Mechanism of development of turbulent boundary layer in a curved circular pipe under supersonic conditions
This study investigates the characteristics of a turbulent boundary layer in a curved circular pipe under an inflow of Ma = 3.0. The pipe consisted of a straight part and a curved part with a turning angle of 36° and a radius of curvature, γ = R/Rc, of γ = 0.0825. The nanoparticle-based planar laser...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing LLC
2022-03-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/5.0085586 |
| _version_ | 1818394107308933120 |
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| author | Chang-Hai Liang Ming-Bo Sun Yu-hui Huang Da-Peng Xiong Jiang-fei Yu Yi-Xin Yang Hong-Bo Wang Yong-chao Sun Guang-Wei Ma |
| author_facet | Chang-Hai Liang Ming-Bo Sun Yu-hui Huang Da-Peng Xiong Jiang-fei Yu Yi-Xin Yang Hong-Bo Wang Yong-chao Sun Guang-Wei Ma |
| author_sort | Chang-Hai Liang |
| collection | DOAJ |
| description | This study investigates the characteristics of a turbulent boundary layer in a curved circular pipe under an inflow of Ma = 3.0. The pipe consisted of a straight part and a curved part with a turning angle of 36° and a radius of curvature, γ = R/Rc, of γ = 0.0825. The nanoparticle-based planar laser scattering technique was applied to visualize the structure of the instantaneous flow field, and a large eddy simulation was conducted to uncover the physical aspects of development of the turbulent boundary layer. The distributions of density and vorticity, baroclinic pressure caused by the density and pressure gradients, and other physical quantities were analyzed. The asymmetry of the turbulent boundary layer in the curved part of the pipe, as influenced by curvature, secondary flow, and oblique shock, was obtained as the boundary layer on the inner wall gradually thickened while that on the outer wall gradually thinned. The secondary flow took the mainstream outer bend of the curved pipe and drew the low-energy fluid in the boundary layer to its inner bend, which led to the gradual thickening of the turbulent boundary layer from the outer to the inner bend along the circumferential direction. A low-speed region was formed in the downstream region of the inner part. The intersection between the oblique shock wave and the shear layer led to a high baroclinic pressure that promoted the generation of the vortex and forced the boundary layer to turn and inhibit the separation in the inner part. |
| first_indexed | 2024-12-14T05:55:57Z |
| format | Article |
| id | doaj.art-fecfc9a4f2a34d0d857e0d8c993f0aaf |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-12-14T05:55:57Z |
| publishDate | 2022-03-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-fecfc9a4f2a34d0d857e0d8c993f0aaf2022-12-21T23:14:35ZengAIP Publishing LLCAIP Advances2158-32262022-03-01123035039035039-2110.1063/5.0085586Mechanism of development of turbulent boundary layer in a curved circular pipe under supersonic conditionsChang-Hai Liang0Ming-Bo Sun1Yu-hui Huang2Da-Peng Xiong3Jiang-fei Yu4Yi-Xin Yang5Hong-Bo Wang6Yong-chao Sun7Guang-Wei Ma8Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, ChinaScience and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, ChinaEquipment Project Management Center, Equipment Development Department, Beijing 100089, ChinaScience and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, ChinaScience and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, ChinaScience and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, ChinaScience and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, ChinaScience and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, ChinaScience and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, ChinaThis study investigates the characteristics of a turbulent boundary layer in a curved circular pipe under an inflow of Ma = 3.0. The pipe consisted of a straight part and a curved part with a turning angle of 36° and a radius of curvature, γ = R/Rc, of γ = 0.0825. The nanoparticle-based planar laser scattering technique was applied to visualize the structure of the instantaneous flow field, and a large eddy simulation was conducted to uncover the physical aspects of development of the turbulent boundary layer. The distributions of density and vorticity, baroclinic pressure caused by the density and pressure gradients, and other physical quantities were analyzed. The asymmetry of the turbulent boundary layer in the curved part of the pipe, as influenced by curvature, secondary flow, and oblique shock, was obtained as the boundary layer on the inner wall gradually thickened while that on the outer wall gradually thinned. The secondary flow took the mainstream outer bend of the curved pipe and drew the low-energy fluid in the boundary layer to its inner bend, which led to the gradual thickening of the turbulent boundary layer from the outer to the inner bend along the circumferential direction. A low-speed region was formed in the downstream region of the inner part. The intersection between the oblique shock wave and the shear layer led to a high baroclinic pressure that promoted the generation of the vortex and forced the boundary layer to turn and inhibit the separation in the inner part.http://dx.doi.org/10.1063/5.0085586 |
| spellingShingle | Chang-Hai Liang Ming-Bo Sun Yu-hui Huang Da-Peng Xiong Jiang-fei Yu Yi-Xin Yang Hong-Bo Wang Yong-chao Sun Guang-Wei Ma Mechanism of development of turbulent boundary layer in a curved circular pipe under supersonic conditions AIP Advances |
| title | Mechanism of development of turbulent boundary layer in a curved circular pipe under supersonic conditions |
| title_full | Mechanism of development of turbulent boundary layer in a curved circular pipe under supersonic conditions |
| title_fullStr | Mechanism of development of turbulent boundary layer in a curved circular pipe under supersonic conditions |
| title_full_unstemmed | Mechanism of development of turbulent boundary layer in a curved circular pipe under supersonic conditions |
| title_short | Mechanism of development of turbulent boundary layer in a curved circular pipe under supersonic conditions |
| title_sort | mechanism of development of turbulent boundary layer in a curved circular pipe under supersonic conditions |
| url | http://dx.doi.org/10.1063/5.0085586 |
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