10 April 2010 Broadband pulsed flow using piezoelectric microjets
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Abstract
A piezohydraulic microjet design and experimental results are presented to demonstrate broadband active flow control for applications on various aircraft structures including impinging jets, rotor blades, cavity bays, etc. The microjet actuator includes a piezoelectric stack actuator and hydraulic circuit that is used to throttle a 400 μm diameter microjet using hydraulic amplification of the piezoelectric stack actuator. This system is shown to provide broadband pulsed flow actuation up to 800 Hz. Unsteady pressure measurements of the microjet's exit flow are coupled with high-speed phase imagery using micro-Schlieren techniques to quantify the flow field. These results are compared with in situ stack actuator displacements using strain gauge measurements.
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Joshua Hogue, John Solomon, Michael Hays, Farrukh Alvi, William Oates, "Broadband pulsed flow using piezoelectric microjets", Proc. SPIE 7643, Active and Passive Smart Structures and Integrated Systems 2010, 76431V (10 April 2010); doi: 10.1117/12.847560; https://doi.org/10.1117/12.847560
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Actuators

Microfluidics

Transducers

Control systems

Cameras

Interfaces

Visualization

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