RELAP5程序不同流体动力学模型计算直流蒸汽发生器比较研究

A Comparison Study of Once-Through Steam Generation Calculation with the Different Fluid Dynamic Models of the RELAP5 Code

摘要: 本文采用RELAP5程序的四种不同流体动力学模型计算了蒸汽产生过程的热工水力特性，比较了四种模型之间的差异，采用直流蒸汽发生器实验数据进行模型的准确性比较和分析，结果表明：四种模型计算一次侧单相液流动与换热过程的热工特性趋势一致、数值大小基本吻合；四种模型计算两相过热蒸汽产生过程趋势一致，但热工参数压力、温度、含汽率、热流密度的数值存在差异。通过与实验数据的对比和分析，为准确计算直流蒸汽发生器的瞬态过程，推荐优先选用非均匀、非平衡态模型，其次为均匀、非平衡态模型，不推荐采用均匀、平衡态模型或非均匀、平衡态模型。

Abstract: The thermal hydraulic characteristic of the once-through steam generation is calculated by using the four type fluid dynamic models of RELAP5 code. The results are compared with the experiment data. The results show that: the trends and calculated values of the primary single-phase flow pa-rameters are close to the experiment data. The thermal hydraulic trends of the superheated steam are similar, but the thermal parameter values, such as pressure, temperature, quality and heat flux, exist some differences. Based on the comparison with experiment data and analysis, to better calculate steam generation transient process and parameters, the first choice is nonhomogeneous and nonequilibrium model, and the second is the homogeneous and nonequilibrium model. The nonhomogeneous and equilibrium model, or the homogeneous and equilibrium model, are not recommended.