Valves with flow control by synthetic jets

Tesař, Václav; Broučková, Zuzana; Kordík, Jozef; Trávníček, Z.; Peszyński, K.

doi:10.1051/epjconf/20122501092

Cited by 7 publications

(5 citation statements)

References 7 publications

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“…The present paper focuses on another variant of that case -an annular IJ controlled by means of a system of twelve slot SJs. Results of some preliminary experiments with this annular jet, without the impingement effects, were presented recently in [29,30]. Figure 1 shows the schematic view of the annular nozzle tested in the present study.…”

Section: Introductionmentioning

confidence: 92%

Annular Impinging Jet Controlled by Radial Synthetic Jets

Trávníček

Tesař

Broučková

et al. 2014

Heat Transfer Engineering

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This experimental study focuses on generation and control of annular impinging jets. An annular nozzle was designed with an active flow control system using twelve radial synthetic jets issuing from the central body of the nozzle. Measurements of the wall pressure and wall mass transfer were performed with air as the working fluid. The control action causes modification of the flowfield resulting in changes of the corresponding heat/mass transfer distributions. The convective transfer rate on the stagnation circle can be demonstrably enhanced by 20% at a moderate nozzle-to-wall distance, equal to 0.6 of the nozzle outer diameter.

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Section: Introductionmentioning

confidence: 92%

Annular Impinging Jet Controlled by Radial Synthetic Jets

Trávníček

Tesař

Broučková

et al. 2014

Heat Transfer Engineering

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“…The environmental fluid fills the SJA cavity during the ingestion phase. Thanks to formation of the edge vortices, the SJs are used in many fields of technology including: aviation [1,2], transport [3,4], heat transport [5][6][7], active flow control [7][8][9] and so on. Due to many applications, SJs are produced with the use of many types of different actuators (in terms of construction and type) so as to increase the SJ efficiency or velocity.…”

Section: Introductionmentioning

confidence: 99%

Synthetic jet actuator with two opposite diaphragms

Smyk

Wawrzyniak

Peszyński

2020

Mechanics and Mechanical Engineering

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The synthetic jet actuators are one of the most investigated types of actuators used in heat transfer and active flow control. The energetic efficiency of actuators is a key parameter determining the possibility of device use. The actuators with two or more diaphragms have higher efficiency than the actuators with only one. The paper presents the investigations of the acoustic synthetic jet actuator with two opposite diaphragms. In the paper, synthetic jet velocity, Reynolds number and the energetic efficiency as a function of oscillating actuator frequency, for a different cavity, orifice configuration and one real input power P0 = 2 W were studied. The possibility of theoretical calculation of first and second resonance frequency were checked. The coupling ratio for actuators was calculated. The maximum energetic efficiency was η = 8.67% and Reynolds number Re = 8503. The possibility of using the same dependencies and rules during the design of actuators with two opposite diaphragms as in the case of actuators with one diaphragm was demonstrated. The results may be useful in the design of the actuators of the two membranes.

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“…SJs are used mainly in active flow control (Tesař et al, 2012;Trávnícek et al, 2014) and in cooling systems (Trávníček & Tesař, 2003). The possibility of them application most often depends on SJs momentum flux and velocity.…”

Section: Introductionmentioning

confidence: 99%

Comparison of acoustic synthetic jet actuator with one and two diaphragms

2018

Engineering Mechanics

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The paper investigates the synthetic jet actuators based on similar geometries but with another number of diaphragms or them operates conditions: one ediaphragm, one diaphragm with damped chamber or both diaphragm together. The actuators operates close to first resonance frequencies and was supply by a harmonic power input. The characteristic velocity as function of the input real power were measured. On this basis, approximate values of momentum flux, kinetic energy and efficiency were determined. The paper presented benefits of using synthetic jets actuator with two diaphragms. The used of two diaphragms increase the value of, momentum flux about 79.62%, kinetic energy about 140.72% and energetic efficiency about 140.72% relative to actuator with one undamped diaphragm by the same value of real power input.

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Valves with flow control by synthetic jets

Cited by 7 publications

References 7 publications

Annular Impinging Jet Controlled by Radial Synthetic Jets

Annular Impinging Jet Controlled by Radial Synthetic Jets

Synthetic jet actuator with two opposite diaphragms

Comparison of acoustic synthetic jet actuator with one and two diaphragms

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