Study on Reverse Flow in U-Tube Steam Generator under Natural Circulations
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摘要: 在自然循环低流量工况下,会有部分U型管内流体处于倒流状态,等效增加蒸汽发生器的阻力系数,使得回路自然循环流量低于不考虑倒流时的理论预测值。本文从一维动量方程出发,分析U型管内流体稳定正向流动的限制条件,在此基础上,结合蒸汽发生器U型管和回路的质量、能量方程,分析自然循环回路内流体处于稳定流动状态时倒流份额的范围,并探讨回路局部阻力系数和U型管数目对倒流份额的影响。结果表明,回路局部阻力系数和U型管数目的减小均有助于减小倒流份额。Abstract: Some U-tubes are with flow in the reverse direction under natural circulations, which increases the equivalent local resistance of steam generator and decreases the flow of loop compared to the prediction without considering reverse flow. The stability of flow in a U-tube is discussed based on one-dimension momentum equation in this paper. On this basis, the range of the fraction of U-tubes with reverse flow can be derived from the conservation equations. The effect of loop resistance coefficient and numbers of U-tubes on the fraction of U-tubes with reverse flow is also discussed in this paper. The results show that the decreasing of the loop resistance coefficient and number of U-tubes contributes to decrease the fraction of U-tubes with reverse flow.
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Key words:
- Reverse flow /
- Steam generator /
- Natural circulation
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