基于控制体积方法的降落伞初始充气模型

Numerical Simulation of Parachute Initial Inflation Phase Based on Control Volume Method

考虑降落伞初始充气过程中降落伞变形情况与受力特性,建立了基于控制体积方法的初始充气模型。模型从理想气体状态方程出发,通过伞衣内部气体质量求解伞衣内部各个部分所受压力,将压力结果代入基于凯恩方法建立的伞衣结构模型中,即可得到对应的伞形;模型在计算时能够考虑伞衣结构透气的影响。数值计算的结果表明,模型计算得到的初始充气过程伞衣形状变化与试验吻合较好,初始充气时间与经验公式基本一致。该方法还可用于对降落伞主充气阶段的数值模拟。

Considering the parachutes＇ structural and dynamics characteristics during initial inflation phase,an initial inflation model for parachutes was established based on Control Volume Method.According to the ideal gas law,pressure values of different parts of the canopy could be calculated by the mass of the gas inside the parachute,then the shape of the canopy could be obtained by Kane＇s method.Dynamics equations of this model was constructed by considering the canopy porosity.Numerical results were well consistent with the experimental results.The dynamical model can be also used for simulation of the parachute final inflation phase.