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Area of Science:

  • Acoustics
  • Fluid Dynamics
  • Wave Propagation

Background:

  • Acoustic cloaking research has primarily focused on stationary fluids.
  • The influence of fluid flow (convection) on acoustic cloaking has been largely overlooked.
  • Understanding convection effects is critical for practical acoustic cloaking applications.

Purpose of the Study:

  • To investigate the necessity of accounting for convection in acoustic cloaking.
  • To demonstrate active acoustic cloaking in a convected flow field.
  • To analyze the performance of cloaking under different incident sound fields.

Main Methods:

  • Developing an active acoustic cloaking system for a rigid body in a convected flow.
  • Utilizing circumferentially arranged monopole control sources to generate a secondary acoustic field.
  • Implementing destructive interference between the primary scattered field and the secondary field.
  • Testing with two incident fields: a plane wave and a monopole source.

Main Results:

  • Accounting for convection is critical for effective acoustic cloaking in fluid flow.
  • Active cloaking in a moving fluid necessitates a convected cloak.
  • The performance of the convected cloak is dependent on the Mach number of the fluid flow.

Conclusions:

  • Convection significantly impacts acoustic cloaking, making stationary fluid assumptions inadequate.
  • Active acoustic cloaking in moving fluids requires a specialized convected cloak design.
  • The Mach number is a key parameter determining the success of acoustic cloaking in convected flows.