Measurement of the fluctuating temperature field in a heated swirling jet with BOS tomography
Measurement of the fluctuating temperature field in a heated swirling jet with BOS tomography
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DOI：
10.1007/s00348-017-2367-1
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发表时间：
2017-06
影响因子：
2.4
通讯作者：
H. Lang;K. Oberleithner;C. Paschereit;M. Sieber
中科院分区：
文献类型：
--
作者：
H. Lang;K. Oberleithner;C. Paschereit;M. Sieber
本文研究了背景定向纹影层析成像技术（3D-BOS）在非等温旋转射流旋涡破碎温度场重建中的应用。评价包括用热电偶和快速响应电阻温度计对平均温度场和相平均温度场的定量比较，以及用粒子图像测速仪（PIV）对温度场和流场的定性比较。与其他温度测量技术相比，3D-BOS能够无创地捕获整个三维温度场。与以前的3D-BOS应用程序相比，本调查利用的特殊字符的流量，它提供了一个全球性的不稳定性，导致旋转对称的射流。此外，射流的旋转运动用于从单个相机获得断层摄影重建。分析和讨论了3D-BOS结果在物理设置和数值计算过程方面的质量。此外，还提出了一种新的处理视场中薄遮挡物体的方法。
This work investigates the potential of background-oriented schlieren tomography (3D-BOS) for the temperature field reconstruction in a non-isothermal swirling jet undergoing vortex breakdown. The evaluation includes a quantitative comparison of the mean and phase-averaged temperature field with thermocouple and fast-response resistance thermometer as well as a qualitative comparison between the temperature field and the flow field obtained from particle image velocimetry (PIV). Compared to other temperature-measuring techniques, 3D-BOS enables non-invasive capturing of the entire three-dimensional temperature field. In contrast to previous 3D-BOS applications, the present investigation makes use of the special character of the flow, which provides a global instability that leads to a rotational symmetry of the jet. Additionally, the rotational motion of the jet is used to obtain a tomographic reconstruction from a single camera. The quality of 3D-BOS results with respect to the physical setup as well as the numerical procedure is analyzed and discussed. Furthermore, a new approach for the treatment of thin occluding objects in the field of view is presented.