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Effect of elastic deformation on flight dynamics of projectiles with large slenderness ratio

机译：弹性变形对长细比大的弹丸飞行动力学的影响

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The elastic deformation of modern projectiles with large slenderness ratio cannot be ignored with the increasing of flight speed and maneuverability. Unsteady Reynolds-averaged Navier-Stokes (URANS) Equations are solved through CFD technique in this paper. Based on the frame of unstructured mesh, techniques of rigid-motion mesh and inverse-distance-weighted (IDW) morphing mesh are adopted to treat the rigid motion caused by flight dynamics and flexible structure deformation due to aeroelasticity, respectively. Moreover, the six degree of freedom (SDOF) dynamic equations and static aeroelastic equation are solved through the aerodynamic coupling. Numerical results of both free flight case and aeroelastic case calculated by the in-house code agree well with the experimental data, validating the numerical method. A projectile model with X-X configuration is constructed to investigate the effect of elastic deformation on the flight dynamics. Comparison results show that the longitudinal oscillation is more affected by the elastic deformation than the centroid motion, and the oscillation cycle of the orientation angle increases. Furthermore, the trajectories of rigid models with various centroid locations are simulated, illustrating that the elastic deformation could move the aerodynamic center forward and weaken the margin of the static stability margin. In the end, detailed analysis and comparison of the pressure distribution indicates the mechanism by which the elastic deformation leads to the movement of the aerodynamic center and changes the flight dynamic characteristics of the flexible projectile. (C) 2017 Elsevier Masson SAS. All rights reserved.
机译：随着飞行速度和机动性的提高，大细长比的现代弹丸的弹性变形不容忽视。本文采用CFD技术求解了非稳态雷诺平均Navier-Stokes（URANS）方程。在非结构化网格框架的基础上，分别采用刚度运动网格和反距离加权变形网格技术处理由于飞行动力学和气动弹性引起的柔性结构变形引起的刚度运动。此外，通过气动耦合求解了六自由度动力学方程和静态气动弹性方程。内部代码计算的自由飞行情况和气动弹性情况的数值结果与实验数据吻合良好，验证了数值方法的有效性。构建具有X-X配置的射弹模型，以研究弹性变形对飞行动力学的影响。比较结果表明，纵向振动比质心运动受弹性变形的影响更大，取向角的振动周期增加。此外，仿真了具有不同质心位置的刚性模型的轨迹，表明弹性变形可以使空气动力学中心向前移动并削弱静态稳定裕度的裕度。最后，通过对压力分布的详细分析和比较，揭示了弹性变形导致气动中心运动并改变柔性弹丸飞行动力学特性的机理。 （C）2017 Elsevier Masson SAS。版权所有。

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