降落伞开伞过程的多结点模型仿真

根据降落伞的结构和力学特征,在轴对称假设下创建了伞衣及回收物系统的多结点结构模型.通过考虑应力,重力和气动力的作用效果,建立了用于无气流攻角平面圆形降落伞充气模拟的多结点结构模型动力学方程组.对开伞过程中的流场变化引入准定常假设,利用simple算法数值模拟求解RNG(Renormalization Group)k-ε湍流模型下的雷诺平均N-S(Navier-Stokes)方程以获得选定时刻的伞衣表面压力分布.结合多结点模型动力学方程组的解算代码和计算流体力学程序,采用流固耦合的方法对选定的平面圆形降落伞模型的开伞过程进行了动态仿真,得到了开伞过程中降落伞外形和特性的变化.通过结果分析和比较,证明了多结点模型的可行性,发展出了一种用于降落伞流固耦合计算的新方法.

Simulation of parachute-s opening process with multi-node model

Multi-node model of canopy and parachute system under axisymmetrical hypothesis was set up according to their structural and mechanics characteristics. Dynamics equations of this model for simulating inflation process of flat circular parachute with no angle of attack have been constructed by considering the effect of stress, gravity and pressure. On the assumption that the evolvement of fluid field is quasi-steady, the pressure values on the canopy at selected moments were calculated out by solving RANS(Reynolds averaged navier-stokes) equations of RNG(renormalization group) k-ε turbulence model with simple algorithm. With the combination of dynamics equations code and CFD(computational fluid dynamics) program, the fluid-structure interaction study of a selected parachute was carried out, and the change of its shape and characteristics was simulated. The feasibility of multi-node model is confirmed by analyzing calculated results and comparing them with those from some other researches. A new method to study the fluid-structure interaction of parachute is established.