一种热气动弹性的多场耦合方法及其实现
发布时间：2018-08-04 19:37
【摘要】：随着飞行速度的不断提高,高超声速流动条件下的热气动弹性问题受到越来越多的关注。与常规气动弹性问题不同,热气动弹性问题涉及到高温气体效应、边界层效应、结构热传导以及热辐射等研究内容,需要计算流体力学(CFD)、计算结构动力学(CSD)、计算热力学(CTD)等多门学科的相互配合才能得以解决。针对上述问题,本文借助多场耦合方法对高超声速机翼的热气动弹性问题开展了研究。首先研究了气动加热对结构振动特征的影响,通过耦合的热-结构分析,研究了结构在非均匀加热下振动特征的变化；其次,提出并实现了一种流体-热-结构三场耦合方法,应用该方法,在计算机集群上分析了机翼在不同加热强度下的振动特征变化；最后,对上述研究结果进行了总结。结果显示,气动加热会明显的降低机翼的振动频率,随着加热强度的变化,机翼的振动模式会发生比较复杂的转化。
[Abstract]:With the increasing of flight speed, more and more attention has been paid to the thermo-hydrodynamic elasticity in hypersonic flow. Different from conventional Aeroelastic problems, thermoAeroelastic problems are related to high temperature gas effects, boundary layer effects, structural heat conduction and thermal radiation. In order to solve this problem, the (CFD), of computational fluid dynamics (CFD),) and the calculation of structural dynamics (CSD), thermodynamics (CTD) and other disciplines are needed to solve the problem. In order to solve the above problems, the thermo-hydrodynamic elasticity of hypersonic wing is studied by multi-field coupling method. Firstly, the effect of aerodynamic heating on the vibration characteristics of the structure is studied, and the variation of the vibration characteristics of the structure under non-uniform heating is studied by coupled thermo-structural analysis. Secondly, a fluid-thermal-structure three-field coupling method is proposed and realized. Using this method, the vibration characteristics of the wing under different heating intensity are analyzed on the computer cluster. Finally, the results are summarized. The results show that aerodynamic heating can obviously reduce the vibration frequency of the wing. With the change of the heating intensity, the vibration mode of the wing will undergo a more complex transformation.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：V211.47
[Abstract]:With the increasing of flight speed, more and more attention has been paid to the thermo-hydrodynamic elasticity in hypersonic flow. Different from conventional Aeroelastic problems, thermoAeroelastic problems are related to high temperature gas effects, boundary layer effects, structural heat conduction and thermal radiation. In order to solve this problem, the (CFD), of computational fluid dynamics (CFD),) and the calculation of structural dynamics (CSD), thermodynamics (CTD) and other disciplines are needed to solve the problem. In order to solve the above problems, the thermo-hydrodynamic elasticity of hypersonic wing is studied by multi-field coupling method. Firstly, the effect of aerodynamic heating on the vibration characteristics of the structure is studied, and the variation of the vibration characteristics of the structure under non-uniform heating is studied by coupled thermo-structural analysis. Secondly, a fluid-thermal-structure three-field coupling method is proposed and realized. Using this method, the vibration characteristics of the wing under different heating intensity are analyzed on the computer cluster. Finally, the results are summarized. The results show that aerodynamic heating can obviously reduce the vibration frequency of the wing. With the change of the heating intensity, the vibration mode of the wing will undergo a more complex transformation.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：V211.47
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