低比转数混流泵导叶内部压力脉动特性研究  

Internal Pressure Fluctuation Characteristic of Low Specific Speed Mixed Flow Pump

作　　者：翟杰[1,2] 祝宝山[1,2] 李凯 王旭鹤[1,2] 曹树良[1,2] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084 [2]清华大学热能工程系,北京100084 [3]中船重工集团特种设备有限责任公司,武汉430064

出　　处：《农业机械学报》2016年第6期42-46,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金项目(51179090);清华大学自主科研计划项目(2011THZ0)

摘　　要：对一比转数为148.8的设计混流泵进行试验和数值模拟研究,比较不同流量工况下混流泵性能的试验与数值计算结果,两者吻合较好。在流场内部设置监测点,捕捉压力脉动由动静干涉无叶区向导叶出口的发展过程。分析不同工况下的混流泵各测点的压力脉动,发现导叶内部各测点压力脉动主要受叶轮转动影响,主频为叶频;由动静干涉的无叶区到导叶出口,平均压力逐渐增大,而压力脉动的幅值强度越来越弱;非设计工况下的压力脉动变化更复杂。上述结果可为混流泵进一步的优化设计提供参考。Experiment and numerical simulation research were conducted on a designed mixed flow pump with the low specific speed of 148. 8. By comparing the mixed-flow pump performances at different flow rates,the numerical results and the test results were in good agreement. Monitoring points in the internal flow field were set to capture the pressure fluctuations from rotor-stator interface to the guide vane exit in both the experiment and the numerical simulation. Through analyzing the pressure fluctuations of mixed flow pump at the different flow rates,the pressure fluctuations in guide vane were mainly affected by impeller rotation,and the frequency was impeller blade frequency. From rotor-stator interface to the guide vane exit,the average pressure was increased gradually,and the amplitude of pressure fluctuations gradually became weaker. At the off-design points,the pressure fluctuations became more complex. At low flow rate,there were many low frequencies of the vortex fluctuation with low amplitude,which was consistent with flow field in the test. At high flow rate,the main frequency was also the impeller blade frequency,and there were some low frequencies of the vortex fluctuation with low amplitude,which were better than the low flow rate. These results can be useful for further optimization design of mixed flow pump.

关 键 词：低比转数混流泵 叶片扩压器 压力脉动 数值模拟 

分 类 号：S277.9[农业科学—农业水土工程] TH311[农业科学—农业工程]