High-flow oscillator

A single phase fluidic oscillator for use in a fluidic spray device, said oscillator comprising:

• a body portion having a centerline and first and second levels and an outlet opening;
• an interaction chamber in said first level and having inlet and outlet ends;
• a supply nozzle having a given aspect-ratio and a width that is less than or equal to the width of said outlet opening and entering directly into said inlet end of said interaction chamber;
• an inlet plenum having a minimum ratio of cross-sectional area to aspect-ratio of about 2.67;
• means for connecting said inlet plenum to said supply nozzle;
• a fluid passage symmetrically located with respect to said centerline and at least partly in said second level of said body portion;
• connecting passages for connecting said fluid passage to said inlet end of said interaction chamber, one of said connecting passages being located on either side of said supply nozzle;
• said interaction chamber having a neck portion that is wider than the width of said supply nozzle;
• said interaction chamber also having sidewalls extending from said inlet end to said outlet end, the inlet ends of said sidewalls being spaced from said supply nozzle and separated therefrom by said connecting passages;
• said sidewalls converging from said inlet end toward said neck portion and thereafter diverging and then converging again at said outlet end to form a concavity between said neck portion and said outlet;
• said concavity being wider than the width of said outlet opening and said neck portion;
• whereby a jet from said supply nozzle travels from said inlet end, through said interaction chamber and out of said outlet opening while a fluid column, located between said jet flow and said sidewalls, moves cyclically back and forth in said fluid passage and said connecting passages, and the fluid from said outlet opening has a low ratio of oscillation frequency to the overall length of said oscillator from said plenum to said outlet.