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Fluidic Oscillators, Feedback Channel Effect under Compressible Flow Conditions.

Josep M Bergadà1, Masoud Baghaei1, Bhanu Prakash2,3

  • 1Fluid Mechanics Department, Universitat Politècnica de Catalunya, 08034 Barcelona, Spain.

Sensors (Basel, Switzerland)
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Summary
This summary is machine-generated.

This study reveals how feedback channel length impacts fluidic oscillator performance. Longer channels decrease oscillation frequency, and pressure waves are key drivers of jet oscillations.

Keywords:
3D-Computational Fluid Dynamics (CFD)Direct Numerical Simulation (DNS)boundary layercompressible flowfeedback channel performanceflow controlfluidic oscillators

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Area of Science:

  • Fluid Dynamics
  • Acoustics
  • Mechanical Engineering

Background:

  • Fluidic oscillators are versatile devices used for force modification and sensing.
  • The effect of feedback channels on oscillator performance, particularly under compressible flow, remains unclear.

Purpose of the Study:

  • To investigate the influence of feedback channel length on fluidic oscillator outlet mass flow frequency and amplitude.
  • To elucidate the role of pressure waves in driving jet oscillations within the oscillator.

Main Methods:

  • Three-dimensional Direct Numerical Simulations (DNS) were employed.
  • Compressible flow conditions were simulated with varying feedback channel lengths and inlet Reynolds numbers (Re = 12,410 and 18,617).

Main Results:

  • Increased inlet velocity led to higher outlet mass flow frequency and amplitude.
  • Extended feedback channel length reduced oscillation frequency, with oscillations ceasing beyond a certain threshold.
  • Pressure waves were observed traveling through feedback channels and influencing the mixing chamber jet.

Conclusions:

  • Jet oscillations in fluidic oscillators are fundamentally pressure-driven.
  • Feedback channel length is a critical parameter controlling oscillator frequency and stability.
  • The study provides crucial insights into the physics governing fluidic oscillator dynamics under compressible flow.