PIV Based Pressure Field Measurement Technique for Open-channel Turbulence

被引：0
|
作者：
Wang Z. [1 ]
Chen Q. [1 ]
Duan Y. [2 ]
Zhong Q. [3 ]
机构：
[1] School of Civil Eng., Beijing Jiaotong Univ., Beijing
[2] State Key Lab. of Hydroscience and Eng., Tsinghua Univ., Beijing
[3] College of Water Resources and Civil Eng., China Agricultural Univ., Beijing
来源：
Gongcheng Kexue Yu Jishu/Advanced Engineering Sciences | 2023年 / 55卷 / 04期
关键词：
error sources; measurement accuracy; open-channel turbulence; PIV; pressure measurement;
D O I：
10.15961/j.jsuese.202200136
中图分类号：
学科分类号：
摘要：
PIV-based pressure field measurement technique enables a non-intrusive, high spatial and temporal resolution and full-field measurement of the instantaneous pressure of flows. The pressure field measurement technique was realized by reconstructing the pressure-gradient field from time-resolved velocity fields with an Eulerian approach and integrating the pressure-gradient field with an omnidirectional integration algorithm under given boundary conditions. To accurately measure the pressure field in open channel flows using PIV-based pressure field measurement technology, the accuracy, error sources, and major influencing factors on the measurement accuracy of the technique were analyzed with time-resolved direct numerical simulation data and PIV measured velocity fields of open channel flows. Based on the data, the measured pressure fields had a negligible mean bias error and a root mean square error of about 25%. By analyzing the measurement errors in the two stages of the pressure gradient field reconstruction from the velocity field and the pressure field integration from the pressure gradient field, the error was mainly introduced in the stage of reconstructing the pressure gradient field from the velocity fields and was affected by the measurement parameters of the velocity field and the method of setting boundary conditions. The influence rule of the above main influencing factors on the pressure measurement error was further analyzed. It was found that the error increased monotonously with the increase of the sampling interval of velocity fields. However, it decreased first and then increased with the increase of the measurement point spacing of velocity fields, with an optimal inner-scaled point spacing of about 7. However, the universality of the optimal value of measuring point spacing needed more data to support it. The measurement error was significantly reduced when the pressure boundary was given at the four corners of the rectangular measurement region. The PIV-based pressure field measurement technique was applied in a uniform open channel flow. The measured time-averaged pressure showed satisfactory accuracy, and the measured turbulent intensity of pressure had a reasonable vertical distribution but a relatively larger error. The results provided a theoretical and practical reference for measuring pressure fields in open channel flows. © 2023 Editorial Department of Journal of Sichuan University. All rights reserved.
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页码：207 / 215
页数：8
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