Abstract

A subchannel void sensor (SCVS) acquires the two-phase flow in a rod bundle as the time-series data of cross-sectional distributions. Herein, the temperature and pressure ranges of an SCVS were extended to include the rated conditions of boiling water reactors. The improved SCVSs were installed in a 5 × 5 heated rod bundle at eight height levels. In a boiling experiment using the rod bundle, the three-dimensional distributions of the boiling two-phase flow were measured over a wide pressure range (up to 7.2 MPa). The new experimental data were compared with existing experimental data and the results of a subchannel analysis. Experimental results were consistent with those of a high-energy X-ray computed tomography study of a heated rod bundle with the same geometry and under the same heat and flow conditions as those used in our study. The subchannel analysis code reproduced the experimental results fairly well, and the obtained database is applicable for validating and improving thermal-hydraulic analysis codes.

摘要

子通道空隙传感器 (SCVS) 获取棒束中的两相流作为横截面分布的时间序列数据。在此，SCVS 的温度和压力范围扩大到包括沸水反应堆的额定条件。改进的 SCVS 安装在 8 个高度的 5 × 5 加热棒束中。在使用棒束的沸腾实验中，在很宽的压力范围（高达 7.2 MPa）内测量了沸腾两相流的三维分布。将新的实验数据与现有的实验数据和子信道分析的结果进行了比较。实验结果与高能 X 射线计算机断层扫描研究的结果一致，该研究对具有与我们研究中使用的相同几何形状和相同热量和流动条件的加热棒束进行了研究。