冲压翼伞流场与气动操纵特性的数值模拟  

Numerical simulation of flow field and handling aerodynamic characteristics of ram-air parachute

作　　者：张春[1] 杨倩[2] 袁蒙 曹义华[1] 

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100191 [2]北京空间科技信息研究所图书馆,北京100086 [3]中国航天科工集团第四研究院第九总体设计部,武汉430040

出　　处：《航空动力学报》2013年第9期2037-2043,共7页Journal of Aerospace Power

摘　　要：采用有限体积法求解shear stress transport(SST)k-ω二方程湍流模型下的Navier-Stokes(N-S)控制方程,对冲压翼伞的气动特性进行数值模拟,分析翼伞的流场机理和气动操纵特性.模拟得到的升阻特性与试验数据较吻合,在此基础上分析前缘切口、弧形下反以及稳定幅对升阻特性的影响.通过软件Fluent实现了非定常流动模拟,研究了翼伞的非定常升力特性,其升力系数的脉动受脱体涡的非定常过程影响,当迎角为16°时,翼伞升力变化周期为0.36s.最后分析了翼伞稳定滑翔阶段的纵向静稳定性,相比于单边后缘下拉方式,通过闭合翼伞一侧进气口实现航向操纵更稳定有效.The aerodynamic characteristics of ram-air parachute were numerically simulated to analyze flow field mechanism and handling aerodynamic characteristics.Finite volume method was used to solve Navier-Stokes（N-S）equations and shear stress transport（SST）k-ωtwo-equation turbulence model was applied to simulate the turbulence.The liftdrag characteristics agreed with the wind tunnel data,and the influences of leading edge cut,arc anhedral and static panel on the lift-drag characteristics were studied.The unsteady features of ram-air parachute were calculated by software Fluent to study unsteady lift characteristics and the phenomenon of lift coefficient pulsation was caused by unsteady detached eddy.When angle of attack is equal to 16°,the cycle of lift coefficient is 0.36s.Finally,the longitudinal static stability of ram-air parachute in steady gliding stage was analyzed and two different patterns of turning were compared.Compared with the method of edge deflection on one side,the method of closing intakes port on one side is more stable and effective.

关 键 词：冲压翼伞 数值模拟 升阻特性 非定常 气动操纵特性 

分 类 号：V211.59[航空宇航科学与技术—航空宇航推进理论与工程]