全贯流泵流动特性数值模拟和性能预测

为研究全贯流泵(电机泵)的性能，采用CFD软件对全贯流泵模型装置进行三维流动数值模拟，分析了全贯流泵内部流态和整体性能。结果表明：全贯流泵模型装置在各个工况下前导叶进口流速均匀度均在97%以上、叶轮进口流速均匀度均在91%以上，均匀度足以保证水泵性能。进水喇叭管、前导叶水力损失小，后导叶、出水喇叭管水力损失大。出水喇叭管出口断面流速分布不均匀，流态差。该装置最高效率为69.47%，对应工况流量为290 L/s时，扬程为4.855 m。在各个工况下,全贯流泵模型装置扬程比对照轴流泵装置扬程小，效率比对照轴流泵装置效率低，消耗的轴功率比对照轴流泵装置消耗的轴功率多。全贯流泵管路短，出水喇叭管出口流速大，扩散不充分，水力损失大，这是全贯流泵装置效率低的主要原因。 In order to study the performance of the full-flow pump (motor-pump),we used the CFD software to simulate the three-dimensional flow of the motor-pump model system,and analyzed the internal flow state and overall performance of the motor-pump.The results showed that in all working conditions,the front guide vane inlet flow rate uniformity of the motor-pump is above 97%,and the uniformity of the impeller inlet flow rate is above 91%.The uniformity is enough to ensure pump performance.The hydraulic loss of the inlet flare tube and the front guide vane is low,while that of the back guide vane and the outlet flare tube is relatively high.The outlet velocity of the outlet flare tube is unevenly distributed with a poor flow state.The maximum efficiency of the system is 69.47%,and the head is 4.855 m when the flow rate is 290 L/s.In all working conditions,the head of the motor-pump system is smaller than the head of the contrasting axial-flow pump system,and the former′s efficiency is lower than the latter′s.The shaft power consumed by the motor-pump system is more than that consumed by the contrasting axial-flow pump system.The motor-pump has short pipelines,large outlet flow velocity,insufficient diffusion,and large hydraulic loss.These are the main reasons why the motor-pump system has low efficiency. 国家自然科学基金(51279173)；江苏省水利科技项目(2017031)；调水工程建设运行管理关键技术研究(SDSLKY201705)；江苏高校优势学科建设工程资助项目(PAPD)