倒U型管蒸汽发生器单相管间脉动现象影响参数研究

Research on Influencing Parameter of Oscillation Phenomenon among Single-phase Tubes of Inverted U-tube Steam Generator

本文给出了单相管间脉动起始点的判定准则,且通过实验方法研究了不同一次侧入口温度、二次侧流量及回路阻力系数下单相管间脉动的变化规律。结果表明,随一次侧入口温度的升高,脉动起始点流速会随之呈近乎线性增加;随二次侧流量的增加,脉动起始点流速变化不大,脉动周期变大;随回路阻力系数的增加,脉动起始点流速呈先减小后趋于稳定的趋势,且小的回路阻力系数主要影响脉动起始点流速,大的回路阻力系数主要影响流量的分配。此外,实验中发现局部阻力系数的空间分布对流量分配的影响差别不大。

The determination of the onset point of the oscillation was given in this paper.With experimental methods,the effects on the oscillation among single-phase tubes under different primary side inlet temperatures,secondary side flow rates and loop resistance coefficients were studied.The results show that as the primary side inlet temperature increases,the flow velocity at the onset point of the oscillation almost increases linearly.With the increase of the secondary side flow rate,the flow velocity at the onset point of the oscillation is almost constant.As the resistance coefficient increases,the flow velocity at the onset point of the oscillation first decreases and then tends to be stable.The small resistance coefficient mainly affects the flow velocity at the oscillation onset point,while the large resistance coefficient mainly affects the flow distribution.Additionally,it is found that the effects of the distribution of local resistance of the loop on flow distribution are negligible.