摘要
基于LS-DYNA软件中的任意拉格朗日-欧拉方法(ALE方法)通过改变面积和来流速度两种方式改变降落伞雷诺数,获取雷诺数对降落伞开伞性能和阻力特性的影响,为低雷诺数风洞试验的小型降落伞试验数据向大型降落伞进行缩尺外推提供参考。通过对不同速度和面积下伞衣的外形、开伞时间、最大动载和阻力系数的情况进行比较,得出以下结论:来流速度在20~50 m/s的范围内,对相同面积的降落伞,来流速度越大,雷诺数越大,开伞越快,最大动载越大,稳降阻力越大,稳降阻力系数越小;相同雷诺数下,降落伞面积越大,开伞越慢,最大动载越大,稳降阻力越大,稳降阻力系数越大;相同来流速度下,降落伞面积越大,雷诺数越大,开伞越慢,最大动载越大,稳降阻力越大,稳降阻力系数越大。
Based on the Arbitrary Lagrangian-Eulerian(ALE)method in LS-DYNA software,the Reynolds number of parachutes is altered by modifying both the area and incoming flow velocity.This study examines the effect of Reynolds number on parachute opening performance and drag characteristics,providing a reference for scaling up small parachute test data from low Reynolds number wind tunnel tests to large parachutes.By comparing the parachute shape,opening time,maximum dynamic load,and drag coefficient under different velocities and areas,the following conclusions are drawn:Within the incoming flow velocity range of 20 m/s to 50 m/s,for parachutes of the same area,the higher the incoming velocity,the larger the Reynolds number,the faster the opening time,the higher the maximum dynamic load,the greater the steady descent drag,and the smaller the steady descent drag coefficient.At the same Reynolds number,the larger the parachute area,the slower the opening,the higher the maximum dynamic load,the greater the steady descent drag,and the larger the steady descent drag coefficient.Under the same incoming flow velocity,the larger the parachute area,the greater the Reynolds number,the slower the opening,the higher the maximum dynamic load,the greater the steady descent drag,and the larger the steady descent drag coefficient.
作者
刘东宇
张红英
陈建平
LIU Dong-yu;ZHANG Hong-ying;CHEN Jian-ping(Nanjing University of Aeronautics and Astronautics,Nanjing 210000,China)
出处
《航空计算技术》
2025年第3期44-48,54,共6页
Aeronautical Computing Technique
基金
航空科学基金项目资助(2023M030010002)。
关键词
降落伞
雷诺数
阻力系数
数值模拟
parachute
reynolds number
drag coefficient
numerical simulations
作者简介
刘东宇(2000-),男,江苏南京人,硕士研究生。
