摘要
多级深井离心泵在机井内工作,其外径受井径的限制,最大流量也受限制.为了提高泵的水力效率,最大限度增大其单级扬程,以100QJ10型深井泵为例,建立连续方程、动量方程,并采用标准k-ε双方程湍流模型,应用全隐式多网格耦合算法,对5种叶轮出口边斜度10°,15°,20°,25°,30°进行全流道内部流场的三维不可压缩稳态黏性湍流流场的数值模拟,并比较分析其在相同工况下的水力性能、内部流场湍动能、速度场、压力分布等,寻找最优的叶轮出口边斜度.研究结果表明:随着斜切角度的增大,泵的效率和单级扬程呈现出先增大后减小的趋势,其单级扬程在较小的叶轮斜切角时最高,水泵效率在较大的叶轮斜切角时最高;综合分析,20°被认为综合性能指标最优叶轮出口斜度.计算结果与样机试验结果基本吻合,新研制的100QJ10的多级深井离心泵效率为58.9%,比同类产品效率高出5.9%.
Since a deep well multistage centrifugal pump has to work in a well,its impeller diameter and maximum discharge are restricted by the borehole diameter. In order to improve the pump hydraulic efficiency,its single-stage head must be the highest. In doing so,the sloping angle of the impeller outlet edge of 100QJ10 deep well multistage centrifugal pump was designed to be 10°,15°,20°,25° and 30°,respectively. Then the steady,three-dimensional,incompressible turbulent flows of water in one stage of the pump were simulated based on the RANS equations and standard turbulence model by using a CFD code. The performance,turbulent kinetic energy,velocity and pressure fields were compared among the different impeller structures at the same discharge for an optimal sloping angle to be explored. The results show that the hydraulic efficiency and single stage head are maximum at two different sloping angles; this means the angle for the highest head is lower than that for the best efficiency. For a compromise,the optimal sloping angle should be 20°. Further,the predicted performance is in good agreement with the tested one. It was confirmed that the best overall efficiency of the pump redesigned with the impeller of 20° outlet edge sloping angle is as high as 58. 9%,a 5. 9% incrementhas been achieved compared with the original pumps.
出处
《排灌机械工程学报》
EI
北大核心
2014年第3期214-219,共6页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家火炬计划产业化示范项目(2012GH050632)
关键词
深井离心泵
水力设计
叶轮出口边
内部流场
deep-well centrifugal pump
hydraulic design
impeller outlet oblique edge
internal flow field
