Investigation of fluidic oscillator performance improvements by modifying interior chamber with a backward facing step geometry

Abstract

A computational method is used to model the BFSFO with variations in LR and HR to make it more efficient with high frequency and low average pressure drop. BFSFO LR 0.402 HR 0.4 outperformed the other variations with a frequency increase of 33.17% compared to the clean fluidic oscillator. The increase in frequency of BFSFO LR 0.402 HR 0.4 relative to the BFSFO baseline is 8.95%. The average pressure drop is 1.27% higher than clean fluidic oscillator. The decrease in the average pressure drop of BFSFO LR 0.402 HR 0.4 relative to the BFSFO baseline is 15.21%. The oscillation frequency increased due to the fluid flow with higher momentum in the upper and lower feedback channels. The circulation bubble in BFSFO LR 0.402 HR 0.4 is smaller than that in the BFSFO baseline, resulting in a lower average pressure drop.