摘要
以CFD流场与气动力计算为基础,分别利用小幅度强迫振动模式和差分两种方法推导了飞行器的纵向组合动导数计算表达式;建立了基于CFD技术的飞行器动导数计算方法;以国际标模Finner导弹为例,利用所推导的两种方法进行该导弹的动导数计算,重点分析了减缩频率对动导数计算的影响,提出了利用CFD方法开展动导数计算时减缩频率的选择原则;给出的计算结果与相关文献中的风洞实验结果吻合良好,表明基于CFD技术的动导数计算方法具有较高的工程实用价值。
Based on the art of Computational Fluid Dynamics （ CFD）, a computational method of dynamic derivatives for aircraft is built using the dynamic stability derivative expression deduced from small amplitude oscillation model and differential model respectively. In this paper, the basic Finner model is taken as an example, to compute the dynamic derivatives of this missile using this two methods, the effects of reduce frequency on the com- putation of dynamic derivatives are analyzed especially, some laws about choosing the reduce frequency for compu- tation using the CFD is raised. The numerical result is compared with wind tunnel test data; It appears that the numerical result is consistent with experiment data. It has significant practical value applied to engineering.
出处
《飞行力学》
CSCD
北大核心
2011年第4期15-18,共4页
Flight Dynamics
关键词
动导数
非定常流动
减缩频率
CFD
dynamic derivative
unsteady flow
reduce frequency
CFD
