平流层浮空器的热数值分析

Thermal analysis of a stratospheric airship

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。

Thermal problems greatly affect the design and control of stratospheric airships. This paper presents a thermal analysis computational fluid dynamics （CFD） model for a stratospheric airship with only one ballonet. The temperature change of the ballonet during one day was simulated using the CFD model. The simulation gives a temperature change of about 44 K during one day, the flow inside the ballonet and the temperature distribution on the thin-gauge skin. The results show that the natural convection in the ballonet does not need to be included in the thermal analysis of the stratospheric airship so the heat transfer inside the ballonet can be treated as simply a heat conduction problem, a much simpler mathematical model for further research.