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Measurement of temperature and velocity fields in a convective fluid flow in air using schlieren images

机译：使用schlieren图像测量空气对流中的温度和速度场

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A convective fluid flow in air could be regulated if the physical process were better understood. Temperature and velocity measurements are required in order to obtain a proper characterization of a convective fluid flow. In this study, we show that a classical schlieren system can be used for simultaneous measurements of temperature and velocity in a convective fluid flow in air. The schlieren technique allows measurement of the average fluid temperature and velocity integrated in the direction of the test beam. Therefore, in our experiments we considered surfaces with isothermal conditions. Temperature measurements are made by relating the intensity level of each pixel in a schlieren image to the corresponding knife-edge position measured at the exit focal plane of the schlieren system. The same schlieren images were also used to measure the velocity of the fluid flow by using optical flow techniques. The algorithm implemented analyzes motion between consecutive schlieren frames to obtain a tracked sequence and finally velocity fields. The proposed technique was applied to measure the temperature and velocity fields in natural convection of air due to unconfined and confined heated rectangular plates.
机译：如果能更好地理解物理过程，则可以调节空气中的对流流体流量。为了获得对流流体流动的适当特征，需要温度和速度测量。在这项研究中，我们表明经典的schlieren系统可用于同时测量空气中对流流体的温度和速度。 schlieren技术可以测量沿测试光束方向积分的平均流体温度和速度。因此，在我们的实验中，我们考虑了具有等温条件的表面。温度测量是通过将纹影图像中每个像素的强度级别与在纹影系统的出口焦平面处测得的相应刀口位置相关联来进行的。相同的schlieren图像还用于通过使用光流技术来测量流体流动的速度。该算法实现了分析连续schlieren帧之间的运动以获得跟踪序列，最后获得速度场。所提出的技术被用于测量由于无限制和受限制的加热矩形板引起的空气自然对流中的温度和速度场。

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