Abstract
To decrease the opening shock as well as improve the resistance coefficient and stability of the parachute of aviation weapon under subsonic conditions, a new kind of high-damping four-winged rotating (HFWR) parachute is investigated in this paper. The transient dynamic behavior and aerodynamic characteristics of the parachute during the inflation process are studied. Considering the permeability, the 3D folded finite element (FE) model of the HFWR parachute is established based on the direct folding modeling technique, and the inflation process of the parachute under subsonic flow is simulated using the multimaterial arbitrary Lagrange–Euler (ALE) method. A series of wind tunnel tests are conducted to verify the numerical results. Besides, the opening performances of the HFWR parachute and the round parachute, which includes the inflation process, the dynamic response of the swing angle, and the opening shock load varying with time, are compared under the same conditions. The results show that the opening performance of the HFWR parachute is superior to the round parachute under specific military background. The fluid-structure interaction (FSI) simulation results show good consistency with the wind tunnel tests, which indicates that the numerical modeling can effectively simulate and predict the opening performance and aerodynamic characteristics of the rotating parachute. The modeling method in this paper can help shorten the development cycle, improve the cost effectiveness, and optimize the design of the parachute.
Highlights
Parachutes are widely used as devices for stability, posture adjustment, and deceleration in the air for stand-off aviation weapon systems
The inflation process of a new type of high-damping four-winged rotating (HFWR) parachute for the stand-off aviation weapon is studied. e fluid-structure interaction (FSI) finite element model of the parachute and the surrounding fluid domain is established. e transient dynamic behavior and fluid domain evolution of the HFWR parachute in an infinite mass scenario are investigated. e variation of rotation rate and opening shock of the HFWR parachute at different flow speeds is analyzed. e FSI simulation results are verified by the wind tunnel test data
Based on the results obtained in this paper, the following conclusions are summarized: (1) e HFWR parachute can quickly reach the steady state with good inflation performance, and there is no obvious “breathing phenomenon” during the inflation process
Summary
Parachutes are widely used as devices for stability, posture adjustment, and deceleration in the air for stand-off aviation weapon systems. To meet the tactical requirements of good stability, short endurance, and small opening shock load and volume and weight as well as low cost, the rotating parachute is employed in the aviation weapon system. Erefore, it is necessary to investigate the parachute inflation process in depth. The research on the numerical simulation of the parachute inflation process is still in its infancy, which is mainly focusing on the round parachute, and there is still short of relevant research studies on the rotating parachute inflation process. Compared with the round drag parachute, the transient dynamic characteristics of the rotating parachute in the nonlinear, large deformation, and FSI inflation process will be more complicated due to the rotating
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