Variable-Frequency Fluidic Oscillator Driven by a Piezoelectric Bender

§This paper describes a new actuator for flow control applications ‐ the piezo-fluidic oscillator. The actuator is a fluidic device based on wall-attachment of a fluid jet, and modulated by piezoelectric devices. The piezo-fluidic oscillator successfully decouples the operating frequency from the flow characteristics of the device. The frequency is specified by an input electrical signal that is independent of pressure, making this actuator ideal for closed-loop control applications. The oscillator exhibits high bandwidth (up to 1.2 kHz), modulation rates up to 100%, and a velocity range reaching sonic conditions. Furthermore, the bi-stable actuator may be operated in a steady state, with momentum flux in one of two desired directions. The piezo-fluidic oscillator may be used in flow control applications where synthetic jets cannot provide enough momentum for control authority. The actuator can also be used as an alternative to traditional aircraft control surfaces while operating in the steady bi-directional mode. This paper details the design and characterization of the piezo-fluidic oscillator. The dynamic response characteristics are evaluated with flow visualization and hot film probe measurements on the output. **

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