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液氢输送问题的讨论分二个课题:一是常温容器加注液氢的冷却特性,二是输送方式。一、常程容器加注液氢的冷却特性概论当液氢进入常温管路时会形成一个液相前锋区。进入管路的液氢被沸腾汽化形成气体的反压滞止以前,会向前流动一个相当长的距离。由于输送初始阶段液氢剧烈汽化和压力波动,致使液氢大面积湿润输送管壁,此时形成的氢气总量通常会超出管路的排放能力,从而会导致液氢倒流。在初始压力波动和液体倒流之后,会接着产生下一个较小数量级的压力波动和液体倒流,波动会逐渐减小直到出现稳定的流动。压力波动的频率F可用下式估算:
The discussion of liquid hydrogen transport is divided into two topics: First, the cooling properties of liquid container filled with liquid hydrogen, the second is the delivery method. First, the routine container filling liquid cooling characteristics of hydrogen Introduction Liquid hydrogen into the room temperature when the pipeline will form a liquid front area. The liquid hydrogen entering the pipe is boiled and boiled to form a gas back-pressure stagnation, will flow forward a considerable distance. Due to the intense vaporization and pressure fluctuation of the liquid hydrogen in the initial stage of transportation, the large area of the liquid hydrogen is wetted to transport the pipe wall. At this moment, the total amount of hydrogen formed usually exceeds the discharge capacity of the pipeline, thereby causing liquid hydrogen to flow backwards. After the initial pressure fluctuations and liquid backflow, the next smaller order of magnitude of pressure fluctuations and liquid backflow will occur, and the fluctuations will gradually decrease until a steady flow occurs. The frequency of pressure fluctuations, F, can be estimated as: