Nonuniform steam generator U-tube flow distribution during natural circulation tests in ROSA-IV large scale test facility
Nonuniform steam generator U-tube flow distribution during natural circulation tests in ROSA-IV large scale test facility
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DOI：
10.13182/nse99-289
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发表时间：
1988-08
影响因子：
1.2
通讯作者：
Y. Kukita;H. Nakamura;K. Tasaka;C. Chauliac
中科院分区：
文献类型：
--
作者：
Y. Kukita;H. Nakamura;K. Tasaka;C. Chauliac
自然循环实验在西屋型压水堆大型（1/48体积）全高模拟器中进行。该设施有两台蒸汽发生器，每台蒸汽发生器均包含 141 根 9 种不同高度的全尺寸 U 型管。实验中观察到随着侧质量库存的初级减少，自然循环模式发生转变。观察到三种主要的循环模式：单相液体自然循环、两相自然循环和回流冷凝。对于所有这些循环模式，以及在模式之间的转换期间，蒸汽发生器 U 形管之间的质量流量分布明显不均匀。较长的 U 形管表明在较高的一次侧质量库存时出现反向流动，并且当一次侧质量库存减少时也往往比较短的 U 形管更早排空。
Natural circulation experiments were conducted in a large-scale (1/48 scale in volume) full-height simulator of a Westinghouse-type pressurized water reactor. This facility has two steam generators each containing 141 full-size U-tubes of 9 different heights. Transition of the natural circulation mode was observed in the experiments as the primary of side mass inventory was decreased. Three major circulation modes were observed: single-phase liquid natural circulation, two-phase natural circulation, and reflux condensation. For all these circulation modes, and during the transitions between the modes, the mass flow distribution among the steam generator U-tubes was significantly nonuniform. The longer U-tubes indicated reversed flow at higher primary side mass inventories and also tended to empty earlier than the shorter U-tubes when the primary side mass inventory was decreased.