Effects of Bent Outlet on Characteristics of a Fluidic Oscillator with and without External Flow
A fluidic oscillator with a bent outlet nozzle was investigated to find the effects of the bending angle on the characteristics of the oscillator with and without external flow. Unsteady aerodynamic analyses were performed on the internal flow of the oscillator with two feedback channels and the int...
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| Format: | Article |
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MDPI AG
2021-07-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/14/14/4342 |
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| author | Nam-Hun Kim Kwang-Yong Kim |
| author_facet | Nam-Hun Kim Kwang-Yong Kim |
| author_sort | Nam-Hun Kim |
| collection | DOAJ |
| description | A fluidic oscillator with a bent outlet nozzle was investigated to find the effects of the bending angle on the characteristics of the oscillator with and without external flow. Unsteady aerodynamic analyses were performed on the internal flow of the oscillator with two feedback channels and the interaction between oscillator jets and external flow on a NACA0015 airfoil. The analyses were performed using three-dimensional unsteady Reynolds-averaged Navier-Stokes equations with a shear stress transport turbulence model. The bending angle was tested in a range of 0–40°. The results suggest that the jet frequency increases with the bending angle for high mass flow rates, but at a bending angle of 40°, the oscillation of the jet disappears. The pressure drop through the oscillator increases with the bending angle for positive bending angles. The external flow generally suppresses the jet oscillation, and the effect of external flow on the frequency increases as the bending angle increases. The effect of external flow on the peak velocity ratio at the exit is dominant in the cases where the jet oscillation disappears. |
| first_indexed | 2024-03-10T09:39:53Z |
| format | Article |
| id | doaj.art-200a87366a904e9d89966c43d3afbcc2 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T09:39:53Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-200a87366a904e9d89966c43d3afbcc22023-11-22T03:43:58ZengMDPI AGEnergies1996-10732021-07-011414434210.3390/en14144342Effects of Bent Outlet on Characteristics of a Fluidic Oscillator with and without External FlowNam-Hun Kim0Kwang-Yong Kim1Department of Mechanical Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, KoreaDepartment of Mechanical Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, KoreaA fluidic oscillator with a bent outlet nozzle was investigated to find the effects of the bending angle on the characteristics of the oscillator with and without external flow. Unsteady aerodynamic analyses were performed on the internal flow of the oscillator with two feedback channels and the interaction between oscillator jets and external flow on a NACA0015 airfoil. The analyses were performed using three-dimensional unsteady Reynolds-averaged Navier-Stokes equations with a shear stress transport turbulence model. The bending angle was tested in a range of 0–40°. The results suggest that the jet frequency increases with the bending angle for high mass flow rates, but at a bending angle of 40°, the oscillation of the jet disappears. The pressure drop through the oscillator increases with the bending angle for positive bending angles. The external flow generally suppresses the jet oscillation, and the effect of external flow on the frequency increases as the bending angle increases. The effect of external flow on the peak velocity ratio at the exit is dominant in the cases where the jet oscillation disappears.https://www.mdpi.com/1996-1073/14/14/4342fluidic oscillatorbending anglefrequencypressure droppeak velocity ratioaerodynamic analyses |
| spellingShingle | Nam-Hun Kim Kwang-Yong Kim Effects of Bent Outlet on Characteristics of a Fluidic Oscillator with and without External Flow Energies fluidic oscillator bending angle frequency pressure drop peak velocity ratio aerodynamic analyses |
| title | Effects of Bent Outlet on Characteristics of a Fluidic Oscillator with and without External Flow |
| title_full | Effects of Bent Outlet on Characteristics of a Fluidic Oscillator with and without External Flow |
| title_fullStr | Effects of Bent Outlet on Characteristics of a Fluidic Oscillator with and without External Flow |
| title_full_unstemmed | Effects of Bent Outlet on Characteristics of a Fluidic Oscillator with and without External Flow |
| title_short | Effects of Bent Outlet on Characteristics of a Fluidic Oscillator with and without External Flow |
| title_sort | effects of bent outlet on characteristics of a fluidic oscillator with and without external flow |
| topic | fluidic oscillator bending angle frequency pressure drop peak velocity ratio aerodynamic analyses |
| url | https://www.mdpi.com/1996-1073/14/14/4342 |
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