降落伞的流场特性研究

降落伞的流场特性直接关系到降落伞的气动力性能,一直以来是降落伞研究中的核心问题。本文采用计算流体动力学(CFD)方法对降落伞的流场进行数值模拟。通过采用不同的网格生成方法对降落伞的绕流流场进行研究,表明生成网格质量对流场计算精度有很大的影响。在一系列数值实验的基础上,证明采用多块贴体坐标的网格处理方法能够获得良好的网格质量,同时还具有易于寻找伞衣内外面压力,计算稳定性、可靠性高等优点。在此基础上,采用了七孔探针对降落伞绕流流场进行了测量,实验结果和计算结果吻合较好。

Investigation on the characteristics of parachute flow-field

The flow-field characteristics around a parachute are heavy related to its aero-dynamical performance and its investigation is the key problem in the research of parachute.The flow-field of the parachute is simulated by computational fluid dynamics(CFD) in this paper and the differential mesh generation method is adopted.The mesh quality affects the numerical calculation results of parachute flow-field.Numerical results of the full of parachute shows that multiple block body-fitted grid generation method has a series of advantages such as good mesh quality,easy to obtain the pressure inside and outside of the canopy,the high calculation stability and reliability.The real flow-field characteristics are measured using seven-hole probe.The calculation result is good consistent with the experimental datum.