速度对火星用盘缝带伞超声速开伞性能影响

摘要

Based on the space-time conversation/solution(CE/SE) algorithm in LS-DYNA code,super-sonic deployment of a parachute in the Martian atmosphere is studied .The effect of flow velocity on the performance of the parachute is discussed by numerical simulation to provide reference for the design of Mars parachute .By comparison of the canopy shape , projection area , the resistance coefficient and the canopy surface stress in different Mach number ,the following conclusions are drawn:with the increase of the flow velocity ,the projected area of the parachute increases and then decreases ,maximum value at 1 .6 Mach number .The drag coefficient increases at first and then decreases with the increase of the flow ve-locity.The canopy surface stress is larger in the central region of disk and band , the maximum surface stress increases with the increase of the flow velocity .Finally,the effect of the parachute rope length on the parachute performance is also studied .%基于LS-DYNA软件中的时－空守恒元／解元算法（即CE／SE算法）对降落伞在火星大气环境下的超声速开伞性能进行研究。通过数值仿真探讨来流速度对其性能的影响，为火星用盘缝带伞的设计提供参考。通过对各马赫数下伞衣的外形、投影面积、阻力系数和伞衣表面应力的情况进行比较，得出以下结论：随着来流速度的增加，降落伞的投影面积先增大后减小，在1．6马赫左右最大；阻力系数随着来流速度的增加也先增大后减小；伞衣表面应力在伞衣带和伞衣盘的中部区域最大，随着来流速度的增加，表面的最大应力值也逐渐增大。最后，研究了伞绳长度对降落伞性能的影响。