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Thermal performance analysis and comparison of stratospheric airships with rotatable and fixed photovoltaic array

机译：可旋转和固定光伏阵列平流层飞艇的热性能分析和比较

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The thermal performance of stratospheric airship is closely related to the superheat/overpressure of airship, the thermal stress of the hull, the mechanics property of the envelope, as well as the airship reliability and lifetime. A comprehensive understanding of the thermal performance of the airship is important for the increase of airship applications. For the improved airship with rotatable photovoltaic array, the location of the photovoltaic array changes with time to utilize the solar radiation maximally, which decrease the mass of photovoltaic array greatly. The thermal performance may be different with the traditional airship with fixed photovoltaic array. In this paper, a thermal model of stratospheric airship with rotatable photovoltaic array was proposed to investigate the thermal performance and compare with traditional stratospheric airship with fixed photovoltaic array. A user define function program in computational fluid dynamic software was developed based on the model. The temperature distribution of surface and flow field of inner lifting gas of the airship with rotatable/fixed photovoltaic array were simulated and compared. The result shows that the temperatures of photovoltaic array and envelope of the improved airship are slight higher than that of traditional airship. The temperature fields of the Helium are also various and the uneven temperature distribution leads to the formation of eddies and chaotic state of the flow field. It is helpful in guiding the design of novel stratospheric airship with low weight power system, especially the design of thermal control system and inner pressure regulation system of the airship.
机译：平流层飞艇的热性能与飞艇的过热/超压，船体的热应力，围护结构的力学性能以及飞艇的可靠性和寿命密切相关。全面了解飞艇的热性能对于增加飞艇应用至关重要。对于具有可旋转光伏阵列的改进型飞艇，光伏阵列的位置随时间变化以最大程度地利用太阳辐射，这大大降低了光伏阵列的质量。热性能可能与具有固定光伏阵列的传统飞艇不同。本文提出了具有可旋转光伏阵列的平流层飞艇的热模型，以研究其热性能，并将其与具有固定光伏阵列的传统平流层飞艇进行比较。基于该模型，开发了计算流体力学软件中的用户定义功能程序。模拟并比较了具有可旋转/固定式光伏阵列的飞艇的表面温度分布和内部提升气体的流场。结果表明，改进型飞艇的光伏阵列和包络线温度略高于传统飞艇。氦气的温度场也多种多样，温度分布不均会导致涡流的形成和流场的混沌状态。有助于指导新型低重量动力平流层飞艇的设计，特别是飞艇的热控制系统和内压调节系统的设计。

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