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对以液氮为工质的低温贮箱进行了增压实验,气枕压力分别从常压增压至1.93bar、1.53bar、1.21bar,由于实验过程中液位的变化影响,增压速率依次略有下降。建立了贮箱增压数值模型,对1.93bar增压过程进行了模拟分析并与实验值进行了对比。对三组增压实验过程中液氮表面的温度分层情况进行了研究,结果表明液相温度分层主要存在于液氮表面,并且温度分层情况受气枕压力的影响明显,液相主流温度区几乎不随气枕压力变化。
The liquid nitrogen nitrogen as the working fluid in the cryogenic tank was pressurized test pillow pressure were pressurized from atmospheric pressure to 1.93bar, 1.53bar, 1.21bar, due to changes in the liquid level during the experiment, the supercharging rate in turn Slight decline. A numerical model of tank pressurization was established. The pressurization process at 1.93 bar was simulated and compared with the experimental data. The temperature stratification of the surface of liquid nitrogen in the three sets of pressurization experiments was studied. The results show that the liquid temperature stratification mainly exists on the surface of liquid nitrogen, and the temperature stratification is affected by the pressure of the air pillow. The main liquid temperature Area almost does not change with the pressure of the pillow.