基于CFD的系留气球表面结冰研究
Research on Surface Icing of Tethered Balloon Based on CFD
蒋鹏程 1余莉2
作者信息
- 1. 南京航空航天大学,南京 211106;中国特种飞行器研究所,湖北 荆门 448035
- 2. 南京航空航天大学,南京 211106
- 折叠
摘要
目的 预测不同环境条件下系留气球的结冰部位与结冰量,为系留气球的安全运行提供参考依据.方法 利用气候试验室对柔性材料制成的试验件进行结冰研究,并与金属表面结冰进行对比分析,明确柔性材料的结冰机理.采用数值模拟的方法,对某型系留气球进行多参数多状态结冰研究,同时开展系留气球结冰后的稳定性分析.结果 保持一定刚度的柔性材料和金属材料结冰情况基本一致,结冰机理相同.计算得出了通常结冰、冻雾和冻雨条件下,各俯仰角下系留气球表面的结冰分布情况.通常结冰条件下,结冰主要发生在尾翼前缘,结冰量随风速和俯仰角增大而增大;在冻雾和冻雨条件下,结冰部位则出现在囊体和尾翼,结冰量随风速和俯仰角呈V形变化.结论 依据计算结果开展稳定性分析得出,系留气球在剩余浮力正常的情况下具备一定的"结冰容限",但长时间处于恶劣天气时仍需开展冰雪应对措施.
Abstract
The work aims to predict the icing parts and icing amount of tethered balloons under different environmental con-ditions,so as to provide a reference basis for safe operation of tethered balloons.The icing research was carried out on the test pieces made of flexible materials in the climate laboratory.The icing was compared and analyzed with that on metal surfaces,so as to clarify the icing mechanism of flexible materials.Numerical simulation was used to study the multi-parameter and multi-state icing of a certain type of tethered balloons.At the same time,the stability analysis of the tethered balloon after icing was carried out.The results showed that the icing situations of flexible and metallic materials with a certain degree of rigidity were basically the same,and the icing mechanisms were the same.The distribution of icing on the surface of the tethered bal-loon at each pitch angle under normal icing,freezing fog and freezing rain conditions was calculated.Under normal icing condi-tions,icing mainly occurred at the leading edge of the tail,and the amount of icing increased with the wind speed and pitch an-gle;while under freezing fog and freezing rain conditions,icing occurred at the capsule and the tail,and the amount of icing varied in a V-shape with the wind speed and pitch angle.According to the stability analysis based on the calculation results,the tethered balloon has a certain"icing tolerance"under normal remaining buoyancy,but it still needs to carry out ice and snow countermeasures when it is under severe weather for a long time.
关键词
系留气球/结冰/气候室试验/数值模拟/稳定性分析/结冰容限Key words
tethered balloon/icing/climate laboratory test/numerical simulation/stability analysis/icing tolerance引用本文复制引用
基金项目
航空联合基金(6141B05040203)
出版年
2024
NETL
NSTL
万方数据