초록 ▼

An apparatus is described for producing fluidic jet perturbations for controlling a fluid stream and mix of fluids. The invention is especially applicable to aerodynamic bodies for delaying separation and increasing the maximum angle of attack. The teachings of the invention can easily be converted

An apparatus is described for producing fluidic jet perturbations for controlling a fluid stream and mix of fluids. The invention is especially applicable to aerodynamic bodies for delaying separation and increasing the maximum angle of attack. The teachings of the invention can easily be converted to produce mechanic or mechanical fluidic effects. The apparatus provides simultaneous perturbations applicable for successive perturbations in the longitudinal direction as well as for segmented requirements. However, the invention may be advantageously used in other applications, such as increasing the angle of divergence in diffusers, controlling and increasing the mixing rate of fluids in the mixing process without adding any mass, and vectoring fluid streams. It can also be applied, among others uses, for a windshield defogger or a vortex generator.

대표청구항 ▼

[ What is claimed is:] [1.] An active apparatus for producing and generating controlled fluidic perturbations to be induced in a boundary layer flow and in a fluid stream for controlling and changing characteristics of boundary layer separation and flow characteristics in bounded and unbounded flow

[ What is claimed is:] [1.] An active apparatus for producing and generating controlled fluidic perturbations to be induced in a boundary layer flow and in a fluid stream for controlling and changing characteristics of boundary layer separation and flow characteristics in bounded and unbounded flow fields, said active apparatus including (a) at least one stepped cantilever piezoelectric actuator comprising a vibrating tip and secured to a support plate, said at least one stepped cantilever piezoelectric actuator having a resonance frequency, and (b) activating means for causing said vibrating tip to periodically vibrate around its steady state position without any stable position when activated at or near said resonance frequency.