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首页> 外文期刊>Journal of Fluids and Structures >Dynamical stability analysis of a hose to the sky
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Dynamical stability analysis of a hose to the sky

机译：空中软管的动态稳定性分析

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The Stratospheric Shield was proposed as a geoengineering concept to control the Earth's climate and reverse global warming. This approach seeks to release sulphur dioxide (SO_2) aerosols in the stratosphere to decrease the amount of sunlight that reaches the surface of the Earth. It was proposed that this can be done by pumping liquefied SO_2 from the ground to the stratosphere in a 30 km long hose supported by aerostats. In this paper we evaluate the dynamic stability of a hose to the sky considering distributed supportive aerostats and an atomiser nozzle that forces a radial discharge of the fluid at the free end of the pipe. We modelled the pipe as a taut string conveying fluid using the finite element method. With a nozzle that discharges the flow straight through, we found that the pipe loses stability by buckling when the tension becomes null at least at one location along its length. This instability can be avoided by having a sufficient minimum tension To throughout the whole length of the pipe. The distribution of aerostats does not influence this instability but it modifies the mode shapes and affects the complex frequencies. The atomiser discharging the flow radially at the tip of the pipe has for effect to remove the possibility of an instability; its use is thus recommended. Moreover, we showed that the Coriolis damping can be significant and that by appropriately selecting the number of aerostats as well as the dimensionless flow velocity, stability can be increased. With this in mind, a functional hose to the sky could be designed to maximise Coriolis damping and thus passively damp the motion of the pipe due to forcing from the wind.
机译：提出了“平流层盾构”作为一种地球工程学概念，以控制地球的气候并逆转全球变暖。这种方法试图在平流层中释放二氧化硫（SO_2）气溶胶，以减少到达地球表面的阳光量。有人提出，可以通过在由浮空器支撑的30公里长的软管中将液化的SO_2从地面泵送到平流层来实现。在本文中，我们通过考虑分布式支撑浮空器和雾化器喷嘴来评估软管对天空的动态稳定性，雾化器喷嘴迫使流体在管道的自由端径向排放。我们使用有限元方法将管道建模为输送流体的拉紧管柱。通过喷嘴直接排出流体，我们发现，当至少在沿其长度的某个位置张力变为零时，管道会因屈曲而失去稳定性。通过在管的整个长度上具有足够的最小张力To，可以避免这种不稳定性。浮空器的分布不会影响这种不稳定性，但是会修改模式形状并影响复杂的频率。雾化器在管子的顶端沿径向排放流体，以消除不稳定的可能性。因此建议使用它。此外，我们证明了科里奥利阻尼非常重要，并且通过适当选择浮空器的数量以及无因次流速，可以提高稳定性。考虑到这一点，可以设计通向天空的功能性软管，以最大程度地提高科里奥利阻尼，从而由于风的作用而被动地阻尼管道的运动。

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