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Multiple scattering of sound by turbulence in water

 

作者: Murray S. Korman,  

 

期刊: The Journal of the Acoustical Society of America  (AIP Available online 1985)
卷期: Volume 77, issue S1  

页码: 22-22

 

ISSN:0001-4966

 

年代: 1985

 

DOI:10.1121/1.2022230

 

出版商: Acoustical Society of America

 

数据来源: AIP

 

摘要:

Experimental results are presented for the scattering of an ultrasonic pulsed beam (f= 1.90 MHz, τ = 200 μs) interacting in the presence of a submerged water jet (diam = 4.8 cm, Re≃5×105). The transmitting 2.54‐cm‐diam PZT transducer unit is located 20 nozzle diameters down‐stream from the jet orifice and is positioned 1 m from the symmetry axis of the jet. The unit is supported by a radius arm so that the incident beam is free to rotate 360° about the symmetry axis of the jet. A 2.54‐cm‐diam stationary receiving unit located 2 m from the jet axis detects the scattered energy pulses. Experimental results are reported for both the scattered energy and the spectral broadening of the incident pulse versus scattering angle. Due to the very short wavelength of sound and relatively large interaction volume of the turbulence the classical scattering theories of Lighthill, Kraichnan, Batchelor, and others, which are valid in the Born approximation, cannot be applied here. Theoretical scattering models including the effects of multiple scattering are discussed using some of the recent theoretical results of R. L. Fante [Radio Sci.17(3), 1521–1530 (1982)]. [Work supported by NRL (Physical Acoustics Branch) and USNA.]

 

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