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Analysis of Turbulent Density Fluctuations by the Shadow Method

 

作者: Mahinder S. Uberoi,   Leslie S. G. Kovasznay,  

 

期刊: Journal of Applied Physics  (AIP Available online 1955)
卷期: Volume 26, issue 1  

页码: 19-24

 

ISSN:0021-8979

 

年代: 1955

 

DOI:10.1063/1.1721855

 

出版商: AIP

 

数据来源: AIP

 

摘要:

Shadow pictures of turbulent flow regions give a particular kind of information about the three‐dimensional density field. If homogeneity and isotropy of the fluctuation field can be assumed, the statistical properties of the picture uniquely determine the correlation function or power spectrum of the three dimensional turbulent density field. Shadow pictures obtained in the wake of a supersonic projectile were analyzed in this manner and encouraging results were obtained. In order to check the validity of the method, the density fluctuations in a heated jet were measured both by the shadow method and by the more conventional hot‐wire technique.

 

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