Characterizing Coherent Wind Structures using Large-Scale Particle Tracking Velocimetry: A Proof-of-Principle Study

被引:0
|
作者
Rossi, G. A. [1 ]
la Bastide, B. [1 ]
Gaebler, J. [1 ,2 ]
Kinzel, M. [3 ]
Rival, D. E. [1 ]
机构
[1] Univ Calgary, Dept Mech Engn, 2500 Univ Dr NW, Calgary, AB T2N 1N4, Canada
[2] Tech Univ Berlin, Dept Engn Mech, Berlin, Germany
[3] CALTECH, GALCIT, Pasadena, CA USA
来源
SCIENCE OF MAKING TORQUE FROM WIND 2012 | 2014年 / 555卷
关键词
VORTICES;
D O I
10.1088/1742-6596/555/1/012085
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The following study proposes a two-dimensional large-scale particle tracking velocimetry (LS-PTV) system to characterize coherent wind structures. Seven minutes of LS-PTV data is collected via an apparatus that seeds fog-filled soap bubbles into the wind at a height of 6m from the ground. The LS-PTV data is compared to 20 minutes of data collected concurrently from a wind mast at the same site. The LS-PTV system recorded a mean streamwise velocity of 1.35m/s with a standard deviation of 0.23m/s at a mean height of 2.50m with a standard deviation of 0.7m, which agrees well with the velocity profile measured by the wind mast. Furthermore, the Reynolds stresses measured by the LS-PTV system are found to compare to those measured by the wind mast and by Klebanoff [1] for a canonical turbulent boundary layer. The current study assumes that the centre-of-curvature trajectories of the particle pathlines are representative of the trajectories followed by the spanwise vortices. As a proof-of-principle study, this work has been successful in accurately describing the vortex distribution very near to the ground. However, the trajectories followed by the centres-of-curvature belonging to pathlines concurrently passing through the field-of-view were sporadic and uncorrelated.
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页数:8
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