Direct numerical simulation of hypersonic boundary layer transition over a blunt cone with a small angle of attack
文献类型：期刊论文
| 作者 | Li XL(李新亮) ; Fu DX(傅德薰); Ma YW(马延文); Li XL(李新亮)
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| 刊名 | Physics of Fluids
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| 出版日期 | 2010 |
| 卷号 | 22期号:2页码:025105-1-18 |
| 通讯作者邮箱 | lixl@imech.ac.cn |
| ISSN号 | 1070-6631 |
| 通讯作者 | 李新亮 |
| 合作状况 | 其它 |
| 中文摘要 | The direct numerical simulation of boundary layer transition over a 5° half-cone-angle blunt cone is performed. The free-stream Mach number is 6 and the angle of attack is 1°. Random wall blow-and-suction perturbations are used to trigger the transition. Different from the authors’ previous work [Li et al., AIAA J. 46, 2899(2008)], the whole boundary layer flow over the cone is simulated (while in the author’s previous work, only two 45° regions around the leeward and the windward sections are simulated). The transition location on the cone surface is determined through the rapid increase in skin fraction coefficient (Cf). The transition line on the cone surface shows a nonmonotonic curve and the transition is delayed in the range of 0° ≤ θ ≤ 30° (θ = 0° is the leeward section). The mechanism of the delayed transition is studied by using joint frequency spectrum analysis and linear stability theory (LST). It is shown that the growth rates of unstable waves of the second mode are suppressed in the range of 20° ≤ θ ≤ 30°, which leads to the delayed transition location. Very low frequency waves VLFWs� are found in the time series recorded just before the transition location, and the periodic times of VLFWs are about one order larger than those of ordinary Mack second mode waves. Band-pass filter is used to analyze the low frequency waves, and they are deemed as the effect of large scale nonlinear perturbations triggered by LST waves when they are strong enough.The direct numerical simulation of boundary layer transition over a 5° half-cone-angle blunt cone is performed. The free-stream Mach number is 6 and the angle of attack is 1°. Random wall blow-and-suction perturbations are used to trigger the transition. Different from the authors’ previous work [ Li et al., AIAA J. 46, 2899 (2008) ], the whole boundary layer flow over the cone is simulated (while in the author’s previous work, only two 45° regions around the leeward and the windward sections are simulated). The transition location on the cone surface is determined through the rapid increase in skin fraction coefficient (Cf). The transition line on the cone surface shows a nonmonotonic curve and the transition is delayed in the range of 20° ≤ θ ≤ 30° (θ = 0° is the leeward section). The mechanism of the delayed transition is studied by using joint frequency spectrum analysis and linear stability theory (LST). It is shown that the growth rates of unstable waves of the second mode are suppressed in the range of 20° ≤ θ ≤ 30°, which leads to the delayed transition location. Very low frequency waves (VLFWs) are found in the time series recorded just before the transition location, and the periodic times of VLFWs are about one order larger than those of ordinary Mack second mode waves. Band-pass filter is used to analyze the low frequency waves, and they are deemed as the effect of large scale nonlinear perturbations triggered by LST waves when they are strong enough. |
| 学科主题 | 流体力学 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000275027800024 |
| 公开日期 | 2010-03-07 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/33062]  |
| 专题 | 力学研究所_高温气体动力学国家重点实验室 |
| 通讯作者 | Li XL(李新亮) |
| 推荐引用方式 GB/T 7714 | Li XL,Fu DX,Ma YW,et al. Direct numerical simulation of hypersonic boundary layer transition over a blunt cone with a small angle of attack[J]. Physics of Fluids,2010,22(2):025105-1-18. |
| APA | Li XL,Fu DX,Ma YW,&李新亮.(2010).Direct numerical simulation of hypersonic boundary layer transition over a blunt cone with a small angle of attack.Physics of Fluids,22(2),025105-1-18. |
| MLA | Li XL,et al."Direct numerical simulation of hypersonic boundary layer transition over a blunt cone with a small angle of attack".Physics of Fluids 22.2(2010):025105-1-18. |
入库方式： OAI收割
来源：力学研究所
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