Acoustic Lagrangian velocity measurement in a turbulent air jet

被引：0
|
作者：
P. Gervais
C. Baudet
Y. Gagne
机构：
[1] Laboratoire des écoulement géophysiques et industriels,
[2] LEPTAB,undefined
来源：
Experiments in Fluids | 2007年 / 42卷
关键词：
Streamwise Velocity; Stokes Number; Probability Density Function; Downstream Position; Lagrangian Velocity;
D O I：
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中图分类号：
学科分类号：
摘要：
Measuring Lagrangian velocities in a turbulent flow is of a great interest for turbulence modeling. We report measurements made in an axisymmetric turbulent air jet at Reynolds number Rλ ≃ 320, using acoustical Doppler scattering. Helium-filled soap bubbles are used as Lagrangian tracers. We describe an experimental setup which allows the simultaneous measurement of the full three-component Lagrangian velocity and the longitudinal Eulerian one. Lagrangian velocity probability density functions (PDF) are found Gaussian, close to Eulerian ones. Velocity correlations are analysed as well as the statistical dependence between components.
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页码：371 / 384
页数：13
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