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首页> 外文期刊>Annals of the New York Academy of Sciences >A Microgravity Experiment of the On-Orbit Fluid Transfer Technique Using Swirl Flow
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A Microgravity Experiment of the On-Orbit Fluid Transfer Technique Using Swirl Flow

机译:使用旋流的在轨流体传输技术的微重力实验

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摘要

The cryogenic fluid transfer technique will prove useful for flexible and low-cost space activities by prolonging the life cycle of satellites, orbital transfer vehicles, and orbital telescopes that employ cryogenic fluids, such as reactants, coolants, and propellants. Although NASA has conducted extensive research on this technique to date, a complicated mechanism is required to control the pressure in the receiver tank and avoid a large liquid loss by vaporization. We have proposed a novel fluid transfer method by using swirl flow combined with vapor condensation facilitated by spray cooling. This technique enables gas-liquid separation in microgravity and effectively facilitates vapor condensation without any special device like a mixer. In addition, since the incoming liquid flows along the tank wall, the tank wall would be cooled effectively, thereby minimizing the liquid loss due to vaporization. In this paper, the influence of the number of inlet points, fluid velocity at the inlet, fluid type, and boiling condition on swirl flow under microgravity conditions is investigated experimentally. The results indicated that the new fluid transfer technique using the swirl flow proposed by us is effective for cryogenic fluids that generally exhibit low surface tension and good wettability. In addition, it is possible to apply this technique to the real system because the swirl flow conditions are determined by the Froude number, which is dimensionless. Thus, the fundamental technique of fluid transfer by using the swirl flow under microgravity conditions was established.
机译:低温流体传输技术将通过延长使用低温流体(例如反应物,冷却剂和推进剂)的卫星,轨道传输飞行器和轨道望远镜的寿命周期,被证明对灵活且低成本的太空活动很有用。迄今为止,尽管NASA对该技术进行了广泛的研究,但仍需要复杂的机制来控制储液罐中的压力并避免由于蒸发而造成的大量液体损失。我们已经提出了一种新颖的流体转移方法,该方法利用涡流结合喷雾冷却促进的蒸汽凝结。此技术无需任何特殊设备(如混合器)即可实现微重力下的气液分离,并有效促进蒸汽冷凝。另外,由于进入的液体沿着罐壁流动,所以罐壁将被有效地冷却,从而使由于汽化引起的液体损失最小。本文通过实验研究了微重力条件下入口点数量,入口处的流速,流体类型和沸腾条件对旋流的影响。结果表明,我们提出的利用旋流的新流体传输技术对于通常表现出低表面张力和良好润湿性的低温流体是有效的。另外,由于旋流条件由无量纲的弗洛德数决定,因此可以将这种技术应用于实际系统。因此,建立了在微重力条件下利用旋流进行流体输送的基本技术。

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