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为了分析核反应堆冷却剂系统中带热套管T型接管内由于注入非等温横向射流导致的构件热冲击状况,本文应用计算流体力学商用软件FLUENT5.3进行了紊流流动换热的数值模拟,分析了主管及接管与热套管间环腔内的流动换热特性。针对套管上开有通流小孔,并采用凸台支撑的热套管结构形式,模拟了射流与主流流速比为0.05及0.5两种典型工艺。通过传热实验,研究了主管及接管内壁近壁区域的传热特性,并讨论了热套管尺寸变化对接管热冲击的影响。结果表明,数值模拟与实验数据吻合良好;热套管对构件的热保护程度与热套管结构形式及流速比密切相关;适当减小流速比有利于改善构件热应力状况。
In order to analyze the component thermal shock caused by the non-isothermal transverse jet injected into the T-branch of the thermal reactor in the nuclear reactor coolant system, numerical simulation of turbulent flow heat transfer is carried out by using CFD commercial software FLUENT5.3 The flow and heat transfer characteristics between the supervisor and the receiver and the thermowell in the annulus. In view of the fact that the through-flow orifice is formed on the bushing and the bushing is used to support the thermowell structure, two typical processes of jet-to-main flow ratio of 0.05 and 0.5 are simulated. Through the heat transfer experiment, the heat transfer characteristics of the main pipe and the takeover wall near the inner wall were studied, and the influence of the change of the thermal pipe size on the thermal shock of the pipe was discussed. The results show that the numerical simulation is in good agreement with the experimental data. The thermal protection degree of the thermowell is closely related to the thermowell structure and flow rate ratio. Properly reducing the flow rate ratio is beneficial to improve the thermal stress of the structural component.