钠冷快堆直流式蒸汽发生器固定网格与滑移网格模型对比分析
Analysis of Fixed and Movable Boundary Models for Once-through Steam Generator of Sodium-cooled Fast Reactor
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摘要: 根据钠冷快堆核电厂直流式蒸汽发生器（OTSG）的热工水力特性，基于固定网格模型和滑移网格模型编制了OTSG瞬态分析程序OTAC。对美国能源技术工程中心(ETEC)的OTSG停闭实验进行了模拟，并将计算值与实验值作了对比分析。结果发现，两种模型的计算值与实验值吻合较好，其中固定网格模型只有在网格数目足够多时才能避免计算结果的突跳，而滑移网格模型可在较少网格数目下取得很好的计算效果，提高了数值稳定性，避免了计算结果的不连续。Abstract: According to the thermal-hydraulic characteristics of once-through steam generator (OTSG) of sodium-cooled fast reactors, the OTSG transient analysis code OTAC was established based on the fixed and movable boundary models. The United States Energy Technology Engineering Center OTSG shutdown experiment was simulated by OTAC, and the calculated and experimental results were compared and analyzed. The calculated values of the two models are in good agreement with the experimental values. The step results can be avoided only in enough grids for the fixed boundary model. However, the numerical stability and the continuous calculation results can be improved based on less number of the grid for the movable boundary model.
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