| HYDRAULIC ENGINEERING |
|
|
|
|
|
Impact of horizontal plug-in flow meterson the velocity field-An experimental study |
| WANG Hao1, CHEN Huai2, LI Danxun1, WANG Xingkui1 |
1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China;
2. State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China |
|
|
|
|
Abstract Horizontal plug-in flow meters disturb the velocity fields when deployed to measure rates flow. The spatial extent of such disturbances has been experimentally studied here on a simplified flow meter model. The Pitot tube used as the flow model was placed horizontally in the water flow with instantaneous two-dimensional velocity fields also measured by particle image velocimetry (PIV). Analysis of the spatial variations of the velocity fields in front of the model shows that the streamwise velocity increases with the distance from the model nose and gradually approaches that of the incoming flow with the spanwise velocity, turbulent intensities, and Reynolds stresses decreasing with the distance. The streamwise velocity requires the longest distance to recover from the disturbance with the turbulent intensity requires the shortest distance. The spatial extent of the disturbance is proportional to the flow meter diameter.
|
| Keywords
particle image velocimetry (PIV)
Pitot tube
velocity
turbulence intensity
Reynolds stress
|
|
|
|
Issue Date: 15 December 2016
|
|
|
| [1] |
Baines W D. Effects of velocity distribution on wind loads and flow patterns on buildings[C]//Proceedings of the Symposium No. 16 Wind Effects on Buildings and Structures. Teddington, UK:National Measurement Institute, 1963:197-225.
|
| [2] |
Hussein H J, Martinuzzi R J. Energy balance for turbulent flow around a surface mounted cube placed in a channel[J]. Physics of Fluids, 1996, 8(3):764-780.
|
| [3] |
Fabris D, Muller S J, Liepmann D. Wake measurements for flow around a sphere in a viscoelastic fluid[J]. Physics of Fluids, 1999, 11(12):3599-3612.
|
| [4] |
CUI Lishui, HU Heming, LI Chunhui. Experimental investigation to calibrate Pitot-tube by laser doppler anemometer[J]. Acta Metrologica Sinica, 2014, 35(6):603-606.
|
| [5] |
Jiang Z Y, Liang Z L, Tang Y L, et al. Numerical simulation and experimental study of hydrodynamics of artificial reef model in current[J]. Chinese Journal of Oceanology and Limnology, 2010, 2(28):267-273.
|
| [6] |
刘焕芳, 文辉, 李强. 圆柱绕流无沙区试验研究[J]. 水科学进展, 1998, 9(2):159-163.LIU Huanfang, WEN Hui, LI Qiang. Experiment study of the region non-sediment movement in cylinder circulation flow[J]. Advances in Water Science, 1998, 9(2):159-163. (in Chinese)
|
| [7] |
Westerweel J, Elsinga G E, Adrian R J. Particle image velocimetry for complex and turbulent flows[J]. Annual Review of Fluid Mechanics, 2013, 45:409-436.
url: http://dx.doi.org/10.1146/annurev-fluid-120710-101204
|
| [8] |
陈启刚. 基于高频PIV的明渠湍流涡结构研究[D]. 北京:清华大学, 2014.CHEN Qigang. High-frequency Measurement of Vortices in Open Channel Flow with Particle Image Velocimetry[D]. Beijing:Tsinghua University, 2014. (in Chinese)
|
| [9] |
陈槐, 李丹勋, 陈启刚, 等. 明渠恒定均匀流试验中尾门的影响范围[J]. 实验流体力学, 2013, 27(4):12-16.CHEN Huai, LI Danxun, CHEN Qigang, et al. Influence of tail gate on uniform open channel flows[J]. Journal of Experiments in Fluid Mechanics, 2013, 27(4):12-16. (in Chinese)
|
| [10] |
王龙, 李丹勋, 王兴奎. 高帧频明渠紊流粒子图像测速系统的研制与应用[J]. 水利学报, 2008, 39(7):781-787.WANG Long, LI Danxun, WANG Xingkui. High frame open channel turbulence flow[J]. Journal of Hydraulic Engineering, 2008, 39(7):781-787. (in Chinese)
|
| [11] |
Scarano F, Riethmuller M. Advances in iterative multigrid PIV image processing[J]. Experiments in Fluids, 2000, 29:51-60.
url: http://dx.doi.org/10.1007/s003480070007
|
| [12] |
张兆顺, 崔桂香. 流体力学[M]. 北京:清华大学出版社, 2006.ZHANG Zhaoshun, CUI Guixiang. Fluid Dynamics[M]. Beijing:Tsinghua University Press, 2006. (in Chinese)"
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
2016,
Vol. 56
