High-frequency fluidic oscillator

•New solution for no-moving-part oscillation generation.•Interaction of a wall-attaching air jet with captive steadily rotating vortex.•Constant Strouhal number regime at Reynolds numbers from Re ∼2600 to Re ∼6000.•Oscillating from ∼1.7 kHz to ∼5 kHz.

There is a number of potential applications for no-moving-part fluidic oscillators if they could oscillate in the kilohertz range and yet be of convenient, i.e. not too small size. The solution offered in this paper is based on a new oscillation principle, with stationary rotating vortex inside the chamber bounded by two attachment walls. The response to gradually increasing air flow rate has shown three distinct regimes, of prime importance being the constant Strouhal number regime at small Reynolds numbers from Re ∼2600 to Re ∼6000, oscillating at f = 1.7 kHz and f ∼ 5 kHz, respectively. Even higher frequency f ∼ 8.2 kHz was found in another, higher Re regime.