| 引用本文: | 孙会明,秦永法,刘爱明,等.混流泵出水歧管流场分析及结构改进[J].灌溉排水学报,2017,36(5):. |
| SUN Huiming,QIN Yongfa,LIU Aiming,et al.混流泵出水歧管流场分析及结构改进[J].灌溉排水学报,2017,36(5):. |
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| 摘要: |
| 针对排灌作业混流泵出水歧管头部涡旋严重，歧管侧面出水流道内存在较为严重的涡旋及局部脱流问题，提出了相应的结构改进方案，以提高侧面出口断面速度分布均匀性、减小流道的水力损失为目标，将建立的参数化三维模型导入至IECM中完成网格的划分，利用CFD三维湍流数值模型进行有限体积法分析，逐步改进出水歧管流道的结构。结果表明，管道的连接圆滑过渡程度、岔管的夹角会影响流场的分布，通过这2个关键因素的改进来提高出水歧管的流道性能，从而减小水力损失。 |
| 关键词: 出水歧管；出水流道；流场分析；结构改进；数值模拟 |
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| Analyzing Water Flowin Manifold of Mixing-flow Pump and the Method to Improve Its Structure |
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SUN Huiming， QIN Yongfa， LIU Aiming， ZHANG Chun， ZHU Hao， ZHOU Lin
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College of mechanical Engineering，Yangzhou University， Yangzhou 225127， China；Flood prevention and drought relief command center， Nanjing 211500， China
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| Abstract: |
| This paper proposed a methodto modify the structure of mixing-flow pump so as to resolve the problem of formation of vortex near the headof its manifold and partial desorption from the outlet of its manifold in attempts to improve flow-distribution uniformity and reduce hydraulic head loss. The three-dimensional structure of the manifold was first discretized into grid network using IECM, and the turbulent water flow through it was then simulated using CFD model; the simulated results were used to help improve manifold structure. The results showed that a smooth transition between the connection pipe and the angle of branch pipe influences the distribution of water flow field, and modifying their designs could improve the flow field in the outlet of the manifold and reduce hydraulic head loss. |
| Key words: outlet manifold； outlet conduit；flow field analysis； structure improvement； numerical simulation |
