基于RELAP5程序的直管式直流蒸汽发生器敏感性分析
Sensitivity Analysis of Once-Through Steam Generator Based on RELAP5 Code
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摘要: 直流蒸汽发生器内二回路侧的工质水经历了复杂的相变过程，流型转变和传热情况比自然循环式蒸汽发生器要复杂。本文以B&W公司的19管直管式直流蒸汽发生器实验装置为研究对象，采用最佳估算程序RELAP5/MOD3.4对其进行建模分析，研究了节点划分个数、计算时间步长、不同算法和分析方法对计算结果的影响，研究了系统程序RELAP5在分析存在有剧烈相变问题时需注意的不确定性因素。结果表明：应适当增加控制体的划分个数、降低计算时间步长；注意两相流模型的选择使用；注意两种算法的使用场合；同时应选择多通道的分析方法。
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关键词:
- 直流蒸汽发生器 ,
- RELAP5/MOD3.4程序 ,
- 相变
Abstract: The water of the once-through steam generator secondary side goes through complicated phase change processes, and the flow types and heat transfer cases are much more complex than that of the natural circulation steam generator used in pressurized water reactor. The straight pipe type once-through steam generator experiment equipment of B&W Company was studied in the paper. The best estimated code RELAP5/MOD3.4 was chosen, and the influences of the node number, calculation time step, arithmetic, and the analysis method were studied in detail. The uncertainty factors that should be careful attention during the research on the great phase change were described. The results show that the number of the control volume increases; the calculation time step decreases; the two-phase model is adopt properly based on problem type; the using condition of the different arithmetics is ascertain; the multi-channel analysis method is selected accordingly.-
Keywords:
- once-through steam generator ,
- RELAP5/MOD3.4 code ,
- phase change
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