Research on the inflation process of the drag parachute in the landing of first-stage booster and its key parameters

摘要

In the process of parachute control for the first-stage booster, the working performance of the resistance umbrella is an important part of the recovery system. In order to solve the safety problem caused by the excessive opening load of the suspension line during the deployment, the opening performance of the drag parachute was analyzed to ensure the safety and reliability of recycling, the process of the inflation phase of a combination of the first-stage booster and drag parachute was studied. The two-dimensional mathematical model of the parachute inflation phase was established based on the formula for changing the area with twice-inflation, and the formula for the added mass of the inflation radius. The changes of the main influencing factors of the opening load during the inflation process are analyzed, and the theory is analyzed to validate the correctness of the model, then the influence of the change of key parameters on the recovery process is studied. Simulation shows that the larger the drag area of the second reefing stage, the lower the stable descent speed of the system, and the increase in the drag area of second reefing stage, inflation index and coefficient of added mass will increase the second peak of the opening load.