Flutter of Delta Wing under Aerodynamic Heating
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摘要: 根据热气动弹性特点,探讨了气动加热温度对三角机翼模态特性和颤振特性的影响.基于热流量平衡方程,分析了气动加热下三角机翼的温度场;用有限元法求气动热效应下2个典型的超音速三角机翼模型的模态;按二阶活塞理论计算了翼面的非定常气动力,并用P-K法对颤振方程进行求解.计算结果表明,气动加热后结构的模态特性和颤振特性均发生变化;由于温度效应降低了各阶固有频率,改变了它们之间的差距,从而导致颤振速度降低.Abstract: From the characteristics of aerothermoelasticity,the effects of temperature in aerodynamic heating on the mode of a delta wing and the characteristic of its flutter were researched.The temperature distribution of the delta wing under aerodynamic heating was investigated with flux balance equation,and the influences of temperature on the natural dynamic characteristics of two typical supersonic delta wing models were analyzed with FEM(finite element method).The aerodynamic load was calculated with the second order piston theory of supersonic aerodynamics,and the flutter equations were solved with the P-K method.The research results show that aerodynamic heating will result in changes in the natural dynamic characteristics of the models,so the flutter velocity of the delta wing will decline sharply.
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Key words:
- wing /
- flutter /
- aerothermoelasticity /
- aerodynamic heating
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