飞行器组合及单独动导数数值求解方法研究  

Calculating Combined and Single Dynamic Derivatives of Flight Vehicle

作　　者：米百刚[1] 詹浩[1] 樊华羽 

机构地区：[1]西北工业大学航空学院,陕西西安710072

出　　处：《西北工业大学学报》2015年第4期540-545,共6页Journal of Northwestern Polytechnical University

基　　金：航空科学基金(2012ZA53003)资助

摘　　要：基于CFD方法,对于飞行器的动导数精细单独求解方法进行了研究。以纵向为例,使用基于刚性动网格技术的小幅度强迫俯仰振荡方法来辨识纵向的组合动导数,进一步使用小幅度升沉振动法求解时差动导数以及采用圆环域入口附加线性变化速度的方式来模拟定常拉升运动求解阻尼导数2种方法实现动导数的分开单独求解。对国际动导数标准模型Finner导弹进行了计算验证,纵向力矩系数组合动导数以及各单项动导数值与风洞试验以及文献结果吻合较好,使用通过准定常拉升运动求解阻尼导数实现动导数分开求解的方法具有耗时少、精度高的特点,这些方法都能够推广到横航向,实现各个方向的动导数精细单独模拟,为飞行器动态气动设计提供依据。The fine calculations of single dynamic derivatives of flight vehicle are carried out with computational fluid dynamics （ CFD） technology. We take longitudinal dynamic derivatives to illustrate this method. Firstly, the combined dynamic derivative was calculated with the unsteady methods of small amplitude pitching oscillation. Then two methods were employed to calculate single derivatives： the first method focused on obtaining lag of wash derivative by using small amplitude plunging oscillation method; the other method dealt with the damping derivative based on steady pulling？out motion, which used the arc tube domain and the inlet velocity was controlled with linear algebraic expression. Finally the other single derivative could be calculated through the difference between the combined dynamic derivative and one single derivative. We took the Finner missile as example to verify the methods, the cal？culation results of combined and single dynamic derivatives agreed well respectively with those of experiment and reference. The research shows that the methods to separate dynamic derivatives have been proved to be reliable and useful in engineering, and the method to calculate damping derivative is simple and time consuming, and all these methods can also be used in lateral and directional dynamic derivative analysis as well as that of longitudinal.

关 键 词：组合动导数 阻尼导数 时差导数 计算流体力学 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]