无限质量降落伞充气动力学数值模拟

Numerical simulation on parachute's infinite mass inflation dynamics

为分析降落伞火星再入环境下的超声速开伞性能,基于任意欧拉-拉格朗日罚函数法和多介质任意拉格朗日欧拉算法,求解可压缩流场与降落伞结构的耦合动力学模型。数值模拟盘缝带伞超声速开伞过程外形变化,预测气动力作用下的伞衣织物三维结构动力学行为。结合风洞试验数据,对比分析降落伞开伞性能和前置体对伞衣充气外形的影响。最终给出超声速伞周围非稳态流场的尾流和激波分布。仿真结果表明:盘缝带伞在超声速开伞过程中被完全充满且充气效果良好,未出现塌陷情况;随着来流马赫数的增加,降落伞阻力系数逐渐减小,充气时间缩短。仿真结果与试验结果保持一致,验证了所提方法的有效性。

To analyze the supersonic opening performance of the parachute in Mars reentry environment, the coupling dynamic models between compressible fluid and flexible structure of parachute were solved on the basis of the arbitrary Euler-Lagrange penalty function method and the multi-material arbitrary Lagrange Euler algorithm. The evolution of 3D shape of DGB（disk gap band） parachute during supersonic inflation was simulated, and the structural dynamic behaviors of canopy fabric were predicted. The drag area and coefficients were compared with the wind tunnel data, and the inflation performance of parachute and the influence of fore-body were analyzed. Finally, the wake of unsteady fluid and distribution of shock wave around supersonic parachute were investigated. The results show that： the DGB parachute is well inflated without serious collapse; as the increase of Mach numbers, the drag coefficients gradually decrease, along with the increase of the inflation time, which brings into correspondence with the test results, and proves the validity of the proposed method.