外挂物气动力建模对机翼/外挂物颤振特性的影响及修正

Influence of Store Aerodynamic Modeling on Wing-store Flutter Characteristics and Store Aerodynamic Correction

在某机翼/外挂物颤振建模中,采用了两种外挂物气动力理论模型,即十字交叉升力面模型和细长体模型。首先对两种气动力理论进行了简要介绍,并给出了常用的气动力修正方法。采用两种外挂物气动力模型分别进行了机翼/外挂物颤振计算,并比较了单独外挂物刚体模态下两种气动力模型对应的广义气动力系数。针对细长体模型,还进行了截面宽高比变参分析。结果显示细长体理论结果对该参数不敏感。最后采用一种简化的气动力修正方法,对外挂物十字交叉升力面模型进行了修正。结果表明,外挂物气动力修正对其颤振特性具有重要的影响。

The aim of the present work is focused on wing-store flutter problem and its dependence on store aerodynamic modeling and store aerodynamic modeling correction.Crossing panel model and slender body model are applied in wing-store flutter modeling.Firstly,a brief introduction of these two methods is conducted,and a well known aerodynamic correction method is reviewed.Wing-store flutter analysis is carried out using these two store aerodynamic models,and the generalized aerodynamic influence coefficients are compared with respect to single store＇ s six rigid body modes.Parametric analysis is also delivered for the varied height/width ratio of store body,and the result shows that the height/width ratio is not a sensitive parameter in slender body theory.Finally,the crossing panel model is modified by a simplified correction method with a single factor.The result shows that the store aerodynamic correction has strong implication on wing-store flutter characteristics.