Results 211 to 220 of about 2,458 (258)
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On the near field of an axisymmetric synthetic jet
Fluid Dynamics Research, 2007The axisymmetric synthetic jet produced by an oscillating piston has been investigated experimentally. The study was performed in water using digital particle image velocimetry for the instantaneous velocity planar measurements. The near field, up to x/d0 ≈ 6, was investigated for three different Reynolds numbers.
DI CICCA, Gaetano Maria, IUSO, Gaetano
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Modelling of the Characteristics of Synthetic Jet Actuators
35th AIAA Fluid Dynamics Conference and Exhibit, 2005In this paper, a simple static compressible model and a dynamic incompressible model for circular synthetic jet actuators are described. They are used to investigate the effect of changing actuator geometrical and operating parameters on the magnitude of jet peak velocity at the orifice exit.
Tang, H., Zhong, S.
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Plasma Synthetic Jet for Flow Control
40th Fluid Dynamics Conference and Exhibit, 2010The necessity of having an efficient actuator to control flow has driven ONERA to develop a pioneer actuator called Plasma Synthetic Jet (PSJ). This actuator was inspired by the John Hopkins University device. It produces a high exhaust velocity jet using electrical power.
Hardy, Pierrick +5 more
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Two-Dimensional Synthetic Jet Simulation
AIAA Journal, 2000Direct numerical simulation was used to model an array of two-dimensional synthetic slot jets pulsing into initially quiescent e ow. Such zero-net mass-e ux jets can represent an array of microelectromechanical systems. Fluid ejected by the pulsing jets rolls up into vortex pairs that propagate as a result of their mutually induced velocity ...
Conrad Lee, David Goldstein
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Measurements of Synthetic Jets in a Boundary Layer
2008PIV measurements along the centerline of a synthetic jet embedded in a flat plate boundary layer were conducted for three types of jet vortex structures identified by the authors in previous flow visualization studies, namely hairpin vortices, stretched vortex rings and tilted vortex rings. The primary purpose of this work was to quantify the near wall
Jabbal, M, Zhong, Shan
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Visualization study of hybrid synthetic jets
Journal of Visualization, 2014A synthetic jet (SJ) is a fluid flow that is created from an oscillatory process of suction and blowing. A hybrid synthetic jet (HSJ) combines this principle with fluidic pumping through a valveless pump. The present study addresses round HSJs issuing into quiescent surroundings from an actuator orifice 8 mm in diameter.
Zuzana Broucková, Zdenek Trávnícek
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Visualization of synthetic jet formation in air
Journal of Visualization, 2015This experimental study deals with a round synthetic jet (SJ) issuing into quiescent surroundings. Flow visualization in air is used to identify different flow field regimes. Hot-wire anemometry and theoretical evaluations are used to quantify parameters in terms of the Reynolds (Re) and Stokes (S) numbers.
Zdenek Trávnícek +3 more
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Modified flapping jet for increased jet spreading using synthetic jets
International Journal of Heat and Fluid Flow, 2011Abstract The present paper is an experimental investigation, using a PIV system, on modified rectangular jet flow co-flowing with a pair of synthetic jets placed symmetrically with respect to the geometric centerline of the main flow. The objective was to determine the optimal forcing conditions that would result in jet spreading beyond what would be
Maher Ben Chiekh +2 more
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Characterization of Synthetic Jet Resonant Cavities
2014The acoustic properties of piezo-electric driven resonant cavities usually employed to generate the so-called synthetic jets are analytically and numerically investigated in order to characterize the performances of such devices. It is shown that the actuator behaves as a two-coupled oscillators system and the dimensionless form of the governing ...
DE LUCA, LUIGI +3 more
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Synthetic jets with piezoelectric diaphragms
SPIE Proceedings, 2005Piezoelectric diaphragms are used as synthetic jets because of their size, rapid time response, and relatively low power consumption. Among the piezoelectric diaphragms used are unimorphs and Bimorphs. In this study, a bimorph diaphragm, a thin Unimorph pre-stressed device and a Radial Field Diaphragm (RFD) are compared.
Poorna Mane, Karla Mossi, Robert Bryant
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