US Patent 7472848 Cold-performance fluidic oscillator

A fluidic oscillator suitable for use at colder temperatures for generating an exhaust flow in the form of an oscillating spray of fluid droplets has an inlet for pressurized fluid, a pair of power nozzles configured to accelerate the movement of the pressurized fluid, a fluid pathway that connects and allows for the flow of pressurized fluid between its inlet and the power nozzles, an interaction chamber which is attached to the nozzles and receives the flow from the nozzles, a fluid outlet from which the spray exhausts from the interaction chamber, and, at each power nozzle, a step in the height elevation of the floor of the power nozzle with respect to that of the interaction chamber for increasing the instability of the flow from the power nozzles.