侧风对降落伞工况影响的数值研究  

Numerical Study on the Influence of Lateral Wind Field Effect on Parachute Condition

作　　者：孙鹏[1] 程涵[1] 陈晨[1] 陈卫华[1] 

机构地区：[1]中国民航飞行学院,四川广汉618307

出　　处：《计算机仿真》2017年第5期76-81,共6页Computer Simulation

基　　金：国家自然科学基金(11602293)

摘　　要：侧风对降落伞工作性能有着较大影响。为了研究侧风对降落伞工作过程的影响程度,以C9伞作为研究对象,采用基于拉格朗日描述的有限元网格离散流场和结构场。因此两者材料间的耦合计算可以转化为基于罚函数的接触计算。同时为了减小计算量,采用图形变形方法使计算域始终随伞载系统的运动而运动,而风场速度作为边界条件施加在流场有限元边界网格上,风场边界条件不随流场域的位移而改变。将计算结果与空投试验结果进行对比发现二者基本一致,验证了上述计算方法的可行性,为降落伞的设计提供参考依据。Lateral wind has great influence on working performance of parachute. In order to study the influence of lateral wind on parachute working process, C9 parachute was used as the research object in this paper, the structure and flow field were discretized by finite element meshes which was described by Lagrangian. Therefore, the coupling calculation between the two materials was transformed into the contact calculation based on penalty function. In order to reduce the calculating work, the method of graphic distortion was used to make calculation domain always move with the movement of the parachute system, The velocity of wind field was applied on the finite element boundary me- shes of the flow field as the boundary condition. The boundary conditions of wind were not changed with the displace- ment of the flow field. The calculation results and the test results were compared and found that both were basically consistent, the feasibility of the calculation method was verified in this paper and this method also provided a refer- ence of design of parachute.

关 键 词：流固耦合 侧风 有限元法 降落伞 

分 类 号：V244.21[航空宇航科学与技术—飞行器设计]