基于ALE方法的群伞稳降阶段的数值模拟

随着计算机技术和数值模拟的兴起，精确描绘降落伞力学特性成为可能。文章采用任意拉格朗日-欧拉法对美国“阿波罗”飞船降落伞回收系统的稳降阶段进行了数值模拟。通过建立结构动力学与计算流体力学的耦合模型，研究了3具环帆伞的流固耦合过程，并模拟了降落伞的外形变化和伞衣内外流场的变化。流固耦合计算结果表明，各伞最终稳定在20＆#176;左右，环帆伞的群伞效率因数约为0.93，比C-9伞大。文章的分析结果对中国探月工程回收系统的主伞设计具有参考意义。

Numerical Simulation of Cluster Parachute System During Steady-state Descent Phase Based on ALE Method

With the rise of computer technology and numerical simulation, it is possible to describe accu-rately the dynamic chatacteristics of parachute. Based on arbitrary Lagrangian-Eulerian method, the steady-state descent phase of parachute recovery system of Apollo spacecraft is numerically simulated. With the establishment of coupled model of structural dynamics and CFD（Computational Fluid Dynamics）, the fluid-structure interaction study of three ring-sail parachutes was carried out, and the change of canopy shape and flow field is simulated. Results of Fluid-solid coupling calculation show that the parachute is steady around 20＆#176;, with the efficiency factor of cluster parachute system being about 0.93, which is bigger than that of C-9 parachute. This paper provides reference to the design of main parachute recovery system of Chinese Lunar Exploration Program.