摇摆运动下单相自然循环流动特点

Characteristics of Single-Phase Natural Circulation under Rolling

针对摇摆工况下单相自然循环流动的特点进行实验研究。实验结果表明,流体在摇摆作用下产生波动；波动频率与摇摆频率一致。理论分析表明,摇摆对自然循环的影响主要有两个方面,一方面摇摆引起回路空间位置的改变导致自然循环驱动压头发生变化；另一方面,摇摆引起的附加加速度使回路产生附加压降。通过建立简化模型,得出了摇摆周期、摇摆振幅和其他参数对单相自然循环流动影响的规律。

In the view of the characteristics of the single-phase natural circulation flow under rolling motion, the research was conducted experimentally. The result showed that the fluid fluctuated under rolling motion, and the frequency of the fluctuation was the same as the rolling frequency. The theoretical analysis showed that the rolling influenced the natural circulation in two aspects, i.e., on one hand rolling motion changed the system position and then changed the natural circulation thermal driven head; on the other hand the additional acceleration by the rolling imposed an additional pressure drop on the fluid. A model of the single phase natural circulation flow under rolling condition was constructed. The effects of rolling period, rolling amplitude and other parameters upon the natural circulation were analyzed and the influence rules were obtained.