基于漂移流模型的蒸汽发生器稳态热工水力分析

摘要

In order to study the steady thermal‐hydraulic characteristics of a steam gen‐erator ,a 1D simulation code based on the 4‐equation drift flux model was developed . The U tube bundle space was considered to consist of the primary channel ,the seconda‐ry channel and the tube wall .The flowing characteristics in sub‐cooling part of the pri‐mary and secondary channels were simulated with single phase flow model ,while the boiling part in the secondary channel was simulated with 4‐equation drift flux model . The first‐ordered upwind differencing equations were derived based on the staggered grid .An alternate iteration method of heat balance and driving force of natural circula‐tion was implemented then . By the proposed method , the steady thermal‐hydraulic characteristics for steam generator of Qinshan 300 MW NPP ,under 100% ,75% ,50% , 30% ,15% power condition , were analyzed and compared with simulated results of RELAP5 .Two sets of results are in good agreement .%为研究蒸汽发生器的稳态热工水力特性，建立了四方程漂移流模型，并开发了一维计算程序。对蒸汽发生器U型管管束空间考虑为由一次侧通道、二次侧通道和传热管构成，对一次侧通道和二次侧通道的过冷段采用单相流模型，二次侧通道的沸腾段采用四方程漂移流模型，建立基于交错网格的一阶迎风差分方程，通过热平衡‐自然循环压降的交叉迭代计算得到稳态热工水力参数。利用程序计算了秦山300 M W核电厂100％、75％、50％、30％、15％功率稳定运行工况下的热工水力特性，并与REL A P5的计算结果进行比较，两组结果一致性较好。