基于ANSYS CFX的超超临界锅炉给水泵三维流场仿真

Three-dimensional Flow Field Simulation of Ultra-supercritical Boiler Feed Water Pump Based on ANSYS CFX

建立了一台火电机组超超临界锅炉给水泵的整机全流场模型,应用ANSYS CFX软件对其进行三维定常湍流计算,获得了给水泵关键零部件内流场的压力、速度分布情况。根据流场结果对叶轮、导叶的细节流动现象进行深入解析,确定了给水泵水力设计的合理性,并通过相关计算预测了水泵的流量-扬程、流量-效率曲线。经过与实测试验数据对比表明,仿真模拟结果趋势完全正确,且吻合程度良好,说明CFD技术能有效应用于电站锅炉给水泵的工程设计及优化,并为后续工作提供定性指导。

The whole flow passage model of a coal-fired ultra-supercritical boiler feed water pump is built. The three-dimensional steady turbulent flow calculation through the model is completed based on the software ANSYS CFX. The pressure and velocity distributions within the pump＇s key parts are obtained. According to the calculation results, the detailed flow phenomena for impellers and guidevanes are deeply studied. The reasonability of the pump＇s hydraulic design is confirmed. Also, the flow-head, flow-efficiency curves of the pump are predicted through the numerical results. By comparison with the actual testing data, it shows that the numerical simulation results have a correct tendency and are in good agreement with the testing values. This indicates the CFD technology could be well applied for engineering design and optimization of the boiler feed pump in power station and provide a guidance for further research qualitatively.