Results 241 to 250 of about 32,400 (296)
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Axisymmetric coaxial synthetic jets
40th AIAA Aerospace Sciences Meeting & Exhibit, 2002Measurements were made in the near field of piston driven axisymmetric coaxial synthetic jets emanating from an orifice and a surrounding annulus of equal exit areas and cavity volumes. Piston velocity, amplitude, radial spacing between the orifice and the annulus, and exit angles had a strong influence on the dominant features of the flow.
Z. Bangash, A. Ahmed
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Sensors and Actuators A: Physical, 2012
Abstract This paper is a sequel to several recent papers that analysed experimental data on axisymmetric synthetic jets using similarity transformation of governing equations involving a one-equation model of turbulence. Unusual feature there is variation of parameters (“constants”) in transformed equations along the synthetic jet axis. Interestingly,
Václav Tesař, Jozef Kordík
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Abstract This paper is a sequel to several recent papers that analysed experimental data on axisymmetric synthetic jets using similarity transformation of governing equations involving a one-equation model of turbulence. Unusual feature there is variation of parameters (“constants”) in transformed equations along the synthetic jet axis. Interestingly,
Václav Tesař, Jozef Kordík
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Displacement amplified synthetic jets
SPIE Proceedings, 2014Synthetic ynthetic jet actuators are attractive devices for active flow control because, in contrast to many other actuators, they do not require a pressurized air source. Instead, they cyclically ingest and expel air from the external flow that is being controlled.
Steve Griffin +2 more
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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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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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A comparison between synthetic jets and continuous jets
Experiments in Fluids, 2003Experimental measurements and flow visualiza- tion of synthetic jets and continuous jets with matched Reynolds numbers are described. Although they have the same profile shape, synthetic jets are wider and slower than matched continuous jets. The synthetic jets are ex- amined at higher Reynolds numbers than previously studied and over a large range of ...
B. L. Smith, G. W. Swift
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A Jet Formation Criterion for Synthetic Jet Actuators
41st Aerospace Sciences Meeting and Exhibit, 2003This paper proposes and validates a jet formation criterion for synthetic jet actuators. The synthetic jet is a zero net mass flux device, adding additional momentum but no mass to its surroundings. Jet formation is defined as a mean outward velocity along the jet axis and corresponds to the clear formation of shed vortices.
Yogen Utturkar +5 more
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Directional control of a jet using synthetic jets
AIP Conference Proceedings, 2017The paper presents an application of synthetic jets in the flow control of a jet. The synthetic jet actuator consists of an oscillating membrane operating at high frequency and separating two cavities with exit slots of different geometries. The synthetic jets work as an alternating push-pull system and the generated vortical structure changes the flow
Florin Frunzulica +3 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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