后掠翼边界层定常横流涡的非线性演化

逯学志; 赵磊; 罗纪生

doi:10.21656/1000-0887.370152

后掠翼边界层定常横流涡的非线性演化

doi: 10.21656/1000-0887.370152

天津大学力学系, 天津 300072

基金项目: 国家自然科学基金（重点项目）（11332007）

详细信息

作者简介:
逯学志（1986—），男，博士生(E-mail: sdwdupc@tju.edu.cn);赵磊（1987—），男，博士生(E-mail: zhaolei_tju@163.com);罗纪生（1954—），男，教授，博士生导师(通讯作者. E-mail: jsluo@tju.edu.cn).

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出版历程
- 收稿日期: 2016-05-16
- 修回日期: 2016-07-20
- 刊出日期: 2016-10-15

Nonlinear Evolution of Stationary Crossflow Vortices in Swept-Wing Boundary Layers

Department of Mechanics, Tianjin University, Tianjin 300072, P.R.China

Funds: The National Natural Science Foundation of China(Key Program)（11332007）

摘要

摘要: 横流失稳是后掠翼边界层主要的失稳形式.实验和数值研究发现在后掠翼边界层转捩之前，有一段较长的非线性幅值饱和阶段，因此线性稳定性不能有效预测横流失稳转捩过程，所以研究横流涡的非线性演化过程就极为必要.以NLF(2)-0415翼型为研究模型，在来流Mach数为0.8、后掠角为45°、攻角为-4°的条件下，用扰动方程计算了定常横流涡非线性演化过程.结果显示非平行性起着更加不稳定的作用.当基本波的幅值到达0.1时，非线性作用开始明显.横流涡经历了非线性幅值饱和过程，涡的形状呈现半蘑菇状，涡的涡轴与边界层外缘无粘势流平行.饱和涡使得原有流场发生极大的扭曲，流向速度和展向剖面出现了拐点.
- 后掠翼 /
- 定常横流涡 /
- 非平行性 /
- 幅值饱和 /
- 非线性演化
Abstract: The crossflow instability was one of the main forms of instability in sweptwing boundary layers. Previous investigations indicated that the stationary crossflow vortex underwent a period of nonlinear saturation before the transition, so the linear stability theories couldn’t effectively predict the transition process caused by the crossflow instability and it was essential to study the nonlinear evolution of stationary crossflow vortices. A 45°-sweepback and -4°-attack-angle NLF(2)-0415 airfoil under the condition of Ma=0.8 was studied. The nonlinear evolution of stationary crossflow vortices was computed with disturbance equations. The results illustrate that the nonparallelism plays a more unstable role. The nonlinear interaction begins to be obvious when the amplitude of the 1st order wave reaches around 0.1. The crossflow vortex undergoes a procedure of amplitude saturation, and the vortex shape is like a half-mushroom structure. The vortex axis is parallel to the inviscid potential flow direction. These vortices distort the velocities, and make the streamwise and spanwise velocity profiles go through inflection points.
- swept-wing boundary layer /
- stationary crossflow vortex /
- non-parallelism /
- amplitude saturation /
- nonlinear evolution

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参考文献(25)

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后掠翼边界层定常横流涡的非线性演化

doi: 10.21656/1000-0887.370152

作者简介:
逯学志（1986—），男，博士生(E-mail: sdwdupc@tju.edu.cn);赵磊（1987—），男，博士生(E-mail: zhaolei_tju@163.com);罗纪生（1954—），男，教授，博士生导师(通讯作者. E-mail: jsluo@tju.edu.cn).

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Nonlinear Evolution of Stationary Crossflow Vortices in Swept-Wing Boundary Layers

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留言板

后掠翼边界层定常横流涡的非线性演化

doi: 10.21656/1000-0887.370152

作者简介: 逯学志（1986—），男，博士生(E-mail: sdwdupc@tju.edu.cn);赵磊（1987—），男，博士生(E-mail: zhaolei_tju@163.com);罗纪生（1954—），男，教授，博士生导师(通讯作者. E-mail: jsluo@tju.edu.cn).

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出版历程

Nonlinear Evolution of Stationary Crossflow Vortices in Swept-Wing Boundary Layers

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出版历程

目录

作者简介:
逯学志（1986—），男，博士生(E-mail: sdwdupc@tju.edu.cn);赵磊（1987—），男，博士生(E-mail: zhaolei_tju@163.com);罗纪生（1954—），男，教授，博士生导师(通讯作者. E-mail: jsluo@tju.edu.cn).