摘要
研究了飞机在不同飞行高度、速度和姿态下,不同外挂物质量对投放安全性的影响。采用CFD方法计算外挂物所受气动力,通过六自由度刚体动力学方程计算外挂物的投放轨迹和姿态变化。准定常方法在计算外挂物下落轨迹的每个步长内,认为外挂物和载机都处在定常流场中,载机在投放过程中保持原有运动状态。通过算例给出了典型外挂物在不同速度、高度、姿态下投放的运动轨迹,分析了对安全投放有重要影响的因素,提出了减少外挂物投放风险的建议。
The trajectory of external stores separating from aircraft was computed in different flight conditionswith the quasi-steady method.In every step,the flow fields of external stores and aircraft were regarded as steadyand the aerodynamic forces acting on stores were calculated with the CFD method while keeping in the aircraft flightinitial states.A 6 DOF rigid body model was used to compute the trajectory resulting from the combination of thestores mass properties and aerodynamic loading.Separation of a generic wing-pylon-store configuration was givenand comparisons were demonstrated in flight states of different Mach number,altitude and attitude of aircraft.Thesafe separating effected by elements was concluded,and suggestions about risk-reduction were given.
出处
《飞行力学》
CSCD
北大核心
2011年第2期25-28,共4页
Flight Dynamics
关键词
外挂物
外挂物分离
准定常
external stores
store separation
quasi-steady
