西北工业大学学报
西北工業大學學報
서북공업대학학보
JOURNAL OF NORTHWESTERN POLYTECHNICAL UNIVERSITY
2015年
4期
540-545
,共6页
组合动导数%阻尼导数%时差导数%计算流体力学
組閤動導數%阻尼導數%時差導數%計算流體力學
조합동도수%조니도수%시차도수%계산류체역학
computational fluid dynamics%turbulence models%angular velocity%angle of attack%mesh generation%combined dynamic derivative%damping dynamic derivative%lag of wash dynamic derivative
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。
基于 CFD 方法，對于飛行器的動導數精細單獨求解方法進行瞭研究。以縱嚮為例，使用基于剛性動網格技術的小幅度彊迫俯仰振盪方法來辨識縱嚮的組閤動導數，進一步使用小幅度升沉振動法求解時差動導數以及採用圓環域入口附加線性變化速度的方式來模擬定常拉升運動求解阻尼導數2種方法實現動導數的分開單獨求解。對國際動導數標準模型 Finner 導彈進行瞭計算驗證，縱嚮力矩繫數組閤動導數以及各單項動導數值與風洞試驗以及文獻結果吻閤較好，使用通過準定常拉升運動求解阻尼導數實現動導數分開求解的方法具有耗時少、精度高的特點，這些方法都能夠推廣到橫航嚮，實現各箇方嚮的動導數精細單獨模擬，為飛行器動態氣動設計提供依據。
기우 CFD 방법，대우비행기적동도수정세단독구해방법진행료연구。이종향위례，사용기우강성동망격기술적소폭도강박부앙진탕방법래변식종향적조합동도수，진일보사용소폭도승침진동법구해시차동도수이급채용원배역입구부가선성변화속도적방식래모의정상랍승운동구해조니도수2충방법실현동도수적분개단독구해。대국제동도수표준모형 Finner 도탄진행료계산험증，종향력구계수조합동도수이급각단항동도수치여풍동시험이급문헌결과문합교호，사용통과준정상랍승운동구해조니도수실현동도수분개구해적방법구유모시소、정도고적특점，저사방법도능구추엄도횡항향，실현각개방향적동도수정세단독모의，위비행기동태기동설계제공의거。
The fine calculations of single dynamic derivatives of flight vehicle are carried out with computational flu?id 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 deriva?tive 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 alge?braic 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.
