POD modal analysis of turbulent diffusion based on experimental data

被引：0
|
作者：
Wang F. [1 ]
Jia S. [1 ]
Zhang H. [1 ]
Yuan X. [1 ]
Yu K. [1 ]
机构：
[1] State Key Laboratory of Chemical Engineering, School of Enginering and Technology, Tianjin University, Tianjin
来源：
Huagong Xuebao/CIESC Journal | 2021年 / 72卷 / 09期
关键词：
LIF; PIV; POD analysis; Turbulent diffusion;
D O I：
10.11949/0438-1157.20210304
中图分类号：
学科分类号：
摘要：
In this paper, velocity and concentration distributions of fluorescent agent in turbulent liquid flow in a horizontal channel were experimentally measured by simultaneous use of particle image velocimetry (PIV) and laser induced fluorescence (LIF) technologies. Then an approach to numerical reconstruction of the concentration distribution by using the proper orthogonal decomposition (POD) analysis based on the experimental data was developed. For doing this, the POD method was applied to analyze instantaneous concentration distribution characteristics, and obtain different modes of the concentration distribution, and the spatial characteristics of the modes and their energy were analyzed. The results show that the concentration distribution in the area close to the phosphor inlet has a strong periodicity, and the low-order POD mode energy is dominant. The modalities obtained by applying POD analysis can more accurately reconstruct the basic characteristics of the concentration distribution in the area closer to the phosphor inlet, and the relative error is mainly concentrated in the area which is far from the injection mouth. This suggests that the POD analysis approach proposed in the present paper is suitable for numerical reconstruction of concentration distribution in the turbulent flow systems with periodicity, and thus lays a foundation for effective prediction of concentration distribution in turbulent diffusion processes. © 2021, Editorial Board of CIESC Journal. All right reserved.
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页码：4531 / 4543
页数：12
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