Probability Density Measurements in a Curved Mixing Layer
作者:
William H. Snyder,
David P. Margolis,
期刊:
Physics of Fluids(00319171)
(AIP Available online 1967)
卷期:
Volume 10,
issue 5
页码: 963-969
ISSN:0031-9171
年代: 1967
DOI:10.1063/1.1762248
出版商: AIP
数据来源: AIP
摘要:
Probability density measurements of the turbulent velocities were made at several positions in a curved mixing layer. The probability densities reveal the intermittent nature of the flow, which is fully turbulent in the center of the mixing layer but nonturbulent far away from the mixing layer. By using an ``intermittency analyzer'' in combination with a pulse height analyser, the statistical properties of the ``fully turbulent'' flow were obtained. An important result of this study is that the ``apparent'' transfer of energy, which appeared to be up the energy gradient, is actually due to a difference in mean velocity between the fully turbulent and nonturbulent fluid. The nonturbulent fluid contained within the convex bulges of turbulent fluid fluctuates wildly in velocity, but is almost free of vorticity.
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