中文摘要：

中国散裂中子源是我国重要的科学装置，退耦合液氢慢化器是其内部重要部件，对其进行计算和分析有着重要的意义。通过编译相应的UDF程序对ANSYSFLUENT软件进行二次开发，得到了复杂热源下退耦合液氢慢化器的仿真计算结果。计算更符实际的不均匀复杂热源，得到了不均匀的温度分布结果，温度峰值集中在容器底部一角。利用熵产理论对慢化工质进行热力学分析，得到流动熵产率和传热熵产率分布，其峰值主要集中在入氢管出口处的较小区域。同时计算了z轴不同高度上熵产率的平均值，得到了平均熵产率沿着z轴的分布规律。

英文摘要：

The Chinese Spallation Neutron Source （CSNS） is the important national scientific equipment. Inside the CSNS, the Decoupled Poisoned Hydrogen Moderator （DPHM） is one of the significant components. Thus the calculation and analysis of DPHM are of great meaning. The simulation results of DPHM with the complex non-uniform heat source were obtained by compiling relevant UDF program on ANSYS FLUENT software. The temperature distribution showed that the peak of temperature limited in a corner of the bottom of the container. By the analysis of entropy generation of liquid hydrogen, the distribution flow entropy production rate and heat transfer entropy generation rate were calculated. The peak of flow entropy production rate and heat transfer entropy generation rate is shown in a small area of the outlet of inlet-pipe of hydrogen. The averages of entropy production rate of z axis were also calculated and the distribution along the z axis was obtained.