NDLI: Micro Pulsatile Jets for Thrust Optimization

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Tiffany, J. Finley Mohseni, Kamran
Copyright Year	2004
Abstract	Thrust optimization of micro-synthetic pulsatile jets is studied. Cylindrical cavities with a small circular orifice at one end, and a vibrating diaphragm at the other are used for thrust generation. The governing parameters are identified and the tradeoffs between electrostatic, piezoelectric, and electromagnetic actuation methods are investigated. Optimization of the micro jets requires a solution that gives maximum diaphragm displacement while minimizing voltage. The size of the orifice diameter is chosen to maintain a formation number of 4, at which the length of an expelled slug of fluid from the exit orifice is four times the diameter of orifice. This relationship maximizes the circulation and impulse in the leading vortex rings generated by the actuator. To examine the effects of cavity dimensions, a number of actuators are constructed out of aluminum with various cavity diameter, cavity height, and orifice diameters. Piezoelectric disks bonded to brass shims are used for actuation. The jets are tested in air at various actuation voltage and wave-shape functions. Maximum thrust generation is achieved at the resonant frequency of the cavity. Hot wire anemometry is used to further characterize the jet flow field. An investigation into electrostatic, piezoelectric, and electromagnetic diaphragm actuation methods revealed that electromagnetic actuation provides the maximum diaphragm displacement using a constant voltage.
Sponsorship	Fluids Engineering Division
Starting Page	725
Ending Page	733
Page Count	9
File Format	PDF
ISBN	0791847098
DOI	10.1115/IMECE2004-62042
Volume Number	Fluids Engineering
Conference Proceedings	ASME 2004 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2004-11-13
Publisher Place	Anaheim, California, USA
Access Restriction	Subscribed
Subject Keyword	Synthetic jet Electromagnetic actuation Zero-net-mass-flux Electrostatic actuation Piezoelectric actuation Actuators Aluminum Diaphragms (structural) Dimensions Wire Waves Optimization Displacement Brass (metal) Cavities Fluids Diaphragms (mechanical devices) Slug flows Tradeoffs Vortices Jets Disks Resonance Shapes Thrust Impulse (physics)
Content Type	Text
Resource Type	Article

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