Undesirable noise in sonar transducers can be due to ambient, electronic, machinery, propulsion, and hydrodynamic sources. This section is concerned with the hydrodynamic sources that cause a spurious output from a sonar transducer known as flowinduced self noise. The term hydrodynamic noise is used when the dynamics of the turbulence creating the noise is very rarely influenced by the compressibility of the medium. In water, the flows are of extremely low Mach number and thus hydrodynamic. A review of the fundamentals of hydrodynamic noise may be found in Ffowcs Williams (1969).
Keywords
Turbulent Boundary Layer Pressure Fluctuation Wall Pressure Wall Pressure Fluctuation Pseudo Noise
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