十字伞伞群的多节点静力学模型动力特性计算

为计算某型救灾专用空投系统十字伞伞群的气动特性,建立了多节点静力学模型来计算伞衣充满时的气动外形;对不同臂长比和伞绳比的十字伞进行数值模拟,并与文献中风洞实验结果对比验证;根据建立的模型得到十字伞伞群的气动外形并进行气动力特性研究.结果表明:计算结果和文献结果一致性较好,建立的多节点静力学模型合理可行;十字伞轴向力随臂长比和伞绳比的增大而增大;随攻角增大轴向力先减小后增大,而法向力则增大.建立的模型可用于伞群的气动外形计算,并为降落伞系统的设计提供参考.

Multi-node statics model and aerodynamic characteristics of cross parachute clusters

To calculate clusters’ aerodynamic characteristics for a certain type of disaster relief airdrop system,multi-node statics model of cross parachute system was developed to calculate the aerodynamic shape of canopy.Different cross parachute models were numerically simulated with different canopy arm ratios and suspension line ratios,and the numerical results were compared with test results in literature.According to this model,and aerodynamic shape was obtained for cross parachute clusters,and aerodynamic characteristics were simulated.The results show that:the calculated results and wind tunnel test results in literature are in good agreement,and the multi-node statics model is accurate and feasible.As canopy arm ratio and suspension line ratio of cross parachute increase,the axial force increases;as the angle of attack increases,the axial force firstly decreases and then increases,whereas the normal force increases.This model can be used for calculating aerodynamic shape of parachute clusters,which is also useful for parachute system design.