Inflation process of radially closed parachute

Parachute closing technology can effectively control the parachute deployment process and overload and is an important technology to ensure the safe opening and normal use of the parachute. Radially closed parachutes are more effective in achieving faster and more consistent canopy inflation than traditional circumferential closing parachute technology. This study is based on numerical simulation technology and explores the working mechanism of the intake control system through comparison of experimental data. The ALE method (arbitrary Euler–Lagrangian penalty function method and multi-medium arbitrary Lagrangian–Euler algorithm) is used to construct the incompressible flow field and the coupled dynamic model of the radially closed and circumferentially closed parachute structures. Combined with the inflated shape of the airdrop test, the simulation results of the two types of closed parachutes are compared and analyzed. The study found that the radially closed parachute forms a high-pressure area through the inner parachute and a low-speed vortex area inside the canopy, which increases the pressure difference between the inside and outside of the canopy, makes the inflation more full, the stress distribution more uniform, and the parachute opening overload and speed better. It is suitable for the delivery and recovery of heavy-duty materials at low altitude and lays the foundation for further improved design and engineering application of the air intake control system.