【摘要】 以自然循环倒U型正三角形布置传热管蒸汽发生器为原型,建立蒸汽发生器一、二次侧及传热管"平均通道"模型,采用CFD技术,对蒸汽发生器一、二次侧共轭传热过程和二次侧两相流流动和沸腾换热过程进行研究。结果表明利用计算流体力学方法能精确模拟蒸汽发生器一次侧、传热管和二次侧的换热过程,得到一、二次侧流体温度、速度、汽化速率以及管壁温度的变化。蒸汽发生器直管段传热管管壁温度与一回路温度变化趋势一致,但弯管段传热管内外壁温差较大,顺流段一、二次侧流体温差明显高于逆流段;二次侧汽液两相流体滑速比呈先增大后减小且最终趋于稳定的趋势。更多还原

【Abstract】 Taking an equilateral triangle arranged inverted U-tube in natural circulation steam generator as the prototype,the"Average channel"model of SG including the primary side,secondary side and U-tube was built.the conjugate heat transfer between primary and secondary side,and the two-phase flow and heat transfer in SG secondary side were analyzed by computational fluid dynamics(CFD)technique.The results show that,it can simulate the phenomenon of the conjugate heat transfer and the two-phase flow in steam generator by computational fluid dynamics methods accurately,it can get the distribution of the temperature,velocity,vapor volume fraction in SG.The temperature tend in tubes was accord with the primary side in identical flow section,the temperature difference between the primary side and secondary side in identical flow section is higher than the temperature difference in reverse flow section.The slip ratio of liquid and steam in secondary side have the tendency of increasing first and then decreasing,but stables finally.更多还原