Acta Mechanica Slovaca 2023, 27(1):40-47 | DOI: 10.21496/ams.2023.019

Numerical Modelling of Flow in Fluidic Oscillator

Tomáš Blejchař ORCID...^{1, *}, Sylva Drábková ORCID...¹, Václav Janus²

¹ VSB -Technical University of Ostrava, Faculty of Mechanical Engineering, 17. listopadu 2172/15, 70800 Ostrava

² VSB -Technical University of Ostrava, Faculty of Electrical Engineering, 17. listopadu 2172/15, 70800 Ostrava

The systems with fluidic oscillators are intensively studied nowadays because the oscillatory flow can increase heat and mass transfer and decrease energy dissipation. Fluidic oscillators produce an active-type mixing enhancement but in a passive manner as they do not require any moving parts. They convert steady pressurized inlet flow to oscillatory or pulsatile flow at an outlet without the need for external power. In general, there are many types of fluidic oscillators, categorized by the underlying mechanism to create oscillatory output behaviour. The fluidic oscillator with the single feedback loop is analysed in this paper. A numerical simulation of oscillating flow is performed and two approaches for modelling flow, RANS, and LES are applied especially. The results of numerical simulation are compared with experimental measurement. The analysis is focused on pressure drop and oscillation frequency dependent on the inlet conditions. The energy spectrum of oscillating flow is analysed using discrete Fourier transform.

Keywords: fluidic oscillator; single feedback loop; oscillation frequency; numerical modelling; measurement.

Received: February 9, 2023; Revised: February 27, 2023; Accepted: March 3, 2023; Published: March 24, 2023  Show citation