Investigation on Single Phase Water Reverse Flow in Inverted U-Tubes of Steam Generator under Condition of Natural Circulation
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摘要: 利用RELAP5/MOD3.3程序对某压水堆单相流体自然循环工况进行建模计算,给出了典型自然循环工况下蒸汽发生器(SG)倒U型传热管内正流和倒流的流量分布,分析了产生倒流现象的原因以及发生倒流的条件及判断依据。结果表明:SG倒U型管发生倒流的条件是SG出口腔压力高于入口腔压力;传热管内流体的提升压头不足以克服流动阻力压降。对于本文描述的核动力装置,在强迫循环转自然循环过程中,如果SG水位保持正常,则较短的倒U型传热管流量下滑更快且最终发生倒流。倒U型管内倒流流体温度分布均匀,与SG二次侧温度基本相同。
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关键词:
- 蒸汽发生器 /
- 自然循环 /
- 倒流 /
- RELAP5/MOD3.3
Abstract: Using the code RELAP5/MOD3.3 to model and calculate the natural circulation of single-phase flow for the PWR,this paper provides the distribution of forward flow and reverse flow in the inverted U-tubes of the steam generator（SG） under some typical operating conditions in the natural circulation case,and analyzes the cause,occurrence condition and judgment principle of reverse flow phenomenon.The calculation results show that the occurrence conditions for reverse flow phenomenon are that the steam generator outlet pressure is higher than the inlet pressure and gravitational pressure drop is lower than the total of frictional pressure drop and area change pressure drop.As to the nuclear power plant described in this paper,if the water level of steam generator keeps normal,the mass flux of the shorter U-tubes will drop more quickly and reverse flow will occur.The temperature distributes uniformly in U-tubes with reverse flow and it is almost identical with that of SG in secondary side.-
Key words:
- Steam generator /
- Natural circulation /
- Reverse flow /
- RELAP5/MOD3.3
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