| Citation: | HE Hong, ZHU Huajian, SHEN Zhipeng, et al. High-altitude floating mechanism and vertical trajectory simulation of double-layer latex balloon[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(12): 2650-2656. doi: 10.13700/j.bh.1001-5965.2020.0505(in Chinese)
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The double-layer latex balloon overcomes the shortcomings of the single-layer latex balloon and can float at high altitude with long time to achieve continuous meteorological observation. However, its high-altitude floating mechanism influenced by multiple factors is much more complicated. In particular, the determination of the Amount of Hydrogen (AoH) needed mainly depends on engineering experience currently, resulting in a high probability of failure, so it is urgent to study the theory behind phenomenon. The test data prove that the balance of buoyancy and gravity is a necessary condition for the double-layer latex balloon to achieve high-altitude floating. The influences of the AoH in inner and outer balloon, and diurnal temperature variation on the motion of the balloon were derived. The geometric model and the dynamic model of the double-layer latex balloon were established. Combined with the test data of balloon release process, the trajectories during ascent and horizontal floating process were simulated. The influence of the AoH on the floating altitude was explored, and it is proved that the AoH in inner balloon is the key factor that determines the floating altitude, and is affected by the diurnal temperature variation. When the operating load is about 1 kg and the inner and outer balloon specifications are set to 750 g and 500 g respectively, the ultimate horizontal floating altitude will increase or decrease by around 5 km for every 0.04 kg weight change in pull force of inner balloon, while the AoH in outer balloon has no effect on its floating altitude.
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