针对某导弹斜喷发动机点火时飞行姿态大幅抖动现象,通过CFD数值模拟研究斜喷流对气动特性影响。结果表明:随着发动机点火过程中燃烧室总压急剧增大,喷流与外流场相互作用形成了干扰力和干扰力矩。由于这种干扰效应的非线性特征,会引起控制系统的异常响应,导致弹体姿态大幅抖动。文中提供的计算方法及分析结论为同类导弹总体优化设计提供理论依据。

To solve the problem that the large jitter of the flight attitude of a missile diagonal-nozzle engine during ignition, the influence of oblique jet on aerodynamic characteristics was studied by CFD numerical simulation. The results showed that with the sharp increase of the total pressure of combustion chamber during engine ignition, the interaction between the jet and the external flow field led to the disturbing force and the disturbing torque. The nonlinear characteristics of the disturbance effect would lead to exception response of control system and large jitter of missile attitude. The calculation method and analysis conclusions provided in this paper could provide a theoretical basis for the overall optimization design of homogeneous missiles.