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采用CFD/CSD耦合方法计算了纵向平面内细长旋成体的静气动弹性问题,研究了不同攻角下弹性变形对细长旋成体压心位置的影响规律。流场计算采用可压缩N-S方程求解,湍流模型采用可实现k-ε模型;采用自动支撑惯性释放方法计算了无约束细长旋成体的静气动弹性变形。算例结果表明:1随着攻角增大,静气动弹性变形呈现从一阶弯曲为主到一阶、二阶弯曲共存形式;2无论是刚体模型还是考虑静气动弹性变形的弹性体模型,其压心位置都随攻角增大而后移;3相同来流攻角下,静气动弹性变形使细长旋成体头部攻角增大,导致压心位置相对刚体模型靠前;4随着攻角增大,细长旋成体圆柱段上压力分布逐渐增加,弹性变形引起的头部压力增加对整体压心位置的影响逐渐减小,因此压心位置前移量逐渐减小。对于本文计算模型,弹性变形引起的压心位置改变量不超过弹身长度的1.55%。
The CFD / CSD coupling method is used to calculate the static aerodynamic elasticity of slender bodies in the longitudinal plane. The influence of elastic deformation at different angles of attack on the pressure center position of slender bodies is studied. The calculation of flow field is based on the compressible N-S equation, and the k-ε model is adopted for the turbulence model. The static-dynamic elastic deformation of the unconstrained slender body is calculated by the method of inertial release with automatic support. The results of numerical examples show that: 1 As the angle of attack increases, the static-dynamic elastic deformation presents the first-order bending to the first-order and the second-order bending coexistence; 2 Whether it is a rigid body model or an elastic body model considering static-dynamic elastic deformation, The center of pressure will increase with the angle of attack and then move backwards; 3, under the same angle of attack, the dynamic deformation of static aerodynamics increases the attack angle of slender body, As the angle of attack increases, the pressure distribution on the slender body segment gradually increases. The effect of head pressure increase on the position of the overall pressure center gradually decreases due to the elastic deformation. Therefore, the forward displacement of the pressure heart position gradually decreases. For this calculation model, the amount of change in the position of the center of pressure caused by elastic deformation does not exceed 1.55% of the length of the body.