Synthetic jet actuators are used to produce net axial momentum flow without net mass flux. Through strategic application, such devices can be used for flow control, propulsive thrust, and cooling. A novel application uses a variable-diameter orifice to constrict the exiting flow, and the motion can be synchronized with the pulse of the jet. This device is examined using phase-locked particle image velocimetry (PIV), permitting investigation of the flow fields and momentum flow. When compared to fixed-diameter synthetic jets, the variable-diameter actuator produces a larger vortex ring that lingers nearer the aperture. In addition, the experiments show increased momentum when the aperture is contracted in phase with the pulsing jet, with peak levels more than twice that of a constant-diameter jet.
Examination of a Variable-Diameter Synthetic Jet
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received June 29, 2015; final manuscript received June 8, 2016; published online August 11, 2016. Assoc. Editor: Mark F. Tachie.
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Albright, S. O., and Solovitz, S. A. (August 11, 2016). "Examination of a Variable-Diameter Synthetic Jet." ASME. J. Fluids Eng. December 2016; 138(12): 121103. https://doi.org/10.1115/1.4033912
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