Special Issue "Flow Control by Means of Synthetic Jet Actuators"

A special issue of Actuators (ISSN 2076-0825).

Deadline for manuscript submissions: 20 December 2021.

Special Issue Editor

Prof. Dr. Luigi de Luca
E-Mail Website
Guest Editor
Department of Industrial Engineering, University of Naples “Federico II”, 80125 Napoli (NA), Italy
Interests: thermo-fluid dynamic stability; flow control; synthetic jet actuators; free surface flows
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The need for flow control is widely recognized in various fields of technological applications such as fluid dynamics, heat transfer, combustion, atomization, and others. The common goal to be achieved is the maximization of the performance of the engineering systems under design, for both safety and energy consumption reduction purposes. A class of modern active control actuators is clustered under the common term synthetic jet (SJ), meaning that the jet is synthetized within the fluid to be controlled without the use of any traditional pumping device. Piezo-driven and plasma (i.e., spark and dielectric barrier discharge (DBD)) actuators are currently the object of theoretical and experimental investigations. The recent literature has provided a huge amount of contributions related to the basic characterization of such devices, whilst the current ongoing research is devoted to various applications of flow control, addressing specific needs and issues. The aim of the present Special Issue is to collect original papers concerned with the application of various types of SJ actuators to flow control, without any limitation on the specific application field. Theoretical, numerical and experimental contributions are welcome, provided they deal with the interaction between the jet and the external fluid current to be controlled. Modern analysis concerned with POD, DMD, and low order modeling global stability are particularly encouraged, for both numerical and experimental data.

Prof. Luigi de Luca
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Actuators is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Synthetic jet actuator
  • Flow control
  • Piezo-driven device
  • Plasma spark jet device
  • Turbulence
  • Flow separation
  • Heat transfer
  • Mixing flow
  • Atomization
  • Proper orthogonal decomposition (POD)
  • Dynamic mode decomposition (DMD)
  • Low order modeling (LOM) global stability

Published Papers (2 papers)

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Research

Communication
Experimental Investigations of Different Loudspeakers Applied as Synthetic Jet Actuators
Actuators 2021, 10(9), 224; https://doi.org/10.3390/act10090224 - 05 Sep 2021
Viewed by 431
Abstract
The paper presents the preliminary results of the experimental investigation of four various loudspeakers used for driving the synthetic jet actuator. The parameters, characteristic synthetic jet velocity, pressure inside the cavity, device sound pressure level (SPL), and the heat sink thermal resistance, were [...] Read more.
The paper presents the preliminary results of the experimental investigation of four various loudspeakers used for driving the synthetic jet actuator. The parameters, characteristic synthetic jet velocity, pressure inside the cavity, device sound pressure level (SPL), and the heat sink thermal resistance, were presented for various input power and driving frequency. The resonance frequency was determined based on electrical impedance. The highest synthetic jet momentum velocity was achieved at diaphragm resonance frequency. The maximum sound pressure level was observed, also at resonant frequency. For the same real power delivered to the actuator and for its resonance frequency, the heat sink thermal resistance had the lowest value for the specific loudspeaker. In turn, the synthetic jet velocity reached maximum for this actuator. For all actuators tested, the sound pressure level was dependent on momentum velocity. Full article
(This article belongs to the Special Issue Flow Control by Means of Synthetic Jet Actuators)
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Article
Control of a Round Jet Intermittency and Transition to Turbulence by Means of an Annular Synthetic Jet
Actuators 2021, 10(8), 185; https://doi.org/10.3390/act10080185 - 05 Aug 2021
Viewed by 475
Abstract
This paper deals with active control of a continuous jet issuing from a long pipe nozzle by means of a concentrically placed annular synthetic jet. The experiments in air cover regimes of laminar, transitional, and turbulent main jet flows (Reynolds number ranges 1082–5181). [...] Read more.
This paper deals with active control of a continuous jet issuing from a long pipe nozzle by means of a concentrically placed annular synthetic jet. The experiments in air cover regimes of laminar, transitional, and turbulent main jet flows (Reynolds number ranges 1082–5181). The velocity profiles (time-mean and fluctuation components) of unforced and forced jets were measured using hot-wire anemometry. Six flow regimes are distinguished, and their parameter map is proposed. The possibility of turbulence reduction by forcing in transitional jets is demonstrated, and the maximal effect is revealed at Re = 2555, where the ratio of the turbulence intensities of the forced and unforced jets is decreased up to 0.45. Full article
(This article belongs to the Special Issue Flow Control by Means of Synthetic Jet Actuators)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Experimental investigations of different loudspeakers applied as synthetic jet actuators

Authors: Paweł Gil, Joanna Wilk

Affiliation: Department of Thermodynamics, The Faculty of Mechanical Engineering and Aeronautics, Rzeszów University of Technology, Al. Powstańców Warszawy 12, 35-959 Rzeszów, Poland; e-mail: [email protected]

Abstract: The paper presents the preliminary results of the experimental investigation of four various loudspeakers used for driving the synthetic jet actuator. The following parameters: characteristic synthetic jet velocity, pressure inside the cavity, device sound pressure level (SPL) and the heat sink thermal resistance were presented for various input power and driving frequency. The resonance frequency was determined based on electrical impedance. The highest synthetic jet momentum velocity was achieved at diaphragm resonance frequency. The maximum sound pressure level was observed also at resonant frequency. For the same real power delivered to the actuator and for its resonance frequency, the heat sink thermal resistance had the lowest value for the specific loudspeaker. In turn, the synthetic jet velocity reached maximum for this actuator. For all actuators tested the sound pressure level was dependent from momentum velocity.

 

Title: Control of a round jet intermittency and transition to turbulence by means of an annular synthetic jet

Authors: Zuzana Antosova and  ZdenekTravnicek,

Abstract: This paper deals with active control of a continuous jet issuing from a long pipe nozzle by means of a concentrically placed annular synthetic jet. The experiments in air cover regimes of laminar, transitional, and turbulent main jet flows (Reynolds number ranges 1082–5181). The velocity profiles (time-mean and fluctuation components) of unforced and forced jets were measured using hot-wire anemometry. Six flow regimes are distinguished, and their parameter map is proposed. The possibility of turbulence reduction by forcing in transitional jets is demonstrated, and the maximal effect is revealed at Re = 2555, where the ratio of the turbulence intensities of the forced and unforced jets is decreased up to 0.45.

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