摘要
通过计算流体动力学分析方法,分析了3种不同矢径比环形降落伞下降过程中的空气阻力及周边流场分布情况。计算结果表明,随着矢径比的增大,结构的整体阻力系数增加,当矢径比大于1时阻力系数增加效率降低;降落伞下降过程中,内表面形成稳定正压区,外表面大部分区域为负风压,顶部的外表面风压系数变化较大且可能为正压;随着矢径比的增大,流体在结构表面的流线更加平滑,降落伞下降的稳定性增加。
The drag coefficients and flow filed around falling annular parachute with different rise-radius ratio were studied by employing Computational Fluid Dynamics( CFD). The results show that the drag increase with the increasing rise-radius ratio and the lower increasing efficiency at the range of rise-radius ratio larger than 1. The stable positive wind pressure on inner surface was formed as well as most of the outer surface pressure was negative on most region; the pressure on the top of the outer surface fluctuates violently and probably is positive at case of large rise-radius ratio. The smoother stream line around the parachute with larger rise-radius ration will lead to the stable falling.
出处
《南阳理工学院学报》
2014年第3期102-104,共3页
Journal of Nanyang Institute of Technology
基金
大学生创新创业训练计划项目资助(201210107008)
