Numerical of Effect of Suspension Line Length of Retraction of the Cruciform Parachute on the Static Aerodynamic Performance

In order to study the steerability and aerodynamic characteristics of cross parachute as an active control device, a finite element model of cross parachutes with a different retracting ratio δ (0, 10.0%, 12.5%, 15.0%, 20.0% and 25.0%) was established. Numerical simulation based on arbitrary Lagrange-Euler method was made, and the effect of asymmetry of canopy caused by the retraction of the suspension line on aerodynamic performance was analyzed. Results are as follows. The drag coefficient of the cross parachute decreases with the increase of the suspension retraction ratio, with different angles of attack (0°, 5°, 10°). The mean drag coefficient of cross parachute decrease with the increase of the suspension retraction ratio δ. The peak value of transient lift of the cross parachute increases with the increase of the suspension retraction ratio δ. The direction of the lift force generated by suspension retracting is always changing, which has a strong time-varying characteristic, pointing from the line retraction to the other side of the cross parachute.