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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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