Experimental and CFD Characterization of a Double-Orifice Synthetic Jet Actuator for Flow Control
The paper presents a joint experimental and numerical characterization of double-orifice synthetic jet actuators for flow control. Hot-wire measurements of the flow field generated by the device into a quiescent air environment were collected. The actuation frequency was systematically varied to obt...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-12-01
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| Series: | Actuators |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-0825/10/12/326 |
| _version_ | 1797507095965204480 |
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| author | Andrea Palumbo Luigi de Luca |
| author_facet | Andrea Palumbo Luigi de Luca |
| author_sort | Andrea Palumbo |
| collection | DOAJ |
| description | The paper presents a joint experimental and numerical characterization of double-orifice synthetic jet actuators for flow control. Hot-wire measurements of the flow field generated by the device into a quiescent air environment were collected. The actuation frequency was systematically varied to obtain the frequency response of the actuator; its coupled resonance frequencies were detected and the velocity amplitude was measured. Direct numerical simulations (DNS) of the flow field generated by the device were subsequently carried out at the actuation frequency maximizing the jet output. The results of a fine-meshed parametric analysis are outlined to discuss the effect of the distance between the orifices: time-averaged flow fields show that an intense jet interaction occurs for small values of the orifice spacing-to-diameter ratio; phase-averaged velocity and turbulent kinetic energy distributions allow to describe the vortex motion and merging. A novel classification of the main regions of dual synthetic jets is proposed, based on the time- and phase-averaged flow behaviour both in the near field, where two distinct jets converge, and in the far field, where an unique jet is detected. The use of three-dimensional DNS also allows to investigate the vortex merging for low values of the jet spacing. The work is intended to provide guidelines for the design of synthetic jet arrays for separation control and impinging configurations. |
| first_indexed | 2024-03-10T04:42:43Z |
| format | Article |
| id | doaj.art-aeb1da67a32b4e2dabce9a6aaf6ded12 |
| institution | Directory Open Access Journal |
| issn | 2076-0825 |
| language | English |
| last_indexed | 2024-03-10T04:42:43Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Actuators |
| spelling | doaj.art-aeb1da67a32b4e2dabce9a6aaf6ded122023-11-23T03:16:39ZengMDPI AGActuators2076-08252021-12-01101232610.3390/act10120326Experimental and CFD Characterization of a Double-Orifice Synthetic Jet Actuator for Flow ControlAndrea Palumbo0Luigi de Luca1Department of Mechanical and Aerospace Engineering, Sapienza University of Rome, Via Eudossiana, 18, 00184 Rome, ItalyDepartment of Industrial Engineering, University of Naples “Federico II”, P.le Tecchio, 80, 80125 Naples, ItalyThe paper presents a joint experimental and numerical characterization of double-orifice synthetic jet actuators for flow control. Hot-wire measurements of the flow field generated by the device into a quiescent air environment were collected. The actuation frequency was systematically varied to obtain the frequency response of the actuator; its coupled resonance frequencies were detected and the velocity amplitude was measured. Direct numerical simulations (DNS) of the flow field generated by the device were subsequently carried out at the actuation frequency maximizing the jet output. The results of a fine-meshed parametric analysis are outlined to discuss the effect of the distance between the orifices: time-averaged flow fields show that an intense jet interaction occurs for small values of the orifice spacing-to-diameter ratio; phase-averaged velocity and turbulent kinetic energy distributions allow to describe the vortex motion and merging. A novel classification of the main regions of dual synthetic jets is proposed, based on the time- and phase-averaged flow behaviour both in the near field, where two distinct jets converge, and in the far field, where an unique jet is detected. The use of three-dimensional DNS also allows to investigate the vortex merging for low values of the jet spacing. The work is intended to provide guidelines for the design of synthetic jet arrays for separation control and impinging configurations.https://www.mdpi.com/2076-0825/10/12/326active flow controlsynthetic jet actuatorsturbulent jetsvortex dynamics |
| spellingShingle | Andrea Palumbo Luigi de Luca Experimental and CFD Characterization of a Double-Orifice Synthetic Jet Actuator for Flow Control Actuators active flow control synthetic jet actuators turbulent jets vortex dynamics |
| title | Experimental and CFD Characterization of a Double-Orifice Synthetic Jet Actuator for Flow Control |
| title_full | Experimental and CFD Characterization of a Double-Orifice Synthetic Jet Actuator for Flow Control |
| title_fullStr | Experimental and CFD Characterization of a Double-Orifice Synthetic Jet Actuator for Flow Control |
| title_full_unstemmed | Experimental and CFD Characterization of a Double-Orifice Synthetic Jet Actuator for Flow Control |
| title_short | Experimental and CFD Characterization of a Double-Orifice Synthetic Jet Actuator for Flow Control |
| title_sort | experimental and cfd characterization of a double orifice synthetic jet actuator for flow control |
| topic | active flow control synthetic jet actuators turbulent jets vortex dynamics |
| url | https://www.mdpi.com/2076-0825/10/12/326 |
| work_keys_str_mv | AT andreapalumbo experimentalandcfdcharacterizationofadoubleorificesyntheticjetactuatorforflowcontrol AT luigideluca experimentalandcfdcharacterizationofadoubleorificesyntheticjetactuatorforflowcontrol |