AN EXPERIMENTAL-STUDY OF WEAK TURBULENCE

被引：22

作者：

PAK, HK

GOLDBURG, WI

SIRIVAT, A

机构：

[1] Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh

[2] Department of Mechanical Engineering, University of Pittsburgh, Pittsburgh

来源：

FLUID DYNAMICS RESEARCH | 1991年 / 8卷 / 1-4期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0169-5983(91)90028-H

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

Photon homodyne correlation spectroscopy (HCS) and laser Doppler velocimetry (LDV) have been used to study turbulent velocity fluctuations V(R) associated with eddies of size R. The turbulence was produced by a grid in a water tunnel. For small R, both types of measurement were consistent with a model in which the active regions of turbulence lie on a fractal of dimension D, with D increasing from almost-equal-to 2 to almost-equal-to 3 as the Reynolds number (Re) increases above some threshold value. At larger eddy sizes, the LDV measurements show a different scaling of the velocity fluctuations. We associate these larger eddies with the energy reservoir that feeds the inertial cascade. The scaling exponent for this "energetic" subrange is also a function of Re.

引用

页码：19 / 31

页数：13

共 13 条

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