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| Heat Dissipation Simulation of Tethered Aerostat Windscreen |
| Received:March 16, 2020 Revised:May 20, 2020 |
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| DOI：10.7643/issn.1672-9242.2020.12.002 |
| KeyWord:tethered aerostat windscreen heat dissipation numerical simulation two-way coupling |
| Author | Institution |
| JIANG Peng-cheng |
China Special Vehicle Research Institute, Jingmen , China |
| OUYANG Zi-qiang |
China Special Vehicle Research Institute, Jingmen , China |
| ZHANG Wen-hua |
China Special Vehicle Research Institute, Jingmen , China |
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| Abstract: |
| The work aims to solve the problem in the heat dissipation design of tethered aerostat windscreen. Through the establishment of three-dimensional geometry and discrete model, FLUENT was used to carry out thermal flow numerical simulation calculation, and combined with UDF to simultaneously realize the real-time coupling calculation (two-way coupling) of the external convection, external solar radiation and internal convection, internal infrared radiation and internal heat source of the windscreen. The most severe environment (wind speed, temperature and solar radiation) was selected to analyze the tethered aerostat windscreen at a height of 3000 m and 6000 m. After the analysis according to the most severe state, the external air was introduced into the windscreen for forced ventilation and convection at a working height of 3000 m and 6000 m to ensure the requirements of the working environment of the task equipment. After the lift-off, due to the decrease of the ambient temperature, the heat dissipation of the windscreen increased, and the external ventilation required for the heat dissipation of the task equipment (radar) decreased. At the working condition of 3000 m-3 m/s ,when the mass flow at the inlet of the windscreen was 1.0 kg/s, the temperature inside the windscreen was 39~40 ℃. At the condition of 6000 m-3 m/s, when the mass flow at the inlet of the windscreen was 0.5 kg/s, the temperature inside the windscreen was 25.5~26 ℃. The forced ventilation air inlet on the windscreen was arranged under the heating parts of the task equipment, and the special exhaust port was arranged at the upper part and the rear part of the windscreen to ensure the air circulation inside the windscreen. The two-way coupling calculation method can quickly obtain the heat dissipation details of the tethered aerostat windscreen under various conditions, and provide detailed design basis for the heat dissipation design of the windscreen and the thermal design of the internal task equipment. Compared with the engineering estimation and one-way coupling, it is closer to the actual state and has higher calculation accuracy. The two-way coupling calculation method and simulation data can provide reference for the heat dissipation design of the same type of tethered aerostat windscreen. |
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