单方便的系统，同时测量温度和速度的热流。在温度测量的不确定性被发现是一个函数的浓度比的荧光染料在双色LIF技术，它的速度测量的示踪粒子的数量的增加而增加。该技术已成功地应用于湍流浮力羽流中温度和速度的同时测量。在浮力羽流的初始区域，如羽流的平均和湍流特性以及湍流热通量的统计特性进行了评估。
In this present paper, a method for simultaneously measuring the temperature and the velocity in a planar cross-section of fluid flow with a colour CCD camera is described. This technique combines the laser-induced fluorescence (LIF) and particle image velocimetry (PIV). The temperature is evaluated by the two-colour LIF technique using red and green images of the colour CCD camera, while the velocity is obtained from two sequential blue images by PIV. It is found that the temperature sensitivity of the present technique is almost the same as that of the standard two-colour LIF technique by two monochrome CCD cameras with optimum filter setting, but it provides a simple and convenient system for simultaneous measurement of temperature and velocity in thermal flows. The uncertainty in the temperature measurement is found to be a function of concentration ratios of the fluorescent dyes in the two-colour LIF technique and it increases with an increase in the number of tracer particles for velocity measurement. This technique is successfully applied to the simultaneous measurement of temperature and velocity in the turbulent buoyant plume. The statistical properties of the plume, such as mean and turbulence characteristics of the plume as well as turbulent heat fluxes are evaluated in the initial region of the buoyant plume.