低温两相流垂直管内间歇泉现象的数值模拟研究

Numerical Investigation of Cryogenic Two-Phase Flow Geysering Phenomenon in Vertical Tube

摘要: 本文通过数值模拟方法对垂直管内间歇泉现象进行了研究。研究了不同工况下垂直管内间歇泉的变化规律。结果表明，弹状气泡由垂直管内进入上部存储罐时，破碎成为为团状气泡并向上方液面移动，在移动过程中团状气泡发生破碎，在溢出液面时发生液滴溅出，且液面高度发生周期性变化。当初始弹状气泡长度过小不会引发间歇泉现象。随着弹状气泡长度增大，间歇泉的强度赠大。当垂直管内存在多个弹状气泡时，随着管内弹状气泡的增多，压力波动的频率增大，压力值整体增大。

Abstract: The geysering phenomenon at different conditions in the vertical pipe is studied by CFD simulation. The results show that the slug bubble changes into the lump bubble and moves to the top level when it moves into the pool. When the bubble overflows the top level, the liquid droplet is splashed, and the liquid level changes periodically. The length characteristics of slug bubble are performed in cryogenic vertical geysering phenomenon. The geysering cannot be occurred when the length of slug bubble is too small. With the length of slug bubble is increased, the intensity of geysers is huger. The pressure frequency and intensity are increased when the number of Taylor bubble is increased.