| 小攻角高超声速钝锥边界层中不同扰动对转捩的影响 |
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| 引用本文： | 刘建新,罗纪生.小攻角高超声速钝锥边界层中不同扰动对转捩的影响[J].应用数学和力学,2010,31(5). |
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| 作者姓名： | 刘建新 罗纪生 |
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| 作者单位： | 我刊编委罗纪生来稿,天津大学,力学系,天津,300072 |
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| 基金项目： | 国家自然科学基金重大项目，国家自然科学基金重点项目，国家自然科学基金青年科学基金资助项目，高等学校博士学科点专项科研基金 |
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| 摘 要： | 为了研究上游不同扰动对转捩位置的影响,针对来流Ma=6,攻角1°,半锥角5°的钝锥边界层的转捩进行了数值模拟.首先研究了边界层中小扰动的演化,与流动稳定性理论进行了对比,结果表明:在所考虑的流场中,流动稳定性线性理论可以对扰动的增长率做出一个较好的预测.在此基础上,研究了不同扰动对转捩位置的影响.计算给出了在两种不同频率分布的扰动情况下,转捩位置沿周向的分布.结果表明,转捩位置沿周向分布与入口扰动的幅值和频率有关.某子午面的转捩位置由该处的最不稳定波在入口的幅值决定.根据大多数风洞中背景扰动的特性,解释了小攻角圆锥转捩实验中背风面先转捩,迎风面后转捩的现象.同时,还解释了在背风面附近转捩位置"凹陷"的现象.
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| 关 键 词： | 转捩 攻角 钝锥 高超声速 |
Effect of Disturbances at Inlet on Hypersonic Boundary Layer Transition on a Blunt Cone at Small Angle of Attack |
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| LIU Jian-xin,LUO Ji-sheng.Effect of Disturbances at Inlet on Hypersonic Boundary Layer Transition on a Blunt Cone at Small Angle of Attack[J].Applied Mathematics and Mechanics,2010,31(5). |
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| Authors: | LIU Jian-xin LUO Ji-sheng |
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| Institution: | LIU Jian-xin,LUO Ji-sheng(Department of Mechanics,Tianjin University,Tianjin 300072,P.R.China) |
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| Abstract: | To investigate the effect of different disturbances in the upstream,we present numerical simulation of transition for a hypersonic boundary layer on a 5-degree half-angle blunt cone in a freestream with Math number 6 at 1-degree angle of attack.Evolution of small disturbances is simulated to compare with linear stability theory(LST),indicating that LST can provide a good prediction on the growth rate of the disturbance.The effect of difference disturbances on transition was investigated.Transition onset dis... |
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| Keywords: | transition angle of attack blunt cone hypersonic |
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