涡环旋转伞流固耦合特性分析

以一种典型的涡环旋转伞为研究对象,采用任意拉格朗日-欧拉流固耦合方法模拟其在无限质量条件下的充气展开过程。计算得到了涡环旋转伞的充气展开和转速、开伞动载等时程变化曲线以及稳态阶段伞周围流场变化规律、伞衣织物的结构强度等流固耦合特性。结果表明:涡环旋转伞在来流12m/s时稳定转速约为3.1r/s,伞衣幅充满外形饱满,与伞塔试验结果吻合;稳态阶段涡环旋转伞上方产生大量涡核,涡核中心的连线类似于空间螺旋线;涡环旋转伞的阻力系数大于一般结构轴对称降落伞;伞衣幅与伞绳连接区域以及边缘区域应力明显高于伞衣幅平均应力水平。

Fluid-structure interaction characteristics analysis of vortex ring parachute

Based on arbitrary Lagrange-Euler method, the inflation process of a typical kind of vortex ring parachute was simulated in an infinite mass situation. The inflation process and the time-history changing curves of spinning rate and opening load were obtained, and the fluid-structure interaction characteristics of the fluid field around the canopy and the structural strength of the canopy fabrics were analyzed. The results show that the canopy inflated shape and the stable spinning rate of the calculation are in good agreement with the tower test data. In steady state, there are a plenty of vortex cores above the parachute, and the ligature of the cores is similar to a spiral line. The drag coefficient of vortex ring parachute is greater than that of other typical parachutes with axial symmetry structure. The stress of the connected region of the canopy and the suspension lines and the canopy fringing field are obviously greater than the average stress of the canopy.