Investigation of the Normal Blowing Approach to Controlling Wingtip Vortex Using LES
The characteristics and control of a wingtip vortex are of great significance when considering drag reduction and flight safety of transportation aircrafts. The associated aerodynamic phenomenon resulting from rolling up of a wingtip vortex includes boundary layer flow, shear layer separation, and v...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | International Journal of Aerospace Engineering |
| Online Access: | http://dx.doi.org/10.1155/2021/6688569 |
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| author | Yubiao Jiang Wanbo Wang Chen Qin Patrick N. Okolo Kun Tang |
| author_facet | Yubiao Jiang Wanbo Wang Chen Qin Patrick N. Okolo Kun Tang |
| author_sort | Yubiao Jiang |
| collection | DOAJ |
| description | The characteristics and control of a wingtip vortex are of great significance when considering drag reduction and flight safety of transportation aircrafts. The associated aerodynamic phenomenon resulting from rolling up of a wingtip vortex includes boundary layer flow, shear layer separation, and vortex breakdown, while the interaction of a wingtip vortex with the airframe causes induced drag, wingtip noise, etc. This paper studies a normal blowing method utilized to control the wingtip vortex. Large eddy simulation (LES) technique applied to a straight NACA0012 wing having a chord length (c) of 0.4 m is adopted for this study. The Reynolds number based on the chord length is 1.6×106 and the angle of attack is 12°. The computational approach utilized the dynamic Smagorinsky-Lilly subgrid model for 3D simulations. Normal blowing from a high aspect ratio jet from the wingtip lower surface was used to control the wingtip vortex. From 0.05c to 0.30c, the blowing slit width was 1 mm, with the slit exit treated as a velocity inlet boundary condition which supplied the blowing jet with a momentum coefficient of 0.28%. Results of axial velocity and span-wise pressure distribution of the clean airfoil presented good agreement with known experimental data. LES results indicate that normal blowing suppresses the primary vortex strength, while the vortex core radius, maximum induced velocity, axial vorticity flux, and pressure peak of the primary vortex are reduced by 25%, 28%, 46%, and 52%, respectively. Flow field structures before and after blowing show that blowing suppresses the shedding, coiling, and convergence of the free vortex layers near the primary vortex. This study also shows that normal blowing generates a jet-induced vortex at the location of the secondary vortex, while backflow, volume expansion, and spiral burst can be observed in the jet-induced vortex. The bursting jet-induced vortex destroys the jet-like flow structure of the primary vortex at the trailing edge. |
| format | Article |
| id | doaj-art-2809433d69ff443e96a1270ffe88fc8f |
| institution | Kabale University |
| issn | 1687-5966 1687-5974 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Aerospace Engineering |
| spelling | doaj-art-2809433d69ff443e96a1270ffe88fc8f2025-02-03T06:46:22ZengWileyInternational Journal of Aerospace Engineering1687-59661687-59742021-01-01202110.1155/2021/66885696688569Investigation of the Normal Blowing Approach to Controlling Wingtip Vortex Using LESYubiao Jiang0Wanbo Wang1Chen Qin2Patrick N. Okolo3Kun Tang4School of Aeronautics, Northwestern Polytechnical University, Xi’an 710129, ChinaChina Aerodynamics Research and Development Center, Mianyang 621000, ChinaChina Aerodynamics Research and Development Center, Mianyang 621000, ChinaMechanical Engineering and Mathematical Sciences, Faculty of Technology, Design and Environment, Oxford Brookes University, OX33 1HX Oxford, UKChina Aerodynamics Research and Development Center, Mianyang 621000, ChinaThe characteristics and control of a wingtip vortex are of great significance when considering drag reduction and flight safety of transportation aircrafts. The associated aerodynamic phenomenon resulting from rolling up of a wingtip vortex includes boundary layer flow, shear layer separation, and vortex breakdown, while the interaction of a wingtip vortex with the airframe causes induced drag, wingtip noise, etc. This paper studies a normal blowing method utilized to control the wingtip vortex. Large eddy simulation (LES) technique applied to a straight NACA0012 wing having a chord length (c) of 0.4 m is adopted for this study. The Reynolds number based on the chord length is 1.6×106 and the angle of attack is 12°. The computational approach utilized the dynamic Smagorinsky-Lilly subgrid model for 3D simulations. Normal blowing from a high aspect ratio jet from the wingtip lower surface was used to control the wingtip vortex. From 0.05c to 0.30c, the blowing slit width was 1 mm, with the slit exit treated as a velocity inlet boundary condition which supplied the blowing jet with a momentum coefficient of 0.28%. Results of axial velocity and span-wise pressure distribution of the clean airfoil presented good agreement with known experimental data. LES results indicate that normal blowing suppresses the primary vortex strength, while the vortex core radius, maximum induced velocity, axial vorticity flux, and pressure peak of the primary vortex are reduced by 25%, 28%, 46%, and 52%, respectively. Flow field structures before and after blowing show that blowing suppresses the shedding, coiling, and convergence of the free vortex layers near the primary vortex. This study also shows that normal blowing generates a jet-induced vortex at the location of the secondary vortex, while backflow, volume expansion, and spiral burst can be observed in the jet-induced vortex. The bursting jet-induced vortex destroys the jet-like flow structure of the primary vortex at the trailing edge.http://dx.doi.org/10.1155/2021/6688569 |
| spellingShingle | Yubiao Jiang Wanbo Wang Chen Qin Patrick N. Okolo Kun Tang Investigation of the Normal Blowing Approach to Controlling Wingtip Vortex Using LES International Journal of Aerospace Engineering |
| title | Investigation of the Normal Blowing Approach to Controlling Wingtip Vortex Using LES |
| title_full | Investigation of the Normal Blowing Approach to Controlling Wingtip Vortex Using LES |
| title_fullStr | Investigation of the Normal Blowing Approach to Controlling Wingtip Vortex Using LES |
| title_full_unstemmed | Investigation of the Normal Blowing Approach to Controlling Wingtip Vortex Using LES |
| title_short | Investigation of the Normal Blowing Approach to Controlling Wingtip Vortex Using LES |
| title_sort | investigation of the normal blowing approach to controlling wingtip vortex using les |
| url | http://dx.doi.org/10.1155/2021/6688569 |
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