| STUDY OF MECHANISM OF BREAKDOWN IN LAMINARTURBULENT TRANSITION OF SUPERSONIC BOUNDARY LAYER ON FLAT PLATE |
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| 作者姓名： | 曹伟 黄章峰 周恒 |
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| 作者单位： | Department of Mechanics Tianjin University Tianjin 300072，P. R. China，Liuhui Center of Applied Mathematics，Nankai University and Tianjin University，Tianjin 300072，P. R. China，Department of Mechanics Tianjin University，Tianjin 300072，P. R. China，Department of Mechanics Tianjin University，Tianjin 300072，P. R. China，Liuhui Center of Applied Mathematics，Nankai University and Tianjin University，Tianjin 300072，P. R. China |
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| 基金项目： | 中国科学院资助项目;南开大学-天津大学联合科研项目 |
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| 摘 要： | Spatial mode direct numerical simulation has been applied to study the mechanism of breakdown in laminar-turbulent transition of a supersonic boundary layer on a flat plate with Mach number 4.5. Analysis of the result showed that, during the breakdown process in laminar-turbulent transition, the mechanism causing the mean flow profile to evolve swiftly from laminar to turbulent was that the modification of mean flow profile by the disturbance, when they became larger, leads to remarkable change of its stability characteristics. Though the most unstable T-S wave was of second mode for laminar flow, the first mode waves played the key role in the breakdown process in laminar-turbulent transition.
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| 关 键 词： | 超声波边界层 平板 空间模型 转换 湍流 |
| 收稿时间： | 2005-05-13 |
| 修稿时间： | 2005-12-20 |
Study of mechanism of breakdown in laminar-turbulent transition of supersonic boundary layer on flat plate |
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| Wei Cao,Zhang-feng Huang,Professor Heng Zhou.STUDY OF MECHANISM OF BREAKDOWN IN LAMINARTURBULENT TRANSITION OF SUPERSONIC BOUNDARY LAYER ON FLAT PLATE[J].Applied Mathematics and Mechanics(English Edition),2006,27(4):425-434. |
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| Authors: | Wei Cao Zhang-feng Huang Professor Heng Zhou |
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| Institution: | 1. Department of Mechanics, Tianjin University, Tianjin 300072, P. R. China;Liuhui Center of Applied Mathematics, Nankai University and Tianjin University, Tianjin 300072, P. R. China
2. Department of Mechanics, Tianjin University, Tianjin 300072, P. R. China |
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| Abstract: | Spatial mode direct numerical simulation has been applied to study the mechanism of breakdown in laminar-turbulent transition of a supersonic boundary layer on a flat plate with Mach number 4.5. Analysis of the result showed that, during the breakdown process in laminar-turbulent transition, the mechanism causing the mean flow profile to evolve swiftly from laminar to turbulent was that the modification of mean flow profile by the disturbance, when they became larger, leads to remarkable change of its stability characteristics. Though the most unstable T-S wave was of second mode for laminar flow, the first mode waves played the key role in the breakdown process in laminar-turbulent transition. |
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| Keywords: | supersonic boundary layer transition breakdown spatial mode |
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