反应堆冷却剂系统主管道流场分析

Analysis on Piping Flow Field of Reactor Coolant System

摘要: 针对流量计等测控仪表的布置及波动管等其他管道接口对主管道流场扰动的问题，考虑到流场不稳定性对仪表测量精度会有影响，为了判断接口位置是否合适，采用商用流场分析CFD软件ANSYS 14.5模拟计算了反应堆冷却剂系统其中一个环路主管道热管段的三维流场，不考虑传热模型的情况，得到了在系统运行参数下主管道热管段的速度场和压力场，结果表明在管道弯头处存在较大的速度梯度和压降，相关分析结果为仪控、热工水力设计等提供参考及优化建议。

Abstract: Aiming at the problem that the arrangement of flow-meter or surge pipeline would disturb the flow field of the coolant loop, and considering that the instability of the flow field would influence the measurement accuracy, in order to estimate whether the nozzle’s position is appropriate or not, the CFD software ANSYS 14.5 is adopted to simulate and calculate the hotleg’s three-dimensional flow field of Reactor Coolant System. Without regard to the heat transfer model, velocity and pressure distribution under the operation situation are gained. The results show that there exist large velocity gradient and pressure drop at the elbow of the pipe. Relevant analysis results may offer reference and optimization advice.