无限质量降落伞充气动力学数值模拟

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。

Numerical simulation on parachute's infinite mass inflation dynamics

To analyze the supersonic opening performance parachute in Mars entry environment are studied. Based on the Multi-material Arbitrary Lagrange Euler (MMALE) method algorithm, the coupling models between compressible fluid and flexible structure of parachute are solved. The evolution of 3D shape of DGB parachute during supersonic inflation is simulated, and the structural dynamics behaviors of canopy fabric is predicted. The drag area and coefficients are compared with the wind tunnel data. The inflation performance of parachute and the influence of forebody are analyzed. Finally, the wake of unsteady fluid and distribution of shock wave around supersonic parachute are investigated. The results show: The DGB parachute is well inflated without seriously collapse. As the increase of Mach numbers, the drag coefficients gradually decrease, along with the increase of the inflation time, which bring into correspondence with the test results, and prove the validity of the method proposed in this paper.