叶轮叶片厚度对混流式核主泵能量性能的影响

为了分析混流式核主泵叶轮叶片厚度对能量性能的影响和进行流体动力优化，以某公司制造的100型混流式核主泵为研究对象，选取叶轮叶片厚度作为优化设计变量，分别设计了3种不同叶片厚度的叶轮。首先对原始模型进行数值模拟及性能预测，通过与原始模型试验数据的对比分析，确定了合理的数值模拟方法和验证性能预测的可靠性。对3种不同叶片厚度的叶轮进行全流道的数值计算分析，预测分析不同叶片厚度对核主泵外特性以及内部流场分布的影响。分析结果表明:相同流量工况下，随着叶轮叶片厚度的减薄，核主泵的扬程增加，效率降低。由于空间导叶的特殊结构，叶轮叶片减薄使导叶叶片进口处出现回流现象，增加了导叶内的流动损失，且全流道内的压力整体较高。因此，适当地增加叶片厚度有助于提高具有特殊空间导叶结构的核主泵效率和保证核主泵运行的可靠性。 

Effect of Different Blade Thickness of Impellers on Energy Performance of Mixed-Flow Reactor Coolant Pump

In order to analyze the effect of blade thickness of impeller on the energy performances and optimize the hydrodynamic performance in the mixed-flow reactor coolant pump (RCP), the 100 type mixed-flow RCP is taken as the research object. Three impellers with different blade thicknesses were designed by choosing the thickness of impeller blade as the optimization design variable. The numerical simulation and performance prediction of the original model are carried out firstly. By comparing with the experimental data of the original model, the reasonable numerical simulation method and the reliability of the performance prediction are determined. Through the whole passage's numerical calculation and analysis of three impellers with different blade thicknesses, the effect of different blade thicknesses on the external characteristics and internal flow field distribution of RCP is predicted and analyzed. The results showed that the head of RCP increases and the efficiency decreases with the decreasing of the thickness of impeller blade under the same flow condition. Because of the special structure of the space guide vane, the decreasing of the impeller blade thickness causes reflux phenomenon at the inlet of the guide vane, which increases the flow loss in the guide vane, and the pressure in the whole flow path is overall higher. Therefore, properly increasing the blade thickness is helpful to improve the efficiency of RCP with special spatial guide vane structure and ensure the reliability of the operation of RCP.