NDLI: Development of a Variable Diameter Synthetic Jet Actuator

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Spencer, O. Albright Stephen, A. Solovitz
Copyright Year	2014
Abstract	Synthetic jet actuators use oscillating motion near a fixed orifice to produce a net axial momentum flux with zero net mass flux. Through strategic application, these devices can provide flow control, propulsive thrust, and impingement cooling. To improve this performance, a new actuator has been designed with a variable orifice size, which can potentially increase exit flow speeds. The jet is generated using a pneumatic cylinder, which is oscillated linearly near an orifice. The opening consists of a camera aperture, whose diameter can decrease by a factor of 18 with the aid of a second pneumatic cylinder. The system is capable of operating at frequencies up to 5 Hz while maintaining full piston stroke, and the phase between the piston and orifice motion can be varied from 0 to 180 degrees. The flow structure is investigated using phase-locked particle image velocimetry (PIV), which shows that simultaneous constriction of the exit can substantially increase the exit speed. The initial design is used with air flow but will be extended to water applications in the future.
File Format	PDF
ISBN	9780791846421
DOI	10.1115/IMECE2014-36936
Volume Number	Volume 1: Advances in Aerospace Technology
Conference Proceedings	ASME 2014 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2014-11-14
Publisher Place	Montreal, Quebec, Canada
Access Restriction	Subscribed
Subject Keyword	Pistons Design Water Actuators Air flow Pneumatic cylinders Impingement cooling Particulate matter Flow control Momentum Flow (dynamics) Thrust
Content Type	Text
Resource Type	Article

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