平流层飞艇大迎角气动特性分析

为了获得大迎角下的平流层飞艇的气动特性,基于N-S方程及k-ωSST湍流模型,对某平流层飞艇的大迎角气动特性进行数值模拟分析.结果表明：平流层飞艇的大迎角失速特性及力矩特性与飞机具有较大的区别,飞艇的失速迎角较大（45°左右）;俯仰力矩特性在失速前呈现完全不同的两种趋势,小迎角范围内其静不稳定,迎角增加到一定程度后变为静稳定且维持该状态直至失速.研究结果对平流层飞艇的大迎角操稳设计、飞控设计具有重要的参考意义.

Large attack angle aerodynamic Analysis of a stratospheric airship

In order to obtain the aerodynamic characteristic of the stratospheric airship with large angle of attack, aerodynamic numerical simulation analysis is accomplished based on N-S equations and k-ωSST turbulent flow model. It is found that there are big differences between the stratospheric airship and aircraft on the stall and torque characteristics. The stall angle of the airship is larger（around 45°）and the charaeteristic of pitch moment presents entirely different trends before stall. It indicates that the airship is statically instable within small angle of attack, but statically stable when the angle increases to some extent and will keep the state until stall. The study results are of some important reference value to controllability and stability design as well as flight control design of stratospheric airship with large angle of attack.