控制棒驱动机构传热机理与隔热套性能研究

控制棒驱动机构(CRDM)依靠强制冷却措施维持工作温度。本文针对CRDM复杂的轴向传热机理,基于冷热侧流动的假设建立热虹吸自然对流分析模型,计算得到轴向温度分布及隔热套内径与热虹吸传热量之间的关系曲线;同时进行验证试验,测量不同情况下CRDM内外轴向温度分布和总散热量。通过分析和试验对比证明:基于假设的分析模型能模拟实际情况,热虹吸传质传热是CRDM轴向传热的主要途径,设置隔热套能有效抑制热虹吸、减少散热量。

Heat Transfer Mechanism and Thermal Sleeve Performance of Control Rod Drive Mechanism

The control rod drive mechanism (CRDM) relies on forced cooling measure to maintain its operating temperature. For the complex issue of CRDM heat transfer mechanism, the thermo-siphoning natural heat convection analysis model was established based on the hypothesis which divides coolant inside CRDM into hot side and cold side, meanwhile, the experiment to measure CRDM inside/outside temperature distribution and total heat dissipating capacity under different conditions was conducted. Through comparison of analysis results and experimental data, the analysis model based on hypothesis can correctly simulate CRDM heat transfer in real situation, the thermo siphoning heat and mass transfer is the major way of CRDM axial heat transfer, and the use of thermal sleeve can weaken thermo-siphoning and reduce heat dissipating capacity effectively.