中文摘要：

为研究无人机机载导弹发射过程中载机——导弹之间存在的气动干扰特性、导弹运动规律和导弹射流对无人机的冲击，采用计算流体力学方法对导弹发射过程进行了数值模拟。结合刚体六自由度运动方程，将非结构动网格技术应用于机载导弹发射问题中，通过求解三维非定常Ns方程得到流场信息。通过算例，验证了上述数值方法在处理具有复杂外形、较大相对位移运动问题的能力。计算结果表明，由于导弹发动机推力的影响，载机、导弹之间的气动干扰作用时间较短，影响较小。在一定条件下导弹高温射流对无人机安全会构成威胁。

英文摘要：

Reconnaissance and Strike Unmanned aerial vehicles （R/S UAV） which is the combination of reconnaissance UAV and strike UAV platform has played an important role in the Battlefield. After founding ground targets, R/S UVA can distinguish and attack the most threatening one rapidly with carried missile under wings. R/S UAV platforms usually gets a relatively small fuselage which might be threatened by the unsteady aerodynamic forces and high-temperature engine jet flow during missile launch. In order to study the security of R/S UAV during the launch, the process is simulated by using the method of the computa- tional fluid dynamics （CFD）. Combination of missile engine jet flow and aircraft flow fields was proposed in the simualtion to improve accuracy. The aerodynamic and flight behavior of UAV and missile during the tran- sition process are simulated. Factors like aerodynamic interference, the rules of missile movement and the interaction between UAV and missile jet flow are considered in the simulation. Unstructured dynamic mesh is used coupled with an unsteady flow solver, and a 6-DOF model is fully integrated into the CFD solution procedure to determine the body dynamics. The results obtained for a time-accurate missile launch from the R/S UAV by the developed numerical methods are presented. The investigation show that the interference between missile and UAV would be much less because of the missile engine jet flow, which means there are low collision risks between R/S UAV and missile under most launch conditions, the flight performance of R/S UAV is not affected by missile jet greatly. However the erosion threaten would be posed to R/S UAV by high temperature missile jet flow under some certain conditions.