Results 151 to 160 of about 110,436 (201)

A Jet Formation Criterion for Synthetic Jet Actuators

41st Aerospace Sciences Meeting and Exhibit, 2003
This 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, Ryan Holman, Rajat Mittal, Bruce Carroll, Mark Sheplak, Lou Cattafesta   +5 more
openaire   +1 more source

Noise Characteristics Contrastive Analysis of Dual Synthetic Jets Actuator and Synthetic Jet Actuator

2021
Dual synthetic jets actuator (DSJA) has great potential application in airfoil separation flow control, jet vector control, heat dissipation and other aspects. However, DSJA can make noise of more than 80 dB under the optimal working frequency, which is very unfavorable for the application of DSJA in practical engineering.
Wu Pan, Luo Zhenbing, Peng Wenqiang, Zheng Mu, Kang Ying   +4 more
openaire   +1 more source

Directional control of a jet using synthetic jets

AIP Conference Proceedings, 2017
The 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, Alexandru Cătălin Macovei, Alexandru Dumitrache, Daniel Crunteanu   +3 more
openaire   +1 more source

Characterization of Synthetic Jet Resonant Cavities

2014
The 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, GIRFOGLIO, MICHELE, CHIATTO, MATTEO, COPPOLA, GENNARO   +3 more
openaire   +2 more sources

Synthetic jets with piezoelectric diaphragms

SPIE Proceedings, 2005
Piezoelectric 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
openaire   +1 more source

Pulsating and synthetic impinging jets

Journal of Visualization, 2005
This is the second part of a survey summarizing authors' research over a period of two decades on enhancing impinging jet heat and/or mass transfer by periodic unsteadiness of nozzle flow rate. The first part, Tesar and Travnicek (2004 b), identified the reasons why pulsation does not always improve the transfer rate: the pulses do not reach up to the ...
V. Tesař, Z. Trávníček
openaire   +1 more source

Vectoring of Adjacent Synthetic Jets

AIAA Journal, 2005
The formation, evolution, and interactions of a closely spaced pair of coflowing rectangular synthetic jets are investigated using particle image velocimetry. The dynamics of the combined jet is determined by the interactions of the counter-rotating vortex pairs that form each jet.
Barton L. Smith, Ari Glezer
openaire   +1 more source

Microfabricated Electrodynamic Synthetic Jet Actuators

Journal of Microelectromechanical Systems, 2018
This paper presents the design, fabrication, and characterization of a chip-scale electrodynamic synthetic jet actuator with batch-fabricated die components. The actuator is an assembly of two dies with a plastic spacer sandwiched in between. The top die consists of a copper micro-coil and an orifice through which the jet is synthesized. The bottom die
Shashank G. Sawant, Benjamin George, Lawrence S. Ukeiley, David P. Arnold   +3 more
openaire   +1 more source

Electronic Cooling Using Synthetic Jets

Heat Transfer: Volume 4, 2005
Efficiency of synthetic jet impingement cooling and the mechanisms of heat removal from a constant heat flux surface were investigated experimentally. The effects of jet’s formation frequency and Reynolds number at different nozzle-to-surface distances were investigated and compared to steady jet cooling.
Anna A. Pavlova, Michael Amitay
openaire   +1 more source

Instability Process in Synthetic Jets

49th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2011
This paper discusses the instability process in synthetic jets and how they transitioned into turbulent continuous flow. Axisymmetric synthetic jet was investigated and the results were compared against conventional turbulent jet and previous studies for synthetic jet.
Liran Oren, John Cha, Ephraim Gutmark, Sid Khosla   +3 more
openaire   +1 more source