棒束通道内温度场分布特性研究

可视化实验技术越来越多地被应用于核反应堆系统参数的测量，本文基于激光诱导荧光（LIF）技术的特点，介绍该技术的难点和解决方案，并对棒束通道定位格架下游稳态流和脉动流下温度分布进行了研究。结果显示，通过对系统光学特性和染色剂特性研究，可提高LIF技术的应用范围和测量精度。同时采用后处理技术，可获得更准确的温度场分布。通过对棒束通道定位格架下游全场温度进行测量，获得了稳态流和脉动流两种工况下温度的分布。定位格架能显著增强下游的流动搅混，提高换热能力。流速的波动也会对温度分布产生显著影响。研究表明，LIF技术可实现对棒束通道内流体温度分布的全场测量，根据温度分布特性研究可实现对定位格架性能的评价。

Temperature Field Distribution Characteristics in Rod Bundle Channel

Visualized experimental techniques are increasingly used in the measurement of nuclear reactor system parameters. Based on the characteristics of laser induced fluorescence (LIF) technique, the difficulties and solutions of the LIF technique were introduced in this paper. And the temperature distributions downstream of spacer grid in rod bundle channel under the steady flow and pulsating flow were analyzed. The results show that the application range and measurement accuracy of LIF technique can be improved by studying the optical properties and dye characteristics. At the same time, post-processing technology can be used to obtain more accurate temperature field distribution. The full-field temperature distributions downstream of spacer grid in rod bundle channel under steady flow and fluctuating flow conditions were obtained. Spacer grid can significantly enhance flow mixing and improve heat exchange capacity. Temperature distribution is also affected by fluctuations in velocity. In summary, the LIF technique can achieve the full-field measurement of the temperature distribution in the rod bundle channel. According to the temperature distribution characteristics, the performance of the spacer grid can be evaluated.