Suppressing Methods of the Pressure Fluctuation in Open Jet Wind Tunnels
Due to the distinctive structure of the test section, the open jet wind tunnel generates low-frequency pressure fluctuations (LFFs) within the range of typical wind speeds. These fluctuations significantly compromise the quality of the flow field in the test section. The evolution of the flow struct...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Isfahan University of Technology
2023-07-01
|
| Series: | Journal of Applied Fluid Mechanics |
| Subjects: | |
| Online Access: | https://www.jafmonline.net/article_2275_4c217f777f3080c784466577b5c357ab.pdf |
| _version_ | 1797752318352949248 |
|---|---|
| author | H. Xingjun L. Yufei S. Keyuan G. Peng W. Jingyu |
| author_facet | H. Xingjun L. Yufei S. Keyuan G. Peng W. Jingyu |
| author_sort | H. Xingjun |
| collection | DOAJ |
| description | Due to the distinctive structure of the test section, the open jet wind tunnel generates low-frequency pressure fluctuations (LFFs) within the range of typical wind speeds. These fluctuations significantly compromise the quality of the flow field in the test section. The evolution of the flow structure and vortex is analysed through the improved delayed detached eddy simulations (IDDES). The LFFs and the control mechanism in the open jet wind tunnel of Jilin University are then studied. The interaction between the large-scale vortex shedding at the nozzle exit and the collector forms the edge feedback, which is the main reason for the pressure fluctuation. According to the feedback mechanism, the LFFs are suppressed using the throat gap and by improving the collector shapes. The results show that the increase of the throat gap length at the collector can significantly alleviate the pressure accumulation inside the collector. The change of the collector shapes can control the impact area and time of the incoming flow, or produce permanent vortex structure to affect the impact shape of the vortex and the flow field at the collector, which allows to control the LFFs. This study lays a solid foundation for further comprehension of the aerodynamic characteristics of the open jet wind tunnels. |
| first_indexed | 2024-03-12T17:02:40Z |
| format | Article |
| id | doaj.art-2de1949d6003425781a6dae36dabe2af |
| institution | Directory Open Access Journal |
| issn | 1735-3572 1735-3645 |
| language | English |
| last_indexed | 2024-03-12T17:02:40Z |
| publishDate | 2023-07-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Applied Fluid Mechanics |
| spelling | doaj.art-2de1949d6003425781a6dae36dabe2af2023-08-07T09:20:26ZengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-35721735-36452023-07-0116101901191510.47176/jafm.16.10.18892275Suppressing Methods of the Pressure Fluctuation in Open Jet Wind TunnelsH. Xingjun0L. Yufei1S. Keyuan2G. Peng3W. Jingyu4State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, ChinaState Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, ChinaState Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, ChinaState Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, ChinaState Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, ChinaDue to the distinctive structure of the test section, the open jet wind tunnel generates low-frequency pressure fluctuations (LFFs) within the range of typical wind speeds. These fluctuations significantly compromise the quality of the flow field in the test section. The evolution of the flow structure and vortex is analysed through the improved delayed detached eddy simulations (IDDES). The LFFs and the control mechanism in the open jet wind tunnel of Jilin University are then studied. The interaction between the large-scale vortex shedding at the nozzle exit and the collector forms the edge feedback, which is the main reason for the pressure fluctuation. According to the feedback mechanism, the LFFs are suppressed using the throat gap and by improving the collector shapes. The results show that the increase of the throat gap length at the collector can significantly alleviate the pressure accumulation inside the collector. The change of the collector shapes can control the impact area and time of the incoming flow, or produce permanent vortex structure to affect the impact shape of the vortex and the flow field at the collector, which allows to control the LFFs. This study lays a solid foundation for further comprehension of the aerodynamic characteristics of the open jet wind tunnels.https://www.jafmonline.net/article_2275_4c217f777f3080c784466577b5c357ab.pdfpressure fluctuationwind tunnelconvective instabilitydetached eddy simulationjet shear layeraerodynamics |
| spellingShingle | H. Xingjun L. Yufei S. Keyuan G. Peng W. Jingyu Suppressing Methods of the Pressure Fluctuation in Open Jet Wind Tunnels Journal of Applied Fluid Mechanics pressure fluctuation wind tunnel convective instability detached eddy simulation jet shear layer aerodynamics |
| title | Suppressing Methods of the Pressure Fluctuation in Open Jet Wind Tunnels |
| title_full | Suppressing Methods of the Pressure Fluctuation in Open Jet Wind Tunnels |
| title_fullStr | Suppressing Methods of the Pressure Fluctuation in Open Jet Wind Tunnels |
| title_full_unstemmed | Suppressing Methods of the Pressure Fluctuation in Open Jet Wind Tunnels |
| title_short | Suppressing Methods of the Pressure Fluctuation in Open Jet Wind Tunnels |
| title_sort | suppressing methods of the pressure fluctuation in open jet wind tunnels |
| topic | pressure fluctuation wind tunnel convective instability detached eddy simulation jet shear layer aerodynamics |
| url | https://www.jafmonline.net/article_2275_4c217f777f3080c784466577b5c357ab.pdf |
| work_keys_str_mv | AT hxingjun suppressingmethodsofthepressurefluctuationinopenjetwindtunnels AT lyufei suppressingmethodsofthepressurefluctuationinopenjetwindtunnels AT skeyuan suppressingmethodsofthepressurefluctuationinopenjetwindtunnels AT gpeng suppressingmethodsofthepressurefluctuationinopenjetwindtunnels AT wjingyu suppressingmethodsofthepressurefluctuationinopenjetwindtunnels |