空气动力学学报Issue(5)：714-719,6.DOI:10.7638/kqdlxxb-2014.0081
环帆伞稳降阶段织物透气性影响数值模拟
Numerical simulation of the effect of the permeability on the ringsail parachute in terminal descent stage
摘要
Abstract
For the study of the influence of permeability of fabric on aerodynamic perform-ance of parachute,the permeability of fabric is described by the Ergun equation and introduced into the source term ,establishing a new governing equation of flow momentum with the permea-bility of fabric fully considered .The numerical solution is get and compared with the traditional result,in which the influence of permeability of fabric was ignored.The result shows that the ve-locity penetrating the fabric can be obtained through the new flow field momentum equation and it’s obviously lower than the velocity of the flow through the surrounding holes and that around the parachute.The first wake vortex region which clings to the canopy and the second wake vor-tex region which consists of a pair of center points are in the wake of the canopy,the permeability of fabric makes the first wake vortex region longer,the number of the vortex points increase and the distribution of the vortex more uniform and symmetrical.It also decreases the size of the sec-ond wake vortex,which improves the stability of the canopy through a shorter and narrower whole wake vortex region.Besides,the permeability of fabric decreases the pressure inside the canopy,increases the pressure outside.The pressure coefficient of the canopy in the radial direc-tion decreases,thus,the drag coefficient of the new model is lower than the traditional model, which is closer to the results of the airdrop experiments.Obviously,the new model is significant to improve the accuracy of flow field simulation around the porous canopy.关键词
降落伞/数值模拟/湍流模型/织物透气性/流场结构/尾涡流态Key words
parachute/numerical simulation/turbulence model/permeability of fabric/flow field structure/wake vortex分类
航空航天引用本文复制引用
杨雪,余莉,李允伟,李岩军..环帆伞稳降阶段织物透气性影响数值模拟[J].空气动力学学报,2015,(5):714-719,6.基金项目
国家自然科学基金（11172137）；航空科学基金 （）
