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Jet pumps create a pressure drop in oscillatory flow, making them effective streaming suppressors in thermoacoustic devices. This study optimizes jet pump design using numerical simulations for improved performance.

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Area of Science:

  • Fluid dynamics
  • Acoustics

Background:

  • Tapered cylindrical tube sections, known as jet pumps, exhibit asymmetric hydrodynamic end effects under oscillatory flow.
  • These effects lead to a time-averaged pressure drop, enabling their use as streaming suppressors in closed-loop thermoacoustic devices.

Purpose of the Study:

  • To numerically characterize oscillatory flow through various jet pump geometries.
  • To investigate the impact of geometric parameters on jet pump performance, specifically time-averaged pressure drop and acoustic power dissipation.
  • To develop scaling parameters and design guidelines for optimizing jet pump performance.

Main Methods:

  • A two-dimensional axisymmetric computational fluid dynamics (CFD) model was employed.
  • A comprehensive parameter study was conducted on numerous conical jet pump geometries.
  • Key geometric parameters analyzed include length, taper angle, waist diameter, and waist curvature.

Main Results:

  • Four distinct flow regimes were identified, correlating with jet pump performance.
  • Dimensionless parameters were successfully introduced to scale the performance across different jet pump geometries.
  • Comparison with quasi-steady theory revealed its limited applicability to a narrow operational range.

Conclusions:

  • The study provides a framework for understanding and optimizing jet pump performance in oscillatory flow.
  • Established scaling parameters and design guidelines facilitate the development of more efficient jet pumps for thermoacoustic applications.
  • Numerical simulations offer a robust method for characterizing complex fluid dynamics in jet pump devices.