开缝伞充气过程流固耦合数值研究

doi:10.7527/S1000-6893.2013.0264

Abstract

Abstract:

To investigate the complex dynamic interaction behaviors of a slot-parachute, a numerical simulation analysis is performed on the inflation process of a slot-parachute used in airdrop. Based on the parametric design language, a fluid-structure interaction (FSI) model is built which consists of a 3D initially folded slot-parachute structure with a cylindrical fluid domain. Then, an FSI dynamics solver is set up by the Euler-Lagrangian penalty algorithm and multi-material ALE (Arbitrary Lagrange Euler) method specifically for the solving of low speed incompressible fluid fields around a canopy. The structure dynamic behaviors of the canopy fabric are predicted, and a non-linear damped material model of a rope is developed. Meanwhile, the inflation characteristics of the slot-parachute in different inflowing velocities are analyzed, including the variation of projective area and opening loads. The 3D simulation results of inflation are validated by comparing with the airdrop test results. Finally, the slot-parachute’s FSI characteristics are acquired, including its structure intensity and the evolvement of flow during the inflation process. The results demonstrate that the 3D profile change of the canopy is consistent with the airdrop test, and the slot-parachute can rapidly keep steady after fully inflated without the occurrence of obvious breath phenomenon. The stress near the slots is obviously higher than the average level on the canopy surface. To avoid the breakage of the fabric structure under the actions of complex airflow pressure, reinforcements should be taken. A symmetrically reverse rotated vortex couple appears on top of the canopy during the inflation process, and then it is extruded to dissymmetry before being separated and brushed off by airflow.

Key words: parachute, fluid-structure interaction, numerical model, incompressible flow, inflation process

CLC Number:

V441.8

GAO Xinglong, TANG Qian'gang, ZHANG Qingbin, LI Jinhong. Numerical Study on Fluid-structure Interaction of Slot-parachute’s Inflation Process[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013, 34(10): 2265-2276.

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Numerical Study on Fluid-structure Interaction of Slot-parachute’s Inflation Process

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