Performance characteristic curve insensitive to feedback fluidic oscillator configurations

The effects of different geometrical factors such as the jet nozzle exit width, feedback channel width, oscillator depth, and the oscillating chamber shape on the feedback fluidic oscillator performance were investigated experimentally. A characteristic curve relating to only the oscillation frequency f and Reynolds number Re was found to be insensitive to the oscillator configurations and is expressed as f (Hz) = 6.05 exp(−α/3.30) + 14.5 exp(−α/0.859) + 0.669, where α = ln(Re)/f. The characteristic curve can be used to determine the Reynolds number and thereby the flowrate through the oscillators according to the detected oscillation frequency.