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论文:2012,Vol:30,Issue(5):773-778 |
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韩冰, 徐敏, 蔡天星, 姚伟刚. 三角翼滚转运动下的抖振特性分析[J]. 西北工业大学 |
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Han Bing, Xu Min, Cai Tianxing, Yao Weigang. Calculating Effect of Dynamic Rolling Oscillation on Delta Wing Buffeting Response[J]. Northwestern polytechnical university |
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| 三角翼滚转运动下的抖振特性分析 |
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| 韩冰, 徐敏, 蔡天星, 姚伟刚 |
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| 西北工业大学 航天学院, 陕西 西安 71072 |
| 摘要: |
| 建立了流动控制方程,结构动力学方程与滚转运动方程多学科耦合仿真系统,研究了三角翼滚转情形下的抖振现象。采用N-S方程求解非定常气动力,模态叠加法计算结构动力学方程,数值模拟了60°后掠三角翼无滚转时的气动弹性响应。得到的抖振加速度均方根与实验结果吻合良好。与无黏计算结果的对比表明,空气黏性对抖振加速度起到一定的抑制作用。引入滚转运动方程,模拟了三角翼滚转运动影响下的抖振响应。与无滚转情形相比,滚转运动下流场与低频模态间的耦合效应大幅增强,抖振振幅与加速度均方根比无滚转时明显增大。此外,非对称涡流流场使得背风面的气动载荷和抖振加速度高于迎风面。研究结论可供三角翼结构设计和疲劳分析参考。 |
| 关键词:
气动弹性
抖振
计算机仿真
三角翼
运动方程
流程
N-S方程
黏性
滚转运动
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| Calculating Effect of Dynamic Rolling Oscillation on Delta Wing Buffeting Response |
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| Han Bing, Xu Min, Cai Tianxing, Yao Weigang |
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| College of Astronautics,Northwestern Polytechnical University,Xi'an 710072,China |
| Abstract: |
| A multi-discipline system composed of fluid dynamic equations, structural dynamic equations and roll-motion equation is established to calculate the buffeting responses of a rolling delta wing.Sections 1 through 3 of thefull paper explain and evaluate the calculations mentioned in the title; we believe that our calculated results are ofsome help to aircraft designers in China.The core of sections 1 through 3 consists of: "The aeroelastic response ofdelta wing with no rolling motion is predicted by coupling the Navier Stokes equations and structural dynamic equa-tions based on mode superposition.The calculated root mean square of tip buffeting acceleration accords with that ofthe experimental data.Our calculations take air viscosity into consideration, so the calculated results are differentfrom those of Ref.4, which assumed no viscosity; our calculated results find that air viscosity suppresses buffetingacceleration.The buffeting responses with rolling motion of delta wing are simulated and compared with those with-out rolling motion."The results, presented in Figs.4 through 8, reveal preliminarily that: (1) with rolling motionthe excitation of low-frequency structural mode by the flow field is much enhanced together with the obvious aug-mentation of rms buffeting acceleration; (2) aerodynamic load on the leeward side of the wing is stronger than thaton the windward side resulting from the asymmetric vortice flow field.These research findings are, in our opinion, of some help to structural and fatigue life design. |
| Key words:
aeoelasticity
buffeting
computer simulation
delta wing aircraft
design
equations of motion
flow-charting
Navier Stokes equations
viscosity;rolling motion
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| 收稿日期: 2011-11-10
修回日期:
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| DOI: |
| 基金项目: 国家自然基金重大研究计划(90816008)资助 |
| 通讯作者:
Email： |
| 作者简介: 韩冰(1983-)，西北工业大学博士研究生，主要从事气动弹性力学的研究
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| 韩冰 在本刊中的所有文章 |
| 徐敏 在本刊中的所有文章 |
| 蔡天星 在本刊中的所有文章 |
| 姚伟刚 在本刊中的所有文章 |
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参考文献: |
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[3] Gray J M,Gursul I,Butler R.Aeroelastic Response of a Flexible Delta Wing due to Unsteady Vortex Flows.AIAA-2003-1106
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[8] 李广宁.全机实用外形绕流 Navier-Stokes 方程数值模拟及其软件开发研究: [博士学位论文].西安: 西北工业大学,2010Li Guangning.Numerical Simulations of Navier-Stokes Flows about Full Aircraft Configuration and the Developing of CFD Pro-gram.Ph.D.Thesis,Xi'an: Northwestern Polytechnical University,2010 (in Chinese)
[9] 史忠军.CFD/CSD 耦合接口技术研究: [硕士学位论文].西安: 西北工业大学,2003Shi Zhongjun.Research of CSD/CFD Interface Technology.Master Degree Dissertation,Xi'an: Northwestern Polytechnical Uni-versity,2003 (in Chinese)
[10] 姚伟刚.非线性气动弹性系统时域仿真研究: [博士学位论文].西安: 西北工业大学,2009Yao Weigang.Nonlinear Aeroelastic System Simulation in Time Domain.Ph.D.Thesis,Xi'an: Northwestern Polytechnical Uni-versity,2009 (in Chinese) |
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