摘要
选取一典型井用混流式潜水泵作为研究对象,借助数值模拟和试验测量的方法研究导叶叶片数对井用潜水泵性能的影响。在导叶叶片型线不变的情况下,通过调整叶片数6、7、8共3个方案进行数值模拟。以单级泵模型建立计算域,划分高密度结构化网格,通过网格无关性分析确定了合适的网格划分方案。基于SST k-ω湍流模型和标准壁面函数进行多工况数值模拟,对不同叶片数方案的泵性能预测结果进行了对比。证实在小流量工况下,叶片数的增加提高了导叶叶片流道内整流效果,泵的扬程随叶片数的增加而提高。然而在大流量工况下,过多的叶片会占据更多的流道面积,并产生较大的水力损失。7叶片方案的进口面积与叶轮出口面积匹配较好,水力损失较小。将7叶片方案进行了加工制造和样机性能试验,试验结果表明模型泵性能优秀,高效区宽且具有无过载特性。数值模拟预测的扬程和功率均略高于试验结果,预测的泵效率与试验值基本一致,两者随流量变化的整体趋势基本一致,证实本文数值模拟具有一定的精度。
Diffuser is one of the most critical flow components in submersible well pump,its hydraulic design has an important influence on the pump performance. A typical submersible well pump was chosen as the research object to study the influence of space diffuser vane number on the performance of submersible well pump by means of numerical simulation and experimental test methods. Based on the same curve profile,the diffuser vane number was adjusted to 6,7,8. The calculation domain was created based on single stage pump model,which was meshed with the high density of structured grids.Grid independence analysis was processed to determine the proper meshing scheme. The numerical simulations under multi-conditions were performed based on SST k-ω turbulence and standard wall function. Through the comparisons of predicted pump performance,it is found that the pump head is increasing with the increase of vane number under small flow rates. However,too many vanes occupy more passage area,which led to blockings and more hydraulic losses under larger flow rates. The scheme of 7 diffuser vanes matches the impeller very well,its import area tallies with the impeller outlet area and less hydraulic losses. The test results that this scheme has an pump performance,both the single-stage head and efficiency are higher than the national standard,which successfully completes the expected design goal. The head and power of numerical simulation prediction are slightly higher than the test results,the predicted pump efficiency is slightly higher than the test results,but the change trend isalmost same with each other. The results of this study provide basis and reference for the improvement of submersible well pump performance.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2016年第10期78-84,共7页
Transactions of the Chinese Society for Agricultural Machinery
基金
江苏省自然科学基金青年基金项目(BK20150508)
江苏省高校自然科学研究面上项目(15KJB570001)
江苏省博士后科研计划项目(1501069A)
中国博士后科学基金项目(2015M581737)
流体及动力机械教育部重点实验室(西华大学)开放课题项目(szjj2015-023)
江苏大学高级人才启动基金项目(15JDG047)
关键词
井用潜水泵
空间导叶
水力损失
数值模拟
试验
submersible well pump
space diffuser
hydraulic losses
numerical simulation
experiment
