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| Research on Surface Icing of Tethered Balloon Based on CFD |
| Received:March 02, 2024 Revised:April 11, 2024 |
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| DOI：10.7643/issn.1672-9242.2024.07.013 |
| KeyWord:tethered balloon icing climate laboratory test numerical simulation stability analysis icing tolerance |
| Author | Institution |
| JIANG Pengcheng |
Nanjing University of Aeronautics and Astronautics, Nanjing , China;China Special Vehicle Research Institute, Hubei Jingmen, , China |
| YU Li |
Nanjing University of Aeronautics and Astronautics, Nanjing , China |
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| Abstract: |
| The work aims to predict the icing parts and icing amount of tethered balloons under different environmental conditions, 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 balloon at each pitch angle under normal icing, freezing fog and freezing rain conditions was calculated. Under normal icing conditions, icing mainly occurred at the leading edge of the tail, and the amount of icing increased with the wind speed and pitch angle; 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. |
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