论文部分内容阅读
平流层浮空器的热问题对于其设计和运行控制都有很重要的影响。该文建立了单气囊的浮空器热分析模型,给出了辐射外热流的模型和计算方法,利用CFD软件对气囊的昼夜温度波动进行了数值模拟。模拟结果给出了气囊内部温度的波动幅度(算例中的内部气体昼夜温差约为44K)、蒙皮的温度分布以及内部的流动状态。结果表明:在平流层浮空器的热分析中可以不用求解浮空器内部自然对流,而将其作为固体导热问题来处理,因而为进一步的研究提供了一个更为简化的数值分析模型。
The heat problem of stratospheric aerostat has a very important influence on its design and operation control. In this paper, a single-balloon aerostat analysis model is established. The models and calculation methods of radiative heat flux are given. The CFD software is used to simulate the temperature fluctuations of the airbag in daytime and in the nighttime. The simulation results show the temperature fluctuation inside the airbag (in the example, the temperature difference between day and night is about 44K), the temperature distribution of the skin and the internal flow. The results show that the thermal analysis of the stratospheric aerostat can be used to deal with the problem of solid thermal conductivity without solving the natural convection inside the aerostat, thus providing a more simplified numerical analysis model for further research.