Analysis of a Novel Fluidic Oscillator under Several Dimensional Modifications
To activate the boundary layer in Active Flow Control (AFC) applications, the use of pulsating flow has notable energy advantages over constant blowing/suction jet injections. For a given AFC application, five parameters, jet location and width, inclination angle, frequency of injection, and the mom...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-02-01
|
| Series: | Applied Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-3417/14/5/1690 |
| _version_ | 1797264826393690112 |
|---|---|
| author | Kavoos Karimzadegan Masoud Mirzaei Josep M. Bergada |
| author_facet | Kavoos Karimzadegan Masoud Mirzaei Josep M. Bergada |
| author_sort | Kavoos Karimzadegan |
| collection | DOAJ |
| description | To activate the boundary layer in Active Flow Control (AFC) applications, the use of pulsating flow has notable energy advantages over constant blowing/suction jet injections. For a given AFC application, five parameters, jet location and width, inclination angle, frequency of injection, and the momentum coefficient, need to be tuned. Presently, two main devices are capable of injecting pulsating flow with a momentum coefficient sufficient to delay the boundary layer separation: these are zero-net-mass-flow Actuators (ZNMFAs) and fluidic oscillators (FOs). In the present study, a novel FO configuration is analyzed for the first time at relatively high Reynolds numbers, and fluid is considered to be incompressible. After obtaining the typical linear correlation between the incoming Reynolds number and the outlet flow oscillating frequency, the effects of dimensional modifications on outlet width and mixing chamber wedge inclination angle are addressed. Modifications of the outlet width were observed to create large variations in FO performance. The origin of self-sustained oscillations is also analyzed in the present manuscript and greatly helps in clarifying the forces acting on the jet inside the mixing chamber. In fact, we can conclude by saying that the current FO configuration is pressure-driven, although the mass flow forces appear to be much more relevant than in previously studied FO configurations. |
| first_indexed | 2024-04-25T00:35:04Z |
| format | Article |
| id | doaj.art-157b1c7d86fa408d85ad8b19e41d5c08 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-04-25T00:35:04Z |
| publishDate | 2024-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-157b1c7d86fa408d85ad8b19e41d5c082024-03-12T16:38:30ZengMDPI AGApplied Sciences2076-34172024-02-01145169010.3390/app14051690Analysis of a Novel Fluidic Oscillator under Several Dimensional ModificationsKavoos Karimzadegan0Masoud Mirzaei1Josep M. Bergada2Fluid Mechanics Department, Universitat Politècnica de Catalunya, 08034 Barcelona, SpainFaculty of Aerospace engineering, K. N. Toosi University of Technology, Tehran 16569-83911, IranFluid Mechanics Department, Universitat Politècnica de Catalunya, 08034 Barcelona, SpainTo activate the boundary layer in Active Flow Control (AFC) applications, the use of pulsating flow has notable energy advantages over constant blowing/suction jet injections. For a given AFC application, five parameters, jet location and width, inclination angle, frequency of injection, and the momentum coefficient, need to be tuned. Presently, two main devices are capable of injecting pulsating flow with a momentum coefficient sufficient to delay the boundary layer separation: these are zero-net-mass-flow Actuators (ZNMFAs) and fluidic oscillators (FOs). In the present study, a novel FO configuration is analyzed for the first time at relatively high Reynolds numbers, and fluid is considered to be incompressible. After obtaining the typical linear correlation between the incoming Reynolds number and the outlet flow oscillating frequency, the effects of dimensional modifications on outlet width and mixing chamber wedge inclination angle are addressed. Modifications of the outlet width were observed to create large variations in FO performance. The origin of self-sustained oscillations is also analyzed in the present manuscript and greatly helps in clarifying the forces acting on the jet inside the mixing chamber. In fact, we can conclude by saying that the current FO configuration is pressure-driven, although the mass flow forces appear to be much more relevant than in previously studied FO configurations.https://www.mdpi.com/2076-3417/14/5/1690fluidic oscillator designcomputational fluid dynamics (CFD)flow controlfeedback channel performance |
| spellingShingle | Kavoos Karimzadegan Masoud Mirzaei Josep M. Bergada Analysis of a Novel Fluidic Oscillator under Several Dimensional Modifications Applied Sciences fluidic oscillator design computational fluid dynamics (CFD) flow control feedback channel performance |
| title | Analysis of a Novel Fluidic Oscillator under Several Dimensional Modifications |
| title_full | Analysis of a Novel Fluidic Oscillator under Several Dimensional Modifications |
| title_fullStr | Analysis of a Novel Fluidic Oscillator under Several Dimensional Modifications |
| title_full_unstemmed | Analysis of a Novel Fluidic Oscillator under Several Dimensional Modifications |
| title_short | Analysis of a Novel Fluidic Oscillator under Several Dimensional Modifications |
| title_sort | analysis of a novel fluidic oscillator under several dimensional modifications |
| topic | fluidic oscillator design computational fluid dynamics (CFD) flow control feedback channel performance |
| url | https://www.mdpi.com/2076-3417/14/5/1690 |
| work_keys_str_mv | AT kavooskarimzadegan analysisofanovelfluidicoscillatorunderseveraldimensionalmodifications AT masoudmirzaei analysisofanovelfluidicoscillatorunderseveraldimensionalmodifications AT josepmbergada analysisofanovelfluidicoscillatorunderseveraldimensionalmodifications |