Verification and Analysis of Fine Subchannel Rod Bowing Model
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摘要: 为提高子通道程序在棒弯曲情况下对子通道局部参数变化的预测能力，本研究在对子通道进行精细划分的基础上，建立了精细化子通道棒弯曲模型对棒弯曲进行分析，并利用计算流体动力学（CFD）来验证精细化子通道棒弯曲模型对子通道轴流和横流的预测能力。通过CFD对模型进行验证，分析了棒弯曲段轴流和横流的变化趋势。结果表明，程序ATHAS和CFD对轴流和横流的变化趋势预测基本一致，精细化子通道棒弯曲模型可以较好地预测棒弯曲引起的轴流和横流的变化趋势。因此，精细化子通道棒弯曲模型可以预测弯曲棒对局部流场的影响，为临界热流密度的预测提供了基础。Abstract: In order to improve the prediction ability of the sub-channel code for the local parameter changes under rod-bowing condition, a fined sub-channel rod-bowing model was developed in this study. The model, based on a detailed division of the sub-channels, allows a comprehensive analysis of rod bowing. The prediction ability of the fined sub-channel rod-bowing model on the axial flow and cross flow of the sub-channel was validated by computational fluid dynamics (CFD). Based on the validity of the model by CFD, the analysis of the trends of axial and transverse flows in the rod-bowing section was conducted. The results show that the predictions of the changing trends of axial flow and cross flow by ATHAS and CFD are basically consistent, and the fined sub-channel rod bowing model can better predict the changing trend of axial flow and cross flow caused by rod bowing. Therefore, the fined sub-channel rod bowing model can predict the influence of bowing rod on local flow field, which provides a basis for the prediction of critical heat flux.
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Key words:
- Fine sub-channels /
- Rod bowing /
- Distributed resistance model
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图 6 一般子通道和精细化子通道划分及间隙划分
Figure 6. General Sub-channels and Fined Sub-channels Division and Gap Division
图 8 棒弯曲及搅混翼对横流作用方向
Figure 8. Action Direction of Rod Bowing and Mixing Wings on Cross Flow
图 9 不同子通道之间轴流对比分析
Figure 9. Comparative Analysis of Axial Flow between Different Sub-channels
图 10 不同间隙之间的横流对比分析
Figure 10. Comparative Analysis of Cross Flow between Different Gaps
表 1 弯曲棒束几何参数
Table 1. Geometric Parameters of Bowing Rod Bundle
类型 参数值 燃料棒数目 25 燃料棒直径/mm 9.5 棒栅距/mm 12.6 棒到壁面距离/mm 2.5 通道流通面积/mm2 2440 加热长度/mm 3658 加热起始点/mm 500 棒束总长度/mm 4800 含搅混翼格架数目 7 含搅混翼格架轴向位置/mm 971、1425、1878、2332、
2785、3239、3747无搅混翼格架数目 2 无搅混翼格架轴向位置/mm 502.5、4255 简单支撑格架数目 8 简单支撑格架轴向位置/mm 737、1198、1651、2105、2559、3012、3493、4001 
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