中文摘要：

收口伞具有很好的减载效果，为研究收口比对充气性能及阻力面积的影响，文章首次采用流固耦合数值方法对收口伞进行收口比影响研究。首先对某未收口环帆伞进行了流固耦合数值计算，试验结果验证了该数值方法的可行性。之后，在13％～28％范围内选取5种不同收口比进行了充气过程计算，研究了不同收口比下外形、开伞载荷、阻力面积和收口绳张力的变化情况，并拟合出相应的关系公式。研究结果表明：收口比对进气口张开速度没有影响，但会影响进气口、伞顶孔的首次张开时间。收口比和收口直径比、阻力面积比成二次方关系，和最大开伞动载呈线性关系。收口比为19％时，收口绳张力最大。上述结果可以为收口绳的选择及收口比的优化设计提供参考。

英文摘要：

Reefed parachute can achieve an obvious load reduction. To study the influence of reefing ratio on inflation performance and drag area,the fluid-structure interaction numerical method was proposed to study the influence of reefing ratio. Firstly, the fluid-structure interaction numerical calculation of an un-reefed ringsail parachute was conducted, and its feasibility was verified by test results. Secondly, the inflation stage of reefed parachute including five reefing ratios from 13% to 28% was simulated.The changes of canopy shape, opening load,drag area and tension of reefing line under different reefing ratios were studied. The corresponding relationship formulas were fitted. The results show that the inlet open speed is not affected by the reefing ratio,but the first open time points of inlet and vent are affected by the reefing ratio. The reefing ratio is in quadratic relationship with reefing diameter ratio and drag area.And the reefing ratio is in linear relationship with the maximum opening load. The tension of reefing line is the maximum when the reefing ratio is 1 9%. These results can provide reference for the selection of reefing line and optimization design of reefing ratio.