轴流铅铋泵流场分析及优化

铅铋泵作为铅铋冷却快堆一回路的关键输送设备，其安全运行对铅铋冷却快堆的安全至关重要。液态铅铋合金在泵内流动特性对泵的长期安全运行有重要影响，为了研究轴流铅铋泵泵内流场，通过Workbench/BladeGen软件建立了主泵叶轮模型，在ANSYS CFX软件中数值模拟泵内流场，并根据数值模拟结果改进了导叶片厚度，优化了动叶片翼型出口角，从而改善泵内流场。研究结果表明，铅铋泵叶片型线出口附近角度变化过快会导致叶片压力分布不均匀，产生局部高压的现象，进而可能造成更严重的冲蚀。优化导叶片厚度以及动叶片出口液流角后，泵内流场整体迹线较为平稳，导叶片出口处铅铋合金流速可以维持在1.8 m/s左右。 

Analysis and Optimization of Flow Field in an Axial Flow Lead-Bismuth Pump

The lead-bismuth main pump is the key conveying equipment of the primary circuit in a lead- bismuth cooled fast reactor, and its safe operation is essential to the safety of the lead- bismuth cooled fast reactor. The flow characteristics of liquid lead-bismuth alloy in the pump have an important impact on the long-term safe operation of the pump. In order to study the flow field in an axial flow lead-bismuth pump, the impeller model of the main pump is constructed through Workbench/BladeGen software, and the flow field in the pump is simulated and analyzed in ANSYS CFX software. According to the numerical simulation results, the thickness of the guide vane is improved, and the wing outlet angle of the moving vane is optimized, thereby improving the flow field in the pump. The research results show that too fast angle change near the vane pattern outlet of lead- bismuth pump will lead to uneven vane pressure distribution and local high pressure, which may lead to more serious erosion. After optimizing the thickness of the guide vanes and the outlet flow angle of the moving vane, the overall trace of the flow field in the pump is relatively stable and the flow velocity of lead- bismuth at the exit of the guide vane maintained at about 1.8 m/s.