共性半环翼跨介质航行器变体气动特性研究

基于一种特殊的双层半环形闭合翼构型,利用流体仿真软件对该构型跨越水空介质后变体过程中的不同状态进行了仿真,并对其非定常气动特性进行了分析;比较了特定条件下非定常状态和定常状态的气动参数随折叠角的变化曲线,得到了机翼展开和回收至不同角度的压力和速度分布云图以及对应位置的压力分布曲线;研究了不同变体速率对机翼变体的非定常气动特性的影响,并提出了附加动力学影响、流场迟滞影响等物理效应来解释该构型的非定常气动特性的形成原理。仿真结果表明,机翼回收过程的气动参数大于定常状态,展开过程气动参数小于定常状态,变体速率越大,非定常效应越明显,产生这种差异的原因是来自于流场迟滞的影响。

Study on aerodynamic characteristics of conformal semi-ring wing trans-medium vehicle variants

Based on a special double-layer semi-annular closed wing configuration, the different states of the configuration in the process of variant after crossing the water-air medium were simulated by using fluid simulation software, and its unsteady aerodynamic characteristics were analyzed. The curves of aerodynamic parameters of unsteady and steady states with folding angle under specific conditions were compared. The pressure and velocity contours and pressure distribution curves at different angles of wing deployment and recovery were obtained. The effects of different variant speeds on the unsteady aerodynamic characteristics of wing variants were studied. Additional dynamic effects and fluid hysteresis effects were proposed to explain the formation principle of the unsteady aerodynamic characteristics of the configuration. The simulation results show that the aerodynamic parameters of the wing recovery process are larger than those of the steady state, and the aerodynamic parameters of the unfolding process are smaller than those of the steady state. The larger the variant speed, the more obvious the unsteady effect is. The reason for this difference is the effect of the field hysteresis.