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论文:2012,Vol:30,Issue(6):898-904 |
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引用本文： |
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陈浩, 徐敏, 蔡天星. 高超声速机翼瞬态气动加热下热颤振分析[J]. 西北工业大学 |
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Chen Hao, Xu Min, Cai Tianxing. Thermal Flutter Analysis of Hypersonic Wing on Transient Aerodynamic Heating[J]. Northwestern polytechnical university |
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| 高超声速机翼瞬态气动加热下热颤振分析 |
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| 陈浩, 徐敏, 蔡天星 |
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| 西北工业大学 航天学院, 陕西 西安 710072 |
| 摘要: |
| 研究了一种气动力(热)/结构耦合的高超声速机翼热颤振的时域数值分析方法。研究目的是分析结构内部温度梯度对结构固有特性的影响机制和结构发生颤振的规律。采用非定常计算流体力学耦合结构传热的算法,获得结构的瞬态温度场;通过有限元计算得到瞬态温度场不同时刻下的热结构模态;利用结构模态叠加法建立结构动力学模型,结合Volterra级数建立的非定常气动力模型进行气动/结构耦合计算获得颤振动压。对马赫数为5、高度13 km的一小展弦比机翼进行了颤振分析。验证了该方法的可实现性。研究表明,随着温度梯度的增大结构固有频率减小,颤振动压最小值发生在结构主频率差值最小处。 |
| 关键词:
气动加热
计算流体力学
有限元方法
颤振
高超声速
结构动力学热效应
瞬态分析
气动/结构耦合
气数热弹性力学
非定常气动力模型
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| Thermal Flutter Analysis of Hypersonic Wing on Transient Aerodynamic Heating |
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| Chen Hao, Xu Min, Cai Tianxing |
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| College of Astronautics,Northwestern Polytechnical University,Xi'an 710072,China |
| Abstract: |
| A numerical method to analyze the flutter of hypersonic wing by coupling aerodynamics(with thermaltransmittance) with structural dynamics in time domain is studied in this paper. The aim is to analyze the effect ofthe inner temperature gradient on structural intrinsic properties and on flutter. The algorithm coupling unsteadycomputational fluid dynamics with thermal transmittance was used to get transient thermal field; the finite elementmethod was used to get the modes of the transient thermal field at different instants; the structural dynamics modelbased on modal superposition was coupled with the unsteady aerodynamic model based on Volterra Series to get theflutter dynamic pressure. A low-aspect-ratio wing was analyzed at Mach 5, 13km high. The implementability of thismethod was verified. Results show that the modal frequencies decrease with increasing temperature gradient and theminimum flutter dynamic pressure is at minimum difference between any two main mode frequencies. |
| Key words:
aerodynamic heating
computational fluid dynamics
finite element method
flutter(aerodynamics)
hypersonic aerodynamics
structural dynamics
thermal effects
transient analysis;aerodynamics/structural dynamics couplings
aerothermoelasticity
unsteady aerodynamic model
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| 收稿日期: 2011-12-08
修回日期:
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| DOI: |
| 基金项目: 国家自然科学基金重大研究计划(90816008)资助 |
| 通讯作者:
Email： |
| 作者简介: 陈浩(1988-)，西北工业大学硕士研究生，主要从事飞行器气动弹性力学研究。
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| 陈浩 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 |
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