Performance of various shapes of hydrophones in the reduction of turbulent flow noise

Turbulent boundary layer pressure fluctuations can be reduced by filtering of its wave‐number response with either a finite hydrophone or a hydrophone array, or by filtering the wave‐number response through an elastomer layer. In general practice, various configurations of hydrophone arrays are embedded within a layer of elastomer, thus reducing the turbulent boundary layer pressure fluctuations. The theoretical model considered in this paper is a plane elastomer layer backed by an infinitely rigid surface; the front side of the layer is exposed to turbulent flow. This paper examines the performance of various shapes (square/rectangle, triangle, rhomboid, and circle) of hydrophones flush‐mounted on a rigid surface and embedded within the elastomer layer in reducing the turbulent flow noise. The results presented are numerically calculated noise reductions for various parameters related to hydrophone shapes.Turbulent boundary layer pressure fluctuations can be reduced by filtering of its wave‐number response with either a finite hydrophone or a hydrophone array, or by filtering the wave‐number response through an elastomer layer. In general practice, various configurations of hydrophone arrays are embedded within a layer of elastomer, thus reducing the turbulent boundary layer pressure fluctuations. The theoretical model considered in this paper is a plane elastomer layer backed by an infinitely rigid surface; the front side of the layer is exposed to turbulent flow. This paper examines the performance of various shapes (square/rectangle, triangle, rhomboid, and circle) of hydrophones flush‐mounted on a rigid surface and embedded within the elastomer layer in reducing the turbulent flow noise. The results presented are numerically calculated noise reductions for various parameters related to hydrophone shapes.