W型无尾飞机的操纵机理与稳定特性研究

 W型无尾飞机基于前掠翼及翼身融合的一体化设计，取消了平尾和垂尾，可大幅降低雷达反射截面积，减轻结构重量；同时具有亚声速气动效率高、横航向操纵面效率高的优势。根据该构型的特点，配置设计了新型的多操纵面，并研究了其新的操纵机理。在此基础上，计算分析了这一新布局飞机特殊的三轴稳定特性，研究表明，W型无尾飞机的纵向阻尼不足，纵向短周期和长周期模态分别仅满足III级和II级飞行品质；横航向都是静不稳定的，动稳定性表征为滚转模态的发散和荷兰滚模态稳定，并分析了其可能的物理成因。最后研究了横航向静稳定性导数对W型无尾飞机横航向稳定边界的影响。研究方法和结果对于新布局飞机初步设计具有重要参考价值。

Research on Control Principles and Stability Characteristics of W-shaped Tailless Aircraft

The W-shaped tailless aircraft has not stabilizer and vertical tail,and it is based on the design of forward-swept wing and the integrated design of blended wing-fuselage.Because of the change of configuration,the radar cross section of this aircraft decreases greatly,and the structural weight lightens.This aircraft also has advantages of high aerodynamic efficiency in subsonic velocity,and high control efficiency of lateral-directional control surfaces.According to the characteristics of this configuration,firstly,the innovative control-surfaces are designed which fit this special configuration,and the control principles are also researched.Then,the special longitudinal and lateral-directional stability characteristics of this aircraft are computed and analyzed.This aircraft's longitudinal damping is unsatisfactory,and its long period and short period mode's flying quality just satisfies second and third class respectively.It has lateral-directional static instability,and also dynamic instability.But this aircraft's dutch roll mode is stable,and the possible physical reason is analyzed.Finally,the influences on the lateral-directional stability boundary caused by the lateral-directional static stability derivations which are different from the conventional aircraft's are researched in detail.The research methods and results have important reference meaning in the new configuration aircraft's preliminary design.