Study of the fabric permeability effect on parachute dropping based on ale method

The fabric permeability has great effect on parachute opening and deceleration characteristics,therefore that property would be fully considered in parachute design. however whether the fabric permeability is reasonable needs a series of airdrop experiments to confirm. in this paper,the c9 parachute was taken as the research object,and then the finite element method based on arbitrary lagrange euler (ale) algorithm was used to simulate the actual airdropping process,and the ergun equation to simulate the dynamic permeability. through the explicit calculation,the deceleration characteristics such as dropping velocity,acceleration,and rich flow field information were obtained. four models with different fabric permeability were calculated by the above method in this paper. according to the results analysis,it was found that the parachute opening is related with the size of bulb shape,and the bulb shape formed in inflating process is closely related with the fabric permeability,which could be used to guide the parachute design.